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x86: Fix bug about glibc.cpu.hwcaps.

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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".
This commit is contained in:
caiyinyu 2023-02-28 16:21:41 +08:00
parent 436a604b7d
commit 4c721f24fc
1 changed files with 3 additions and 3 deletions
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6
sysdeps/x86/cpu-tunables.c
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@ -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