[glibc] elf: Use new dependency sorting algorithm by default

[glibc] elf: Use new dependency sorting algorithm by default

[Florian Weimer]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0884724a95b60452ad483dbe086d237d02ba624d

commit 0884724a95b60452ad483dbe086d237d02ba624d
Author: Florian Weimer <fweimer@redhat.com>
Date:   Tue Dec 14 12:37:44 2021 +0100

    elf: Use new dependency sorting algorithm by default
    
    The default has to change eventually, and there are no known failures
    that require a delay.
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 NEWS                           | 7 ++++---
 elf/dl-tunables.list           | 2 +-
 elf/tst-rtld-list-tunables.exp | 2 +-
 manual/tunables.texi           | 2 +-
 4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/NEWS b/NEWS
index b53f230cca..2aaece42f5 100644
--- a/NEWS
+++ b/NEWS
@@ -60,9 +60,10 @@ Major new features:
   of the existing sorting algorithm when encountering particular circular
   object dependency cases.
 
-* A new tunable, glibc.rtld.dynamic_sort, can be used to select between the two
-  DSO sorting algorithms.  The default setting of '1' uses the current existing
-  algorithm, while a value of '2' selects the new DFS-based algorithm.
+* A new tunable, glibc.rtld.dynamic_sort, can be used to select between
+  the two DSO sorting algorithms.  The default setting of '2' uses the
+  new DFS-based algorithm.  The setting '1' switches to the old
+  algorithm used in glibc 2.33 and earlier.
 
 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
   to be used by compilers for optimizing usage of 'memcmp' when its
diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list
index 46ffb23784..ffcd7f18d4 100644
--- a/elf/dl-tunables.list
+++ b/elf/dl-tunables.list
@@ -162,7 +162,7 @@ glibc {
       type: INT_32
       minval: 1
       maxval: 2
-      default: 1
+      default: 2
     }
   }
 }
diff --git a/elf/tst-rtld-list-tunables.exp b/elf/tst-rtld-list-tunables.exp
index 9bf572715f..44e4834cfb 100644
--- a/elf/tst-rtld-list-tunables.exp
+++ b/elf/tst-rtld-list-tunables.exp
@@ -10,6 +10,6 @@ glibc.malloc.tcache_max: 0x0 (min: 0x0, max: 0x[f]+)
 glibc.malloc.tcache_unsorted_limit: 0x0 (min: 0x0, max: 0x[f]+)
 glibc.malloc.top_pad: 0x0 (min: 0x0, max: 0x[f]+)
 glibc.malloc.trim_threshold: 0x0 (min: 0x0, max: 0x[f]+)
-glibc.rtld.dynamic_sort: 1 (min: 1, max: 2)
+glibc.rtld.dynamic_sort: 2 (min: 1, max: 2)
 glibc.rtld.nns: 0x4 (min: 0x1, max: 0x10)
 glibc.rtld.optional_static_tls: 0x200 (min: 0x0, max: 0x[f]+)
diff --git a/manual/tunables.texi b/manual/tunables.texi
index 5d50b90f64..28ff502990 100644
--- a/manual/tunables.texi
+++ b/manual/tunables.texi
@@ -318,7 +318,7 @@ 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{1}.
+The default value of this tunable is @samp{2}.
 @end deftp
 
 @node Elision Tunables