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Fix issues in sysdeps/x86/tst-hwcap-tunables.c added by
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed Dec 6 10:24:01 2023 -0300
elf: Do not duplicate the GLIBC_TUNABLES string
1. -AVX,-AVX2,-AVX512F should be used to disable AVX, AVX2 and AVX512.
2. AVX512 IFUNC functions check AVX512VL. -AVX512VL should be added
to disable these functions.
This fixed:
FAIL: elf/tst-hwcap-tunables
...
[0] Spawned test for -Prefer_ERMS,-Prefer_FSRM,-AVX,-AVX2,-AVX_Usable,-AVX2_Usable,-AVX512F_Usable,-SSE4_1,-SSE4_2,-SSSE3,-Fast_Unaligned_Load,-ERMS,-AVX_Fast_Unaligned_Load
error: subprocess failed: tst-tunables
error: unexpected output from subprocess
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
[1] Spawned test for ,-,-Prefer_ERMS,-Prefer_FSRM,-AVX,-AVX2,-AVX_Usable,-AVX2_Usable,-AVX512F_Usable,-SSE4_1,-SSE4_2,,-SSSE3,-Fast_Unaligned_Load,,-,-ERMS,-AVX_Fast_Unaligned_Load,-,
error: subprocess failed: tst-tunables
error: unexpected output from subprocess
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
../sysdeps/x86/tst-hwcap-tunables.c:91: numeric comparison failure
left: 1 (0x1); from: impls[i].usable
right: 0 (0x0); from: false
error: 2 test failures
on Intel Tiger Lake.
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The tunable parsing duplicates the tunable environment variable so it
null-terminates each one since it simplifies the later parsing. It has
the drawback of adding another point of failure (__minimal_malloc
failing), and the memory copy requires tuning the compiler to avoid mem
operations calls.
The parsing now tracks the tunable start and its size. The
dl-tunable-parse.h adds helper functions to help parsing, like a strcmp
that also checks for size and an iterator for suboptions that are
comma-separated (used on hwcap parsing by x86, powerpc, and s390x).
Since the environment variable is allocated on the stack by the kernel,
it is safe to keep the references to the suboptions for later parsing
of string tunables (as done by set_hwcaps by multiple architectures).
Checked on x86_64-linux-gnu, powerpc64le-linux-gnu, and
aarch64-linux-gnu.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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