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| author | Sebastian Andrzej Siewior <[email protected]> | 2023-02-07 10:46:33 +0000 |
|---|---|---|
| committer | Borislav Petkov (AMD) <[email protected]> | 2023-02-07 17:20:41 +0000 |
| commit | 877cff5296faa6ef312f8002216bbf73bea006c7 (patch) | |
| tree | eea8bdb0d80b396f147f917dbabc3e6e2b5ca1c7 /lib/string.c | |
| parent | selftests: Emit a warning if getcpu() is missing on 32bit (diff) | |
| download | kernel-877cff5296faa6ef312f8002216bbf73bea006c7.tar.gz kernel-877cff5296faa6ef312f8002216bbf73bea006c7.zip | |
x86/vdso: Fake 32bit VDSO build on 64bit compile for vgetcpu
The 64bit register constrains in __arch_hweight64() cannot be
fulfilled in a 32-bit build. The function is only declared but not used
within vclock_gettime.c and gcc does not care. LLVM complains and
aborts. Reportedly because it validates extended asm even if latter
would get compiled out, see
https://lore.kernel.org/r/Y%2BJ%[email protected]
i.e., a long standing design difference between gcc and LLVM.
Move the "fake a 32 bit kernel configuration" bits from vclock_gettime.c
into a common header file. Use this from vclock_gettime.c and vgetcpu.c.
[ bp: Add background info from Nathan. ]
Fixes: 92d33063c081a ("x86/vdso: Provide getcpu for x86-32.")
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'lib/string.c')
0 files changed, 0 insertions, 0 deletions