diff options
| author | Mathieu Desnoyers <[email protected]> | 2024-12-03 16:35:58 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2024-12-05 13:25:28 +0000 |
| commit | 63a48181fbcddefe5fb4c6618938bb64c543945b (patch) | |
| tree | 203e7fa55596c828d847b37c6cf971c915ad1976 /drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | |
| parent | locking/lockdep: Enforce PROVE_RAW_LOCK_NESTING only if ARCH_SUPPORTS_RT (diff) | |
| download | kernel-63a48181fbcddefe5fb4c6618938bb64c543945b.tar.gz kernel-63a48181fbcddefe5fb4c6618938bb64c543945b.zip | |
smp/scf: Evaluate local cond_func() before IPI side-effects
In smp_call_function_many_cond(), the local cond_func() is evaluated
after triggering the remote CPU IPIs.
If cond_func() depends on loading shared state updated by other CPU's
IPI handlers func(), then triggering execution of remote CPUs IPI before
evaluating cond_func() may have unexpected consequences.
One example scenario is evaluating a jiffies delay in cond_func(), which
is updated by func() in the IPI handlers. This situation can prevent
execution of periodic cleanup code on the local CPU.
Signed-off-by: Mathieu Desnoyers <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c')
0 files changed, 0 insertions, 0 deletions