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877cff52 |
| 07-Feb-2023 |
Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
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 wit
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%2BUQ1vAKr6RHuH@dev-arch.thelio-3990X
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 <lkp@intel.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/Y+IsCWQdXEr8d9Vy@linutronix.de
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