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Updates in this cycle:

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- Replace zero-length array in struct xregs_state with flexible-array member,
    to help the enabling of stricter compiler checks.
 
  - Don't set TIF_NEED_FPU_LOAD for PF_IO_WORKER threads.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-fpu-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fpu updates from Ingo Molnar:

 - Replace zero-length array in struct xregs_state with flexible-array
   member, to help the enabling of stricter compiler checks.

 - Don't set TIF_NEED_FPU_LOAD for PF_IO_WORKER threads.

* tag 'x86-fpu-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fpu: Don't set TIF_NEED_FPU_LOAD for PF_IO_WORKER threads
  x86/fpu: Replace zero-length array in struct xregs_state with flexible-array member
This commit is contained in:
Linus Torvalds 2023-02-20 18:50:02 -08:00
commit 2e0ddb34e5
4 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/fpu/sched.h
View File

@ -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

2
arch/x86/include/asm/fpu/types.h
View File

@ -321,7 +321,7 @@ struct xstate_header {
struct xregs_state {
struct fxregs_state i387;
struct xstate_header header;
u8 extended_state_area[0];
u8 extended_state_area[];
} __attribute__ ((packed, aligned (64)));
/*

2
arch/x86/kernel/fpu/context.h
View File

@ -57,7 +57,7 @@ static inline void fpregs_restore_userregs(void)
struct fpu *fpu = &current->thread.fpu;
int cpu = smp_processor_id();
if (WARN_ON_ONCE(current->flags & PF_KTHREAD))
if (WARN_ON_ONCE(current->flags & (PF_KTHREAD | PF_IO_WORKER)))
return;
if (!fpregs_state_valid(fpu, cpu)) {

2
arch/x86/kernel/fpu/core.c
View File

@ -426,7 +426,7 @@ void kernel_fpu_begin_mask(unsigned int kfpu_mask)
this_cpu_write(in_kernel_fpu, true);
if (!(current->flags & PF_KTHREAD) &&
if (!(current->flags & (PF_KTHREAD | PF_IO_WORKER)) &&
!test_thread_flag(TIF_NEED_FPU_LOAD)) {
set_thread_flag(TIF_NEED_FPU_LOAD);
save_fpregs_to_fpstate(&current->thread.fpu);