diff options
| author | Jens Axboe | 2023-01-24 08:23:20 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2023-03-10 09:33:47 +0100 |
| commit | 909eb5116ee5bfa45e7a265084a9712bbcca08b6 (patch) | |
| tree | 17ddf26b6b21846c83a04821e0119f8490873faa /arch/x86/include | |
| parent | a3a54e6a021ce1bf079c7cfe392bf97d6f5b3777 (diff) | |
x86/fpu: Don't set TIF_NEED_FPU_LOAD for PF_IO_WORKER threads
[ Upstream commit cb3ea4b7671b7cfbac3ee609976b790aebd0bbda ]
We don't set it on PF_KTHREAD threads as they never return to userspace,
and PF_IO_WORKER threads are identical in that regard. As they keep
running in the kernel until they die, skip setting the FPU flag on them.
More of a cosmetic thing that was found while debugging and
issue and pondering why the FPU flag is set on these threads.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/560c844c-f128-555b-40c6-31baff27537f@kernel.dk
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/fpu/sched.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/fpu/sched.h b/arch/x86/include/asm/fpu/sched.h index b2486b2cbc6e..c2d6cd78ed0c 100644 --- a/arch/x86/include/asm/fpu/sched.h +++ b/arch/x86/include/asm/fpu/sched.h @@ -39,7 +39,7 @@ extern void fpu_flush_thread(void); static inline void switch_fpu_prepare(struct fpu *old_fpu, int cpu) { if (cpu_feature_enabled(X86_FEATURE_FPU) && - !(current->flags & PF_KTHREAD)) { + !(current->flags & (PF_KTHREAD | PF_IO_WORKER))) { save_fpregs_to_fpstate(old_fpu); /* * The save operation preserved register state, so the |