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Message-ID: <45835a92-55a1-6637-183a-4ecad79d9065@linaro.org>
Date: Wed, 22 Mar 2023 14:51:32 -0300
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Subject: Re: [PATCH 1/2] elf: Remove glibc.rtld.dynamic_sort tunable
Content-Language: en-US
To: Siddhesh Poyarekar <siddhesh@gotplt.org>, libc-alpha@sourceware.org,
 Florian Weimer <fweimer@redhat.com>
References: <20230313190627.2000578-1-adhemerval.zanella@linaro.org>
 <20230313190627.2000578-2-adhemerval.zanella@linaro.org>
 <a001935c-2655-df8c-4d72-b53f06b150c4@gotplt.org>
From: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Organization: Linaro
In-Reply-To: <a001935c-2655-df8c-4d72-b53f06b150c4@gotplt.org>
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On 22/03/23 14:08, Siddhesh Poyarekar wrote:
> On 2023-03-13 15:06, Adhemerval Zanella wrote:
>> And make the DFS algorithm (added on 2.35) the de-facto implementation=
=2E
>=20
> Isn't this orthogonal to the proposal to remove --enable-tunables?

Yes, the DFS is already the default one.  I meant that now there is no wa=
y to
select the one algorithm.  Maybe use the commit messagE:

  And make the old sort algorithm no longer available.

>=20
> Thanks,
> Sid
>=20
>> ---
>> =C2=A0 elf/dl-sort-maps.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 139 +--------=
-------------------
>> =C2=A0 elf/dl-tunables.list=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0 9 --
>> =C2=A0 elf/dso-sort-tests-1.def=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 15 +--
>> =C2=A0 elf/dso-sort-tests-2.def=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 10 +-
>> =C2=A0 elf/tst-rtld-list-tunables.exp=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=
=A0=C2=A0 1 -
>> =C2=A0 manual/tunables.texi=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 13 ---
>> =C2=A0 sysdeps/mach/hurd/dl-sysdep.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 |=C2=A0=C2=A0 3 -
>> =C2=A0 sysdeps/unix/sysv/linux/dl-sysdep.c |=C2=A0=C2=A0 3 -
>> =C2=A0 8 files changed, 8 insertions(+), 185 deletions(-)
>>
>> diff --git a/elf/dl-sort-maps.c b/elf/dl-sort-maps.c
>> index 325e96388e..72ca5cec33 100644
>> --- a/elf/dl-sort-maps.c
>> +++ b/elf/dl-sort-maps.c
>> @@ -20,112 +20,6 @@
>> =C2=A0 #include <ldsodefs.h>
>> =C2=A0 #include <elf/dl-tunables.h>
>> =C2=A0 -/* Note: this is the older, "original" sorting algorithm, bein=
g used as
>> -=C2=A0=C2=A0 default up to 2.35.
>> -
>> -=C2=A0=C2=A0 Sort array MAPS according to dependencies of the contain=
ed objects.
>> -=C2=A0=C2=A0 If FOR_FINI is true, this is called for finishing an obj=
ect.=C2=A0 */
>> -static void
>> -_dl_sort_maps_original (struct link_map **maps, unsigned int nmaps,
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 bo=
ol force_first, bool for_fini)
>> -{
>> -=C2=A0 /* Allows caller to do the common optimization of skipping the=
 first map,
>> -=C2=A0=C2=A0=C2=A0=C2=A0 usually the main binary.=C2=A0 */
>> -=C2=A0 maps +=3D force_first;
>> -=C2=A0 nmaps -=3D force_first;
>> -
>> -=C2=A0 /* A list of one element need not be sorted.=C2=A0 */
>> -=C2=A0 if (nmaps <=3D 1)
>> -=C2=A0=C2=A0=C2=A0 return;
>> -
>> -=C2=A0 unsigned int i =3D 0;
>> -=C2=A0 uint16_t seen[nmaps];
>> -=C2=A0 memset (seen, 0, nmaps * sizeof (seen[0]));
>> -=C2=A0 while (1)
>> -=C2=A0=C2=A0=C2=A0 {
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Keep track of which object we looke=
d at this round.=C2=A0 */
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ++seen[i];
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct link_map *thisp =3D maps[i];
>> -
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (__glibc_unlikely (for_fini))
>> -=C2=A0=C2=A0=C2=A0 {
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Do not handle ld.so in secondary na=
mespaces and objects which
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 are not removed.=C2=A0=
 */
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (thisp !=3D thisp->l_real || thisp-=
>l_idx =3D=3D -1)
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 goto skip;
>> -=C2=A0=C2=A0=C2=A0 }
>> -
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Find the last object in the list fo=
r which the current one is
>> -=C2=A0=C2=A0=C2=A0=C2=A0 a dependency and move the current object beh=
ind the object
>> -=C2=A0=C2=A0=C2=A0=C2=A0 with the dependency.=C2=A0 */
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unsigned int k =3D nmaps - 1;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 while (k > i)
>> -=C2=A0=C2=A0=C2=A0 {
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct link_map **runp =3D maps[k]->l_=
initfini;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (runp !=3D NULL)
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Look through the depend=
encies of the object.=C2=A0 */
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 while (*runp !=3D NULL)
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (__glibc_un=
likely (*runp++ =3D=3D thisp))
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 move:
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Move the cu=
rrent object to the back past the last
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 object with it as the dependency.=C2=A0 */
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 memmove (&maps=
[i], &maps[i + 1],
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 (k - i) * sizeof (maps[0]));
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 maps[k] =3D th=
isp;
>> -
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (seen[i + 1=
] > nmaps - i)
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 ++i;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 goto next_clear;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>> -
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 uint16_t this_=
seen =3D seen[i];
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 memmove (&seen=
[i], &seen[i + 1], (k - i) * sizeof (seen[0]));
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 seen[k] =3D th=
is_seen;
>> -
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 goto next;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>> -
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (__glibc_unlikely (for_fini && maps=
[k]->l_reldeps !=3D NULL))
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unsigned int m=
 =3D maps[k]->l_reldeps->act;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct link_ma=
p **relmaps =3D &maps[k]->l_reldeps->list[0];
>> -
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Look throug=
h the relocation dependencies of the object.=C2=A0 */
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 while (m-- > 0=
)
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (__glibc_unlikely (relm=
aps[m] =3D=3D thisp))
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /*=
 If a cycle exists with a link time dependency,
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 preserve the latter.=C2=A0 */
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 st=
ruct link_map **runp =3D thisp->l_initfini;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if=
 (runp !=3D NULL)
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 while (*runp !=3D NULL)
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if=
 (__glibc_unlikely (*runp++ =3D=3D maps[k]))
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 goto ignore;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 go=
to move;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ignore:;
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>> -
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 --k;
>> -=C2=A0=C2=A0=C2=A0 }
>> -
>> -=C2=A0=C2=A0=C2=A0 skip:
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (++i =3D=3D nmaps)
>> -=C2=A0=C2=A0=C2=A0 break;
>> -=C2=A0=C2=A0=C2=A0 next_clear:
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 memset (&seen[i], 0, (nmaps - i) * siz=
eof (seen[0]));
>> -
>> -=C2=A0=C2=A0=C2=A0 next:;
>> -=C2=A0=C2=A0=C2=A0 }
>> -}
>> -
>> -#if !HAVE_TUNABLES
>> -/* In this case, just default to the original algorithm.=C2=A0 */
>> -strong_alias (_dl_sort_maps_original, _dl_sort_maps);
>> -#else
>> -
>> =C2=A0 /* We use a recursive function due to its better clarity and ea=
se of
>> =C2=A0=C2=A0=C2=A0=C2=A0 implementation, as well as faster execution s=
peed. We already use
>> =C2=A0=C2=A0=C2=A0=C2=A0 alloca() for list allocation during the bread=
th-first search of
>> @@ -180,9 +74,9 @@ dfs_traversal (struct link_map ***rpo, struct link_=
map *map,
>> =C2=A0 /* Topologically sort array MAPS according to dependencies of t=
he contained
>> =C2=A0=C2=A0=C2=A0=C2=A0 objects.=C2=A0 */
>> =C2=A0 -static void
>> -_dl_sort_maps_dfs (struct link_map **maps, unsigned int nmaps,
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 bool for=
ce_first, bool for_fini)
>> +void
>> +_dl_sort_maps (struct link_map **maps, unsigned int nmaps, bool force=
_first,
>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 bool for=
_fini)
>> =C2=A0 {
>> =C2=A0=C2=A0=C2=A0 struct link_map *first_map =3D maps[0];
>> =C2=A0=C2=A0=C2=A0 for (int i =3D nmaps - 1; i >=3D 0; i--)
>> @@ -289,30 +183,3 @@ _dl_sort_maps_dfs (struct link_map **maps, unsign=
ed int nmaps,
>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 maps[0] =3D first_map;
>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>> =C2=A0 }
>> -
>> -void
>> -_dl_sort_maps_init (void)
>> -{
>> -=C2=A0 int32_t algorithm =3D TUNABLE_GET (glibc, rtld, dynamic_sort, =
int32_t, NULL);
>> -=C2=A0 GLRO(dl_dso_sort_algo) =3D algorithm =3D=3D 1 ? dso_sort_algor=
ithm_original
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 : dso_sort_algo=
rithm_dfs;
>> -}
>> -
>> -void
>> -_dl_sort_maps (struct link_map **maps, unsigned int nmaps,
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 bool for=
ce_first, bool for_fini)
>> -{
>> -=C2=A0 /* It can be tempting to use a static function pointer to stor=
e and call
>> -=C2=A0=C2=A0=C2=A0=C2=A0 the current selected sorting algorithm routi=
ne, but experimentation
>> -=C2=A0=C2=A0=C2=A0=C2=A0 shows that current processors still do not h=
andle indirect branches
>> -=C2=A0=C2=A0=C2=A0=C2=A0 that efficiently, plus a static function poi=
nter will involve
>> -=C2=A0=C2=A0=C2=A0=C2=A0 PTR_MANGLE/DEMANGLE, further impairing perfo=
rmance of small, common
>> -=C2=A0=C2=A0=C2=A0=C2=A0 input cases. A simple if-case with direct fu=
nction calls appears to
>> -=C2=A0=C2=A0=C2=A0=C2=A0 be the fastest.=C2=A0 */
>> -=C2=A0 if (__glibc_likely (GLRO(dl_dso_sort_algo) =3D=3D dso_sort_alg=
orithm_original))
>> -=C2=A0=C2=A0=C2=A0 _dl_sort_maps_original (maps, nmaps, force_first, =
for_fini);
>> -=C2=A0 else
>> -=C2=A0=C2=A0=C2=A0 _dl_sort_maps_dfs (maps, nmaps, force_first, for_f=
ini);
>> -}
>> -
>> -#endif /* HAVE_TUNABLES.=C2=A0 */
>> diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list
>> index 695ba7192e..b9fa831000 100644
>> --- a/elf/dl-tunables.list
>> +++ b/elf/dl-tunables.list
>> @@ -162,15 +162,6 @@ glibc {
>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>> =C2=A0=C2=A0=C2=A0 }
>> =C2=A0 -=C2=A0 rtld {
>> -=C2=A0=C2=A0=C2=A0 dynamic_sort {
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 type: INT_32
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 minval: 1
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 maxval: 2
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 default: 2
>> -=C2=A0=C2=A0=C2=A0 }
>> -=C2=A0 }
>> -
>> =C2=A0=C2=A0=C2=A0 gmon {
>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 minarcs {
>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 type: INT_32
>> diff --git a/elf/dso-sort-tests-1.def b/elf/dso-sort-tests-1.def
>> index 4bf9052db1..f5afd003d8 100644
>> --- a/elf/dso-sort-tests-1.def
>> +++ b/elf/dso-sort-tests-1.def
>> @@ -2,10 +2,6 @@
>> =C2=A0 # This file is to be processed by ../scripts/dso-ordering-test.=
py, see usage
>> =C2=A0 # in elf/Makefile for how it is executed.
>> =C2=A0 -# We test both dynamic loader sorting algorithms
>> -tunable_option: glibc.rtld.dynamic_sort=3D1
>> -tunable_option: glibc.rtld.dynamic_sort=3D2
>> -
>> =C2=A0 # Sequence of single dependencies with no cycles.
>> =C2=A0 tst-dso-ordering1: a->b->c
>> =C2=A0 output: c>b>a>{}<a<b<c
>> @@ -56,18 +52,15 @@ output: b>a>{}<a<b
>> =C2=A0 # relocation(dynamic) dependencies. While this is technically u=
nspecified, the
>> =C2=A0 # presumed reasonable practical behavior is for the destructor =
order to respect
>> =C2=A0 # the static DT_NEEDED links (here this means the a->b->c->d or=
der).
>> -# The older dynamic_sort=3D1 algorithm does not achieve this, while t=
he DFS-based
>> -# dynamic_sort=3D2 algorithm does, although it is still arguable whet=
her going
>> -# beyond spec to do this is the right thing to do.
>> +# The DFS-based sorting algorithm does it, although it is still argua=
ble whether
>> +# going beyond spec to do this is the right thing to do.
>> =C2=A0 # The below expected outputs are what the two algorithms curren=
tly produce
>> =C2=A0 # respectively, for regression testing purposes.
>> =C2=A0 tst-bz15311: {+a;+e;+f;+g;+d;%d;-d;-g;-f;-e;-a};a->b->c->d;d=3D=
>[ba];c=3D>a;b=3D>e=3D>a;c=3D>f=3D>b;d=3D>g=3D>c
>> -output(glibc.rtld.dynamic_sort=3D1): {+a[d>c>b>a>];+e[e>];+f[f>];+g[g=
>];+d[];%d(b(e(a()))a()g(c(a()f(b(e(a()))))));-d[];-g[];-f[];-e[];-a[<a<c=
<d<g<f<b<e];}
>> -output(glibc.rtld.dynamic_sort=3D2): {+a[d>c>b>a>];+e[e>];+f[f>];+g[g=
>];+d[];%d(b(e(a()))a()g(c(a()f(b(e(a()))))));-d[];-g[];-f[];-e[];-a[<g<f=
<a<b<c<d<e];}
>> +output: {+a[d>c>b>a>];+e[e>];+f[f>];+g[g>];+d[];%d(b(e(a()))a()g(c(a(=
)f(b(e(a()))))));-d[];-g[];-f[];-e[];-a[<g<f<a<b<c<d<e];}
>> =C2=A0 =C2=A0 # Test that even in the presence of dependency loops inv=
olving dlopen'ed
>> =C2=A0 # object, that object is initialized last (and not unloaded pre=
maturely).
>> =C2=A0 # Final destructor order is indeterminate due to the cycle.
>> =C2=A0 tst-bz28937: {+a;+b;-b;+c;%c};a->a1;a->a2;a2->a;b->b1;c->a1;c=3D=
>a1
>> -output(glibc.rtld.dynamic_sort=3D1): {+a[a2>a1>a>];+b[b1>b>];-b[<b<b1=
];+c[c>];%c(a1());}<a<a2<c<a1
>> -output(glibc.rtld.dynamic_sort=3D2): {+a[a2>a1>a>];+b[b1>b>];-b[<b<b1=
];+c[c>];%c(a1());}<a2<a<c<a1
>> +output: {+a[a2>a1>a>];+b[b1>b>];-b[<b<b1];+c[c>];%c(a1());}<a2<a<c<a1=

>> diff --git a/elf/dso-sort-tests-2.def b/elf/dso-sort-tests-2.def
>> index b79e79ecb7..183d311fba 100644
>> --- a/elf/dso-sort-tests-2.def
>> +++ b/elf/dso-sort-tests-2.def
>> @@ -1,11 +1,4 @@
>> =C2=A0 # Large DSO sorting testcase adapted from Red Hat Bugzilla 1162=
810
>> -#
>> -# Note that below we specify different expected outputs between dynam=
ic_sort=3D1
>> -# and dynamic_sort=3D2 algorithms, due to circular dependencies in th=
e testcase
>> -# causing different sorting behavior.=C2=A0 These expected outputs ar=
e what the two
>> -# algorithms currently produce, and are used for regression compariso=
n tests.
>> -# They are not "definitively" correct outputs, for circular dependenc=
ies
>> -# inherently have unspecified behavior.
>> =C2=A0 =C2=A0 xtest(tst-redhat-1162810):
>> =C2=A0 {}->A101
>> @@ -610,5 +603,4 @@ M30X22
>> =C2=A0 M30X23
>> =C2=A0 M30X24
>> =C2=A0 M30X25
>> -xfail_output(glibc.rtld.dynamic_sort=3D1):
>> M30X19>M30X15>M30X16>M30X11>M30X12>M30X17>M30X13>M30X14>M29X20>M30X23>=
M30X24>M30X20>M30X18>M29X15>M29X12>M30X22>M30X21>M29X22>M30X25>M29X19>M29=
X23>M29X16>M29X24>M29X13>M29X17>M29X18>M28X19>M29X21>M29X25>M29X14>M28X20=
>M28X15>M28X16>M28X21>M27X18>M29X11>M28X17>M28X11>M28X22>M27X14>M28X18>M2=
7X15>M28X13>M27X11>M28X23>M27X25>M28X14>M28X25>M27X23>M27X22>M28X24>M27X2=
1>M27X13>M27X19>M27X17>M26X11>M26X23>M26X21>M26X22>M26X20>M26X16>M25X21>M=
17X22>M15X15>M20X14>M20X16>M18X18>M28X12>M27X24>M25X17>M27X20>M26X18>M26X=
17>M27X16>M26X19>M25X18>M26X24>M25X20>M24X17>M23X18>M25X13>M26X13>M17X23>=
M16X16>M26X12>M25X12>M26X15>M24X19>M25X23>M25X24>M25X25>M24X20>M25X19>M24=
X21>M23X17>M22X21>M24X14>M23X22>M24X24>M22X20>M24X13>M25X11>M24X12>M25X15=
>M23X15>M25X16>M24X22>M23X13>M24X18>M23X14>M22X22>M21X20>M24X25>M23X16>M2=
2X25>M21X19>M22X14>M23X11>M22X15>M21X18>M22X19>M21X17>M20X17>M19X17>M21X2=
4>M21X12>M20X22>M19X16>M18X25>M19X21>M19X20>M18X24>M20X12>M19X11>M23X20>M=
22X24>M22X16>M21X21>M25X14>M23X19>M23X24>M20X24>M19X12>M18X15>M17X14>M16X=
18>M14X25>M16X22>M16X20>M17X17>M22X12>M21X11>M20X15>M18X22>M19X24>M19X18>=
M18X21>M17X16>M17X18>M16X21>M15X20>M19X22>M18X20>M18X11>M17X19>M16X17>M15=
X21>M16X14>M16X13>M15X22>M14X20>M17X25>M16X19>M14X21>M13X24>M12X12>M16X24=
>M15X23>M14X16>M16X15>M15X25>M15X11>M15X12>M14X15>M13X14>M14X22>M13X20>M1=
2X13>M11X11>M22X23>M21X15>M21X16>M20X21>M20X20>M18X17>M19X25>M18X23>M21X1=
3>M15X17>M15X18>M18X19>M17X24>M16X12>M17X13>M20X25>M19X23>M15X19>M14X13>M=
13X18>M15X13>M17X12>M16X11>M18X13>M18X12>M14X11>M14X24>M13X19>M15X14>M17X=
20>M20X11>M20X13>M21X14>M15X24>M14X12>M13X22>M14X23>M13X23>M14X19>M17X15>=
M16X25>M17X11>M18X14>M19X19>M21X25>M13X12>M13X11>M14X18>M13X13>M12X11>M15=
X16>M14X14>M27X12>M17X21>M20X23>M22X13>M21X22>M24X16>M24X15>M26X25>M23X25=
>M26X14>M23X12>M22X18>M24X11>M16X23>M19X14>M19X13>M21X23>M22X17>M23X23>M2=
3X21>M25X22>M18X16>M19X15>M20X18>M20X19>M22X11>M24X23>C156>C118>C143>C137=
>C147>C106>C168>C113>C163>C155>C105>C146>C187>A150>C139>C180>C164>C193>C1=
57>A191>C158>B188>A159>C184>C121>C154>B171>A105>C131>C104>B104>C161>C111>=
B145>C160>B155>A163>C112>C142>B148>C133>B198>A198>A115>C114>B157>A156>C17=
5>B144>A120>C173>B184>A174>C126>B107>A139>C194>B194>A194>C116>B116>C166>B=
160>B110>A110>C128>B128>A128>C179>B162>A154>C186>B187>A179>C124>B181>A101=
>C153>B158>A136>C135>C176>A192>B133>A133>C177>B177>A177>C185>C103>B141>A1=
41>C183>A162>C192>C129>B179>C144>B124>B183>C127>B127>A127>B108>A112>B153>=
A153>C167>B167>A186>A122>C162>A144>B149>C174>B131>A185>C141>B106>A126>A16=
7>C140>B122>A170>C198>B143>C117>C123>B123>A147>A106>C200>B169>C191>B175>A=
123>B118>A182>C132>B151>A145>A104>A109>C159>C150>B119>A119>A178>B164>B114=
>A164>C181>A102>C122>B134>A157>A116>C195>B191>B111>C172>B172>A118>B129>A1=
29>C149>A107>C170>B197>A197>A173>B168>A132>C107>B165>A160>A131>C188>A168>=
B109>C178>A189>A148>C119>C190>C120>B166>B176>C108>B135>B139>A103>B178>A16=
9>B132>C125>C138>B163>A111>B170>C110>A165>C151>C169>C199>A138>C182>A135>B=
101>B142>C101>C148>B193>B152>A158>A199>C136>B137>A161>B120>A108>A149>A125=
>B113>A184>C171>A134>A175>A124>B150>B161>B102>A146>A187>C130>B192>B200>A2=
00>A142>A183>C102>B105>B156>A176>C165>B147>A137>A196>B190>A190>B125>C134>=
C189>B126>B186>A166>B136>B195>A195>B154>B138>B112>B173>A117>B159>B182>A18=
1>A140>C145>B117>A152>A193>C197>B130>A172>A113>A151>B115>A143>B140>B185>B=
103>A121>A180>A130>A171>B199>C196>B146>B180>C115>B174>B121>A188>B196>B189=
>C152>C109>A155>A114>M14X17>M13X15>M13X16>M13X17>M12X17>M12X21>M12X25>M12=
X14>M13X25>M12X15>M13X21>M12X16>M12X18>M12X19>M12X20>M12X22>M12X23>M12X24=
>M11X25>M11X24>M11X23>M11X22>M11X21>M11X20>M11X19>M11X18>M11X17>M11X16>M1=
1X15>M11X14>M11X13>M11X12>{}<M11X12<M11X13<M11X14<M11X15<M11X16<M11X17<M1=
1X18<M11X19<M11X20<M11X21<M11X22<M11X23<M11X24<M11X25<M12X24<M12X23<M12X2=
2<M12X20<M12X19<M12X18<M12X16<M13X21<M12X15<M13X25<M12X14<M12X25<M12X21<M=
12X17<M13X17<M13X16<M13X15<M14X17<A114<A155<C109<C152<B189<B196<A188<B121=
<B174<C115<B180<B146<C196<B199<A171<A130<A180<A121<B103<B185<B140<A143<B1=
15<A151<A113<A172<B130<C197<A193<A152<B117<C145<A140<A181<B182<B159<A117<=
B173<B112<B138<B154<A195<B195<B136<A166<B186<B126<C189<C134<B125<A190<B19=
0<A196<A137<B147<C165<A176<B156<B105<C102<A183<A142<A200<B200<B192<C130<A=
187<A146<B102<B161<B150<A124<A175<A134<C171<A184<B113<A125<A149<A108<B120=
<A161<B137<C136<A199<A158<B152<B193<C148<C101<B142<B101<A135<C182<A138<C1=
99<C169<C151<A165<C110<B170<A111<B163<C138<C125<B132<A169<B178<A103<B139<=
B135<C108<B176<B166<C120<C190<C119<A148<A189<C178<B109<A168<C188<A131<A16=
0<B165<C107<A132<B168<A173<A197<B197<C170<A107<C149<A129<B129<A118<B172<C=
172<B111<B191<C195<A116<A157<B134<C122<A102<C181<A164<B114<B164<A178<A119=
<B119<C150<C159<A109<A104<A145<B151<C132<A182<B118<A123<B175<C191<B169<C2=
00<A106<A147<B123<C123<C117<B143<C198<A170<B122<C140<A167<A126<B106<C141<=
A185<B131<C174<B149<A144<C162<A122<A186<B167<C167<A153<B153<A112<B108<A12=
7<B127<C127<B183<B124<C144<B179<C129<C192<A162<C183<A141<B141<C103<C185<A=
177<B177<C177<A133<B133<A192<C176<C135<A136<B158<C153<A101<B181<C124<A179=
<B187<C186<A154<B162<C179<A128<B128<C128<A110<B110<B160<C166<B116<C116<A1=
94<B194<C194<A139<B107<C126<A174<B184<C173<A120<B144<C175<A156<B157<C114<=
A115<A198<B198<C133<B148<C142<C112<A163<B155<C160<B145<C111<C161<B104<C10=
4<C131<A105<B171<C154<C121<C184<A159<B188<C158<A191<C157<C193<C164<C180<C=
139<A150<C187<C146<C105<C155<C163<C113<C168<C106<C147<C137<C143<C118<C156=
<M24X23<M22X11<M20X19<M20X18<M19X15<M18X16<M25X22<M23X21<M23X23<M22X17<M2=
1X23<M19X13<M19X14<M16X23<M24X11<M22X18<M23X12<M26X14<M23X25<M26X25<M24X1=
5<M24X16<M21X22<M22X13<M20X23<M17X21<M27X12<M14X14<M15X16<M12X11<M13X13<M=
14X18<M13X11<M13X12<M21X25<M19X19<M18X14<M17X11<M16X25<M17X15<M14X19<M13X=
23<M14X23<M13X22<M14X12<M15X24<M21X14<M20X13<M20X11<M17X20<M15X14<M13X19<=
M14X24<M14X11<M18X12<M18X13<M16X11<M17X12<M15X13<M13X18<M14X13<M15X19<M19=
X23<M20X25<M17X13<M16X12<M17X24<M18X19<M15X18<M15X17<M21X13<M18X23<M19X25=
<M18X17<M20X20<M20X21<M21X16<M21X15<M22X23<M11X11<M12X13<M13X20<M14X22<M1=
3X14<M14X15<M15X12<M15X11<M15X25<M16X15<M14X16<M15X23<M16X24<M12X12<M13X2=
4<M14X21<M16X19<M17X25<M14X20<M15X22<M16X13<M16X14<M15X21<M16X17<M17X19<M=
18X11<M18X20<M19X22<M15X20<M16X21<M17X18<M17X16<M18X21<M19X18<M19X24<M18X=
22<M20X15<M21X11<M22X12<M17X17<M16X20<M16X22<M14X25<M16X18<M17X14<M18X15<=
M19X12<M20X24<M23X24<M23X19<M25X14<M21X21<M22X16<M22X24<M23X20<M19X11<M20=
X12<M18X24<M19X20<M19X21<M18X25<M19X16<M20X22<M21X12<M21X24<M19X17<M20X17=
<M21X17<M22X19<M21X18<M22X15<M23X11<M22X14<M21X19<M22X25<M23X16<M24X25<M2=
1X20<M22X22<M23X14<M24X18<M23X13<M24X22<M25X16<M23X15<M25X15<M24X12<M25X1=
1<M24X13<M22X20<M24X24<M23X22<M24X14<M22X21<M23X17<M24X21<M25X19<M24X20<M=
25X25<M25X24<M25X23<M24X19<M26X15<M25X12<M26X12<M16X16<M17X23<M26X13<M25X=
13<M23X18<M24X17<M25X20<M26X24<M25X18<M26X19<M27X16<M26X17<M26X18<M27X20<=
M25X17<M27X24<M28X12<M18X18<M20X16<M20X14<M15X15<M17X22<M25X21<M26X16<M26=
X20<M26X22<M26X21<M26X23<M26X11<M27X17<M27X19<M27X13<M27X21<M28X24<M27X22=
<M27X23<M28X25<M28X14<M27X25<M28X23<M27X11<M28X13<M27X15<M28X18<M27X14<M2=
8X22<M28X11<M28X17<M29X11<M27X18<M28X21<M28X16<M28X15<M28X20<M29X14<M29X2=
5<M29X21<M28X19<M29X18<M29X17<M29X13<M29X24<M29X16<M29X23<M29X19<M30X25<M=
29X22<M30X21<M30X22<M29X12<M29X15<M30X18<M30X20<M30X24<M30X23<M29X20<M30X=
14<M30X13<M30X17<M30X12<M30X11<M30X16<M30X15<M30X19
>> -output(glibc.rtld.dynamic_sort=3D2):
>> M30X19>M30X15>M30X16>M30X11>M30X12>M30X17>M30X13>M30X14>M29X20>M30X23>=
M30X24>M30X20>M30X18>M29X15>M29X12>M30X22>M30X21>M29X22>M30X25>M29X19>M29=
X23>M29X16>M29X24>M29X13>M29X17>M29X18>M28X19>M29X21>M29X25>M29X14>M28X20=
>M28X15>M28X16>M28X21>M27X18>M29X11>M28X17>M28X11>M28X22>M28X24>M28X23>M2=
7X21>M28X13>M27X20>M27X19>M26X14>M27X25>M28X18>M27X11>M28X25>M27X24>M26X2=
4>M27X15>M27X14>M27X13>M26X23>M27X17>M26X22>M25X13>M28X14>M27X16>M26X19>M=
26X18>M27X23>M27X22>M26X17>M25X18>M26X21>M25X17>M26X20>M26X15>M26X13>M25X=
19>M24X14>M25X23>M26X11>M26X25>M25X16>M25X15>M24X22>M25X21>M25X20>M24X21>=
M25X25>M25X24>M24X20>M23X13>M22X15>M25X14>M24X19>M23X17>M24X25>M23X24>M24=
X13>M23X15>M24X18>M23X14>M22X11>M24X15>M23X22>M24X11>M23X19>M22X21>M24X24=
>M23X21>M22X20>M23X25>M22X19>M21X24>M20X23>M22X22>M25X11>M23X16>M22X18>M2=
3X20>M22X17>M21X21>M21X20>M20X24>M22X14>M22X13>M21X11>M21X17>M22X23>M21X1=
6>M20X25>M19X23>M18X16>M21X22>M20X20>M20X19>M21X13>M20X18>M19X13>M21X18>M=
20X21>M19X24>M18X12>M20X14>M20X13>M22X25>M20X12>M20X15>M19X14>M18X22>M19X=
18>M20X17>M19X17>M19X16>M18X21>M17X20>M19X19>M18X13>M17X11>M18X17>M19X25>=
M18X15>M17X25>M18X19>M17X24>M16X19>M15X17>M17X21>M16X24>M18X23>M17X16>M16=
X25>M19X15>M18X25>M17X23>M16X23>M15X23>M18X14>M17X14>M16X14>M17X18>M16X13=
>M17X22>M16X12>M15X22>M14X16>M17X12>M16X22>M15X12>M16X11>M15X11>M16X15>M1=
5X25>M14X15>M13X14>M15X18>M16X21>M15X16>M14X21>M15X14>M16X20>M15X13>M14X2=
2>M15X20>M14X20>M13X20>M14X11>M15X19>M14X24>M13X19>M14X13>M13X18>M12X13>M=
15X24>M14X23>M13X12>M14X12>M13X11>M12X11>M11X11>M21X12>M20X11>M19X11>M18X=
11>M17X15>M16X18>M14X25>M14X19>M13X24>M13X23>M13X22>M12X12>M22X12>M21X15>=
M19X22>M18X20>M16X17>M14X14>M24X12>M23X23>M22X16>M21X14>M20X22>M18X24>M16=
X16>M26X12>M24X16>M23X11>M21X23>M19X20>M17X17>M27X12>M26X16>M25X22>M24X17=
>M23X18>M21X25>M19X12>M17X19>M15X21>M14X18>M13X13>M23X12>M21X19>M19X21>M1=
7X13>M15X15>M25X12>M24X23>M22X24>M20X16>M18X18>M28X12>A150>C158>B112>A112=
>C167>B146>A146>C180>B180>A180>C143>B143>A115>C126>B126>A126>C190>B190>A1=
90>C138>B138>A138>C174>B174>A102>C122>B122>A122>C162>B162>A162>C142>B142>=
A142>C102>B102>A174>C176>B176>A176>C115>B115>A143>C172>B172>A172>C187>B18=
7>A187>C130>B130>A130>C118>B118>A118>C184>B184>A184>C171>B171>A171>C168>B=
182>A182>C182>B168>A168>C109>B109>A109>C159>B159>A159>C134>B134>A134>C146=
>B167>A167>C140>B140>A140>C163>B163>A163>C112>B158>A158>C164>B164>A164>C1=
31>B131>A131>C188>B188>A188>C199>B199>A199>C114>B114>A114>C106>B106>A106>=
C200>B200>A200>C183>B183>A183>C152>B152>A152>C147>B147>A147>C150>B150>A19=
8>C144>B144>A144>C191>B191>A191>C108>B108>A108>C139>B139>A139>C194>B194>A=
194>C166>B166>A166>C120>B120>A120>C123>B123>A123>C132>B132>A132>C107>B107=
>A107>C170>B170>A170>C198>B198>A156>C125>B125>A125>C121>B121>A121>C193>B1=
93>A193>C197>B197>A197>C175>B175>A175>C196>B196>A196>C105>B105>A105>C181>=
B181>A181>C113>B113>A113>C137>B137>A137>C155>B155>A155>C156>B156>A110>C12=
8>B128>A128>C179>B179>A179>C124>B124>A124>C151>B151>A151>C178>B178>A178>C=
104>B104>A104>C111>B111>A111>C148>B148>A148>C169>B169>A169>C129>B129>A129=
>C149>B149>A149>C189>B189>A189>C119>B119>A119>C154>B154>A154>C136>B136>A1=
36>C135>B135>A135>C116>B116>A116>C145>B145>A145>C161>B161>A161>C173>B173>=
A173>C157>B157>A157>C195>B195>A195>C186>B186>A186>C160>B160>A160>C153>B15=
3>A153>C117>B117>A117>C165>B165>A165>C101>B101>A101>C103>B103>A103>C192>B=
192>A192>C177>B177>A177>C185>B185>A185>C141>B141>A141>C133>B133>A133>C127=
>B127>A127>C110>B110>M14X17>M13X15>M13X16>M13X17>M12X17>M12X21>M12X25>M12=
X14>M13X25>M12X15>M13X21>M12X16>M12X18>M12X19>M12X20>M12X22>M12X23>M12X24=
>M11X25>M11X24>M11X23>M11X22>M11X21>M11X20>M11X19>M11X18>M11X17>M11X16>M1=
1X15>M11X14>M11X13>M11X12>{}<M11X12<M11X13<M11X14<M11X15<M11X16<M11X17<M1=
1X18<M11X19<M11X20<M11X21<M11X22<M11X23<M11X24<M11X25<M12X24<M12X23<M12X2=
2<M12X20<M12X19<M12X18<M12X16<M13X21<M12X15<M13X25<M12X14<M12X25<M12X21<M=
12X17<M13X17<M13X16<M13X15<M14X17<B110<C110<A127<B127<C127<A133<B133<C133=
<A141<B141<C141<A185<B185<C185<A177<B177<C177<A192<B192<C192<A103<B103<C1=
03<A101<B101<C101<A165<B165<C165<A117<B117<C117<A153<B153<C153<A160<B160<=
C160<A186<B186<C186<A195<B195<C195<A157<B157<C157<A173<B173<C173<A161<B16=
1<C161<A145<B145<C145<A116<B116<C116<A135<B135<C135<A136<B136<C136<A154<B=
154<C154<A119<B119<C119<A189<B189<C189<A149<B149<C149<A129<B129<C129<A169=
<B169<C169<A148<B148<C148<A111<B111<C111<A104<B104<C104<A178<B178<C178<A1=
51<B151<C151<A124<B124<C124<A179<B179<C179<A128<B128<C128<A110<B156<C156<=
A155<B155<C155<A137<B137<C137<A113<B113<C113<A181<B181<C181<A105<B105<C10=
5<A196<B196<C196<A175<B175<C175<A197<B197<C197<A193<B193<C193<A121<B121<C=
121<A125<B125<C125<A156<B198<C198<A170<B170<C170<A107<B107<C107<A132<B132=
<C132<A123<B123<C123<A120<B120<C120<A166<B166<C166<A194<B194<C194<A139<B1=
39<C139<A108<B108<C108<A191<B191<C191<A144<B144<C144<A198<B150<C150<A147<=
B147<C147<A152<B152<C152<A183<B183<C183<A200<B200<C200<A106<B106<C106<A11=
4<B114<C114<A199<B199<C199<A188<B188<C188<A131<B131<C131<A164<B164<C164<A=
158<B158<C112<A163<B163<C163<A140<B140<C140<A167<B167<C146<A134<B134<C134=
<A159<B159<C159<A109<B109<C109<A168<B168<C182<A182<B182<C168<A171<B171<C1=
71<A184<B184<C184<A118<B118<C118<A130<B130<C130<A187<B187<C187<A172<B172<=
C172<A143<B115<C115<A176<B176<C176<A174<B102<C102<A142<B142<C142<A162<B16=
2<C162<A122<B122<C122<A102<B174<C174<A138<B138<C138<A190<B190<C190<A126<B=
126<C126<A115<B143<C143<A180<B180<C180<A146<B146<C167<A112<B112<C158<A150=
<M28X12<M18X18<M20X16<M22X24<M24X23<M25X12<M15X15<M17X13<M19X21<M21X19<M2=
3X12<M13X13<M14X18<M15X21<M17X19<M19X12<M21X25<M23X18<M24X17<M25X22<M26X1=
6<M27X12<M17X17<M19X20<M21X23<M23X11<M24X16<M26X12<M16X16<M18X24<M20X22<M=
21X14<M22X16<M23X23<M24X12<M14X14<M16X17<M18X20<M19X22<M21X15<M22X12<M12X=
12<M13X22<M13X23<M13X24<M14X19<M14X25<M16X18<M17X15<M18X11<M19X11<M20X11<=
M21X12<M11X11<M12X11<M13X11<M14X12<M13X12<M14X23<M15X24<M12X13<M13X18<M14=
X13<M13X19<M14X24<M15X19<M14X11<M13X20<M14X20<M15X20<M14X22<M15X13<M16X20=
<M15X14<M14X21<M15X16<M16X21<M15X18<M13X14<M14X15<M15X25<M16X15<M15X11<M1=
6X11<M15X12<M16X22<M17X12<M14X16<M15X22<M16X12<M17X22<M16X13<M17X18<M16X1=
4<M17X14<M18X14<M15X23<M16X23<M17X23<M18X25<M19X15<M16X25<M17X16<M18X23<M=
16X24<M17X21<M15X17<M16X19<M17X24<M18X19<M17X25<M18X15<M19X25<M18X17<M17X=
11<M18X13<M19X19<M17X20<M18X21<M19X16<M19X17<M20X17<M19X18<M18X22<M19X14<=
M20X15<M20X12<M22X25<M20X13<M20X14<M18X12<M19X24<M20X21<M21X18<M19X13<M20=
X18<M21X13<M20X19<M20X20<M21X22<M18X16<M19X23<M20X25<M21X16<M22X23<M21X17=
<M21X11<M22X13<M22X14<M20X24<M21X20<M21X21<M22X17<M23X20<M22X18<M23X16<M2=
5X11<M22X22<M20X23<M21X24<M22X19<M23X25<M22X20<M23X21<M24X24<M22X21<M23X1=
9<M24X11<M23X22<M24X15<M22X11<M23X14<M24X18<M23X15<M24X13<M23X24<M24X25<M=
23X17<M24X19<M25X14<M22X15<M23X13<M24X20<M25X24<M25X25<M24X21<M25X20<M25X=
21<M24X22<M25X15<M25X16<M26X25<M26X11<M25X23<M24X14<M25X19<M26X13<M26X15<=
M26X20<M25X17<M26X21<M25X18<M26X17<M27X22<M27X23<M26X18<M26X19<M27X16<M28=
X14<M25X13<M26X22<M27X17<M26X23<M27X13<M27X14<M27X15<M26X24<M27X24<M28X25=
<M27X11<M28X18<M27X25<M26X14<M27X19<M27X20<M28X13<M27X21<M28X23<M28X24<M2=
8X22<M28X11<M28X17<M29X11<M27X18<M28X21<M28X16<M28X15<M28X20<M29X14<M29X2=
5<M29X21<M28X19<M29X18<M29X17<M29X13<M29X24<M29X16<M29X23<M29X19<M30X25<M=
29X22<M30X21<M30X22<M29X12<M29X15<M30X18<M30X20<M30X24<M30X23<M29X20<M30X=
14<M30X13<M30X17<M30X12<M30X11<M30X16<M30X15<M30X19
>> +output:
>> M30X19>M30X15>M30X16>M30X11>M30X12>M30X17>M30X13>M30X14>M29X20>M30X23>=
M30X24>M30X20>M30X18>M29X15>M29X12>M30X22>M30X21>M29X22>M30X25>M29X19>M29=
X23>M29X16>M29X24>M29X13>M29X17>M29X18>M28X19>M29X21>M29X25>M29X14>M28X20=
>M28X15>M28X16>M28X21>M27X18>M29X11>M28X17>M28X11>M28X22>M28X24>M28X23>M2=
7X21>M28X13>M27X20>M27X19>M26X14>M27X25>M28X18>M27X11>M28X25>M27X24>M26X2=
4>M27X15>M27X14>M27X13>M26X23>M27X17>M26X22>M25X13>M28X14>M27X16>M26X19>M=
26X18>M27X23>M27X22>M26X17>M25X18>M26X21>M25X17>M26X20>M26X15>M26X13>M25X=
19>M24X14>M25X23>M26X11>M26X25>M25X16>M25X15>M24X22>M25X21>M25X20>M24X21>=
M25X25>M25X24>M24X20>M23X13>M22X15>M25X14>M24X19>M23X17>M24X25>M23X24>M24=
X13>M23X15>M24X18>M23X14>M22X11>M24X15>M23X22>M24X11>M23X19>M22X21>M24X24=
>M23X21>M22X20>M23X25>M22X19>M21X24>M20X23>M22X22>M25X11>M23X16>M22X18>M2=
3X20>M22X17>M21X21>M21X20>M20X24>M22X14>M22X13>M21X11>M21X17>M22X23>M21X1=
6>M20X25>M19X23>M18X16>M21X22>M20X20>M20X19>M21X13>M20X18>M19X13>M21X18>M=
20X21>M19X24>M18X12>M20X14>M20X13>M22X25>M20X12>M20X15>M19X14>M18X22>M19X=
18>M20X17>M19X17>M19X16>M18X21>M17X20>M19X19>M18X13>M17X11>M18X17>M19X25>=
M18X15>M17X25>M18X19>M17X24>M16X19>M15X17>M17X21>M16X24>M18X23>M17X16>M16=
X25>M19X15>M18X25>M17X23>M16X23>M15X23>M18X14>M17X14>M16X14>M17X18>M16X13=
>M17X22>M16X12>M15X22>M14X16>M17X12>M16X22>M15X12>M16X11>M15X11>M16X15>M1=
5X25>M14X15>M13X14>M15X18>M16X21>M15X16>M14X21>M15X14>M16X20>M15X13>M14X2=
2>M15X20>M14X20>M13X20>M14X11>M15X19>M14X24>M13X19>M14X13>M13X18>M12X13>M=
15X24>M14X23>M13X12>M14X12>M13X11>M12X11>M11X11>M21X12>M20X11>M19X11>M18X=
11>M17X15>M16X18>M14X25>M14X19>M13X24>M13X23>M13X22>M12X12>M22X12>M21X15>=
M19X22>M18X20>M16X17>M14X14>M24X12>M23X23>M22X16>M21X14>M20X22>M18X24>M16=
X16>M26X12>M24X16>M23X11>M21X23>M19X20>M17X17>M27X12>M26X16>M25X22>M24X17=
>M23X18>M21X25>M19X12>M17X19>M15X21>M14X18>M13X13>M23X12>M21X19>M19X21>M1=
7X13>M15X15>M25X12>M24X23>M22X24>M20X16>M18X18>M28X12>A150>C158>B112>A112=
>C167>B146>A146>C180>B180>A180>C143>B143>A115>C126>B126>A126>C190>B190>A1=
90>C138>B138>A138>C174>B174>A102>C122>B122>A122>C162>B162>A162>C142>B142>=
A142>C102>B102>A174>C176>B176>A176>C115>B115>A143>C172>B172>A172>C187>B18=
7>A187>C130>B130>A130>C118>B118>A118>C184>B184>A184>C171>B171>A171>C168>B=
182>A182>C182>B168>A168>C109>B109>A109>C159>B159>A159>C134>B134>A134>C146=
>B167>A167>C140>B140>A140>C163>B163>A163>C112>B158>A158>C164>B164>A164>C1=
31>B131>A131>C188>B188>A188>C199>B199>A199>C114>B114>A114>C106>B106>A106>=
C200>B200>A200>C183>B183>A183>C152>B152>A152>C147>B147>A147>C150>B150>A19=
8>C144>B144>A144>C191>B191>A191>C108>B108>A108>C139>B139>A139>C194>B194>A=
194>C166>B166>A166>C120>B120>A120>C123>B123>A123>C132>B132>A132>C107>B107=
>A107>C170>B170>A170>C198>B198>A156>C125>B125>A125>C121>B121>A121>C193>B1=
93>A193>C197>B197>A197>C175>B175>A175>C196>B196>A196>C105>B105>A105>C181>=
B181>A181>C113>B113>A113>C137>B137>A137>C155>B155>A155>C156>B156>A110>C12=
8>B128>A128>C179>B179>A179>C124>B124>A124>C151>B151>A151>C178>B178>A178>C=
104>B104>A104>C111>B111>A111>C148>B148>A148>C169>B169>A169>C129>B129>A129=
>C149>B149>A149>C189>B189>A189>C119>B119>A119>C154>B154>A154>C136>B136>A1=
36>C135>B135>A135>C116>B116>A116>C145>B145>A145>C161>B161>A161>C173>B173>=
A173>C157>B157>A157>C195>B195>A195>C186>B186>A186>C160>B160>A160>C153>B15=
3>A153>C117>B117>A117>C165>B165>A165>C101>B101>A101>C103>B103>A103>C192>B=
192>A192>C177>B177>A177>C185>B185>A185>C141>B141>A141>C133>B133>A133>C127=
>B127>A127>C110>B110>M14X17>M13X15>M13X16>M13X17>M12X17>M12X21>M12X25>M12=
X14>M13X25>M12X15>M13X21>M12X16>M12X18>M12X19>M12X20>M12X22>M12X23>M12X24=
>M11X25>M11X24>M11X23>M11X22>M11X21>M11X20>M11X19>M11X18>M11X17>M11X16>M1=
1X15>M11X14>M11X13>M11X12>{}<M11X12<M11X13<M11X14<M11X15<M11X16<M11X17<M1=
1X18<M11X19<M11X20<M11X21<M11X22<M11X23<M11X24<M11X25<M12X24<M12X23<M12X2=
2<M12X20<M12X19<M12X18<M12X16<M13X21<M12X15<M13X25<M12X14<M12X25<M12X21<M=
12X17<M13X17<M13X16<M13X15<M14X17<B110<C110<A127<B127<C127<A133<B133<C133=
<A141<B141<C141<A185<B185<C185<A177<B177<C177<A192<B192<C192<A103<B103<C1=
03<A101<B101<C101<A165<B165<C165<A117<B117<C117<A153<B153<C153<A160<B160<=
C160<A186<B186<C186<A195<B195<C195<A157<B157<C157<A173<B173<C173<A161<B16=
1<C161<A145<B145<C145<A116<B116<C116<A135<B135<C135<A136<B136<C136<A154<B=
154<C154<A119<B119<C119<A189<B189<C189<A149<B149<C149<A129<B129<C129<A169=
<B169<C169<A148<B148<C148<A111<B111<C111<A104<B104<C104<A178<B178<C178<A1=
51<B151<C151<A124<B124<C124<A179<B179<C179<A128<B128<C128<A110<B156<C156<=
A155<B155<C155<A137<B137<C137<A113<B113<C113<A181<B181<C181<A105<B105<C10=
5<A196<B196<C196<A175<B175<C175<A197<B197<C197<A193<B193<C193<A121<B121<C=
121<A125<B125<C125<A156<B198<C198<A170<B170<C170<A107<B107<C107<A132<B132=
<C132<A123<B123<C123<A120<B120<C120<A166<B166<C166<A194<B194<C194<A139<B1=
39<C139<A108<B108<C108<A191<B191<C191<A144<B144<C144<A198<B150<C150<A147<=
B147<C147<A152<B152<C152<A183<B183<C183<A200<B200<C200<A106<B106<C106<A11=
4<B114<C114<A199<B199<C199<A188<B188<C188<A131<B131<C131<A164<B164<C164<A=
158<B158<C112<A163<B163<C163<A140<B140<C140<A167<B167<C146<A134<B134<C134=
<A159<B159<C159<A109<B109<C109<A168<B168<C182<A182<B182<C168<A171<B171<C1=
71<A184<B184<C184<A118<B118<C118<A130<B130<C130<A187<B187<C187<A172<B172<=
C172<A143<B115<C115<A176<B176<C176<A174<B102<C102<A142<B142<C142<A162<B16=
2<C162<A122<B122<C122<A102<B174<C174<A138<B138<C138<A190<B190<C190<A126<B=
126<C126<A115<B143<C143<A180<B180<C180<A146<B146<C167<A112<B112<C158<A150=
<M28X12<M18X18<M20X16<M22X24<M24X23<M25X12<M15X15<M17X13<M19X21<M21X19<M2=
3X12<M13X13<M14X18<M15X21<M17X19<M19X12<M21X25<M23X18<M24X17<M25X22<M26X1=
6<M27X12<M17X17<M19X20<M21X23<M23X11<M24X16<M26X12<M16X16<M18X24<M20X22<M=
21X14<M22X16<M23X23<M24X12<M14X14<M16X17<M18X20<M19X22<M21X15<M22X12<M12X=
12<M13X22<M13X23<M13X24<M14X19<M14X25<M16X18<M17X15<M18X11<M19X11<M20X11<=
M21X12<M11X11<M12X11<M13X11<M14X12<M13X12<M14X23<M15X24<M12X13<M13X18<M14=
X13<M13X19<M14X24<M15X19<M14X11<M13X20<M14X20<M15X20<M14X22<M15X13<M16X20=
<M15X14<M14X21<M15X16<M16X21<M15X18<M13X14<M14X15<M15X25<M16X15<M15X11<M1=
6X11<M15X12<M16X22<M17X12<M14X16<M15X22<M16X12<M17X22<M16X13<M17X18<M16X1=
4<M17X14<M18X14<M15X23<M16X23<M17X23<M18X25<M19X15<M16X25<M17X16<M18X23<M=
16X24<M17X21<M15X17<M16X19<M17X24<M18X19<M17X25<M18X15<M19X25<M18X17<M17X=
11<M18X13<M19X19<M17X20<M18X21<M19X16<M19X17<M20X17<M19X18<M18X22<M19X14<=
M20X15<M20X12<M22X25<M20X13<M20X14<M18X12<M19X24<M20X21<M21X18<M19X13<M20=
X18<M21X13<M20X19<M20X20<M21X22<M18X16<M19X23<M20X25<M21X16<M22X23<M21X17=
<M21X11<M22X13<M22X14<M20X24<M21X20<M21X21<M22X17<M23X20<M22X18<M23X16<M2=
5X11<M22X22<M20X23<M21X24<M22X19<M23X25<M22X20<M23X21<M24X24<M22X21<M23X1=
9<M24X11<M23X22<M24X15<M22X11<M23X14<M24X18<M23X15<M24X13<M23X24<M24X25<M=
23X17<M24X19<M25X14<M22X15<M23X13<M24X20<M25X24<M25X25<M24X21<M25X20<M25X=
21<M24X22<M25X15<M25X16<M26X25<M26X11<M25X23<M24X14<M25X19<M26X13<M26X15<=
M26X20<M25X17<M26X21<M25X18<M26X17<M27X22<M27X23<M26X18<M26X19<M27X16<M28=
X14<M25X13<M26X22<M27X17<M26X23<M27X13<M27X14<M27X15<M26X24<M27X24<M28X25=
<M27X11<M28X18<M27X25<M26X14<M27X19<M27X20<M28X13<M27X21<M28X23<M28X24<M2=
8X22<M28X11<M28X17<M29X11<M27X18<M28X21<M28X16<M28X15<M28X20<M29X14<M29X2=
5<M29X21<M28X19<M29X18<M29X17<M29X13<M29X24<M29X16<M29X23<M29X19<M30X25<M=
29X22<M30X21<M30X22<M29X12<M29X15<M30X18<M30X20<M30X24<M30X23<M29X20<M30X=
14<M30X13<M30X17<M30X12<M30X11<M30X16<M30X15<M30X19
>> diff --git a/elf/tst-rtld-list-tunables.exp b/elf/tst-rtld-list-tunabl=
es.exp
>> index 2233ea9c7c..f70c16ecb8 100644
>> --- a/elf/tst-rtld-list-tunables.exp
>> +++ b/elf/tst-rtld-list-tunables.exp
>> @@ -11,6 +11,5 @@ glibc.malloc.tcache_max: 0x0 (min: 0x0, max: 0x[f]+)=

>> =C2=A0 glibc.malloc.tcache_unsorted_limit: 0x0 (min: 0x0, max: 0x[f]+)=

>> =C2=A0 glibc.malloc.top_pad: 0x20000 (min: 0x0, max: 0x[f]+)
>> =C2=A0 glibc.malloc.trim_threshold: 0x0 (min: 0x0, max: 0x[f]+)
>> -glibc.rtld.dynamic_sort: 2 (min: 1, max: 2)
>> =C2=A0 glibc.rtld.nns: 0x4 (min: 0x1, max: 0x10)
>> =C2=A0 glibc.rtld.optional_static_tls: 0x200 (min: 0x0, max: 0x[f]+)
>> diff --git a/manual/tunables.texi b/manual/tunables.texi
>> index 70dd2264c5..ae6959379b 100644
>> --- a/manual/tunables.texi
>> +++ b/manual/tunables.texi
>> @@ -47,7 +47,6 @@ glibc.elision.enable: 0 (min: 0, max: 1)
>> =C2=A0 glibc.malloc.hugetlb: 0x0 (min: 0x0, max: 0xffffffffffffffff)
>> =C2=A0 glibc.cpu.x86_rep_movsb_threshold: 0x2000 (min: 0x100, max: 0xf=
fffffffffffffff)
>> =C2=A0 glibc.malloc.mxfast: 0x0 (min: 0x0, max: 0xffffffffffffffff)
>> -glibc.rtld.dynamic_sort: 2 (min: 1, max: 2)
>> =C2=A0 glibc.elision.skip_lock_busy: 3 (min: 0, max: 2147483647)
>> =C2=A0 glibc.malloc.top_pad: 0x20000 (min: 0x0, max: 0xfffffffffffffff=
f)
>> =C2=A0 glibc.cpu.x86_rep_stosb_threshold: 0x800 (min: 0x1, max: 0xffff=
ffffffffffff)
>> @@ -334,18 +333,6 @@ changed once allocated at process startup.=C2=A0 =
The default allocation of
>> =C2=A0 optional static TLS is 512 bytes and is allocated in every thre=
ad.
>> =C2=A0 @end deftp
>> =C2=A0 -@deftp Tunable glibc.rtld.dynamic_sort
>> -Sets the algorithm to use for DSO sorting, valid values are @samp{1} =
and
>> -@samp{2}.=C2=A0 For value of @samp{1}, an older O(n^3) algorithm is u=
sed, which is
>> -long time tested, but may have performance issues when dependencies b=
etween
>> -shared objects contain cycles due to circular dependencies.=C2=A0 Whe=
n set to the
>> -value of @samp{2}, a different algorithm is used, which implements a
>> -topological sort through depth-first search, and does not exhibit the=

>> -performance issues of @samp{1}.
>> -
>> -The default value of this tunable is @samp{2}.
>> -@end deftp
>> -
>> =C2=A0 @node Elision Tunables
>> =C2=A0 @section Elision Tunables
>> =C2=A0 @cindex elision tunables
>> diff --git a/sysdeps/mach/hurd/dl-sysdep.c b/sysdeps/mach/hurd/dl-sysd=
ep.c
>> index a2115f6edb..cc4e58043f 100644
>> --- a/sysdeps/mach/hurd/dl-sysdep.c
>> +++ b/sysdeps/mach/hurd/dl-sysdep.c
>> @@ -102,9 +102,6 @@ _dl_sysdep_start (void **start_argptr,
>> =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 __tunables_init (_en=
viron);
>> =C2=A0 -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Initialize DSO sorting algor=
ithm after tunables.=C2=A0 */
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 _dl_sort_maps_init ();
>> -
>> =C2=A0 #ifdef DL_SYSDEP_INIT
>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 DL_SYSDEP_INIT;
>> =C2=A0 #endif
>> diff --git a/sysdeps/unix/sysv/linux/dl-sysdep.c b/sysdeps/unix/sysv/l=
inux/dl-sysdep.c
>> index 1b3dd869b5..4eed762754 100644
>> --- a/sysdeps/unix/sysv/linux/dl-sysdep.c
>> +++ b/sysdeps/unix/sysv/linux/dl-sysdep.c
>> @@ -109,9 +109,6 @@ _dl_sysdep_start (void **start_argptr,
>> =C2=A0 =C2=A0=C2=A0=C2=A0 __tunables_init (_environ);
>> =C2=A0 -=C2=A0 /* Initialize DSO sorting algorithm after tunables.=C2=A0=
 */
>> -=C2=A0 _dl_sort_maps_init ();
>> -
>> =C2=A0=C2=A0=C2=A0 __brk (0);=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 /* Initialize the break.=C2=A0 */
>> =C2=A0 =C2=A0 #ifdef DL_PLATFORM_INIT