From: caiyinyu <caiyinyu@loongson.cn>
To: Noah Goldstein <goldstein.w.n@gmail.com>
Cc: Xi Ruoyao <xry111@xry111.site>, "H.J. Lu" <hjl.tools@gmail.com>,
libc-alpha@sourceware.org
Subject: Re: [PATCH] x86: Fix bug about glibc.cpu.hwcaps.
Date: Wed, 8 Mar 2023 15:16:23 +0800 [thread overview]
Message-ID: <3398ea16-1e36-8c08-0041-f7a4a2193907@loongson.cn> (raw)
In-Reply-To: <CAFUsyfJiK5mcAiagGSopSeJAfwZepQu4M_gt9CdfigE+S_r5ig@mail.gmail.com>
在 2023/3/8 上午1:23, Noah Goldstein 写道:
> On Tue, Mar 7, 2023 at 7:18 AM caiyinyu <caiyinyu@loongson.cn> wrote:
>>
>> 在 2023/3/7 下午9:02, Xi Ruoyao 写道:
>>> On Tue, 2023-03-07 at 20:45 +0800, caiyinyu wrote:
>>>> 在 2023/3/2 下午12:22, H.J. Lu 写道:
>>>>> On Wed, Mar 1, 2023 at 6:36 PM caiyinyu <caiyinyu@loongson.cn>
>>>>> wrote:
>>>>>> Recorded in [BZ #30183]:
>>>>>>
>>>>>> 1. export GLIBC_TUNABLES=glibc.cpu.hwcaps=-AVX512
>>>>>> 2. Add _dl_printf("p -- %s\n", p); just before switch(nl) in
>>>>>> sysdeps/x86/cpu-tunables.c
>>>>>> 3. compiled and run ./testrun.sh /usr/bin/ls
>>>>>> you will get:
>>>>>>
>>>>>> p -- -AVX512
>>>>>> p -- LC_ADDRESS=en_US.UTF-8
>>>>>> p -- LC_NUMERIC=C
>>>>>> ...
>>>>>>
>>>>>> The function, TUNABLE_CALLBACK (set_hwcaps)
>>>>>> (tunable_val_t *valp), checks far more than it should and it
>>>>>> should stop at end of "-AVX512".
>>>>>> ---
>>>>>> sysdeps/x86/cpu-tunables.c | 6 +++---
>>>>>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>>>>>
>>>>>> diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-
>>>>>> tunables.c
>>>>>> index d3e1367bda..772fb0c4c2 100644
>>>>>> --- a/sysdeps/x86/cpu-tunables.c
>>>>>> +++ b/sysdeps/x86/cpu-tunables.c
>>>>>> @@ -107,13 +107,13 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t
>>>>>> *valp)
>>>>>> NOTE: the IFUNC selection may change over time. Please
>>>>>> check all
>>>>>> multiarch implementations when experimenting. */
>>>>>>
>>>>>> - const char *p = valp->strval;
>>>>>> + const char *p = valp->strval, *c;
>>>>>> struct cpu_features *cpu_features =
>>>>>> &GLRO(dl_x86_cpu_features);
>>>>>> size_t len;
>>>>>>
>>>>>> do
>>>>>> {
>>>>>> - const char *c, *n;
>>>>>> + const char *n;
>>>>>> bool disable;
>>>>>> size_t nl;
>>>>>>
>>>>>> @@ -283,7 +283,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t
>>>>>> *valp)
>>>>>> }
>>>>>> p += len + 1;
>>>>>> }
>>>>>> - while (*p != '\0');
>>>>>> + while (*c != '\0');
>>>>>> }
>>>>>>
>>>>>> # if CET_ENABLED
>>>>>> --
>>>>>> 2.31.1
>>>>>>
>>>>> OK.
>>>>>
>>>>> Thanks.
>>>> Could you help to push this patch?
>>> I guess you can push it yourself. A port maintainer has write access to
>>> the entire Git repository, just use it carefully (i. e. always get a
>>> permission before changing other subsystems).
>>>
>> OK, thanks.
> did you add the tests HJ asked for?
Not yet.
next prev parent reply other threads:[~2023-03-08 7:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-02 2:33 caiyinyu
2023-03-02 4:22 ` H.J. Lu
2023-03-07 12:45 ` caiyinyu
2023-03-07 13:02 ` Xi Ruoyao
2023-03-07 13:18 ` caiyinyu
2023-03-07 17:23 ` Noah Goldstein
2023-03-08 7:16 ` caiyinyu [this message]
2023-03-08 16:56 ` Noah Goldstein
2023-03-09 1:26 ` caiyinyu
2023-03-09 3:25 ` Xi Ruoyao
-- strict thread matches above, loose matches on Subject: below --
2023-03-01 3:22 caiyinyu
2023-03-01 4:19 ` Noah Goldstein
2023-03-01 9:10 ` caiyinyu
2023-03-01 16:42 ` Noah Goldstein
2023-03-01 17:33 ` H.J. Lu
2023-03-02 2:37 ` caiyinyu
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