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x86/fpu: Push 'fpu' pointer calculation into the fpu__drop() call

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This encapsulates the fpu__drop() functionality better, and it
will also enable other changes that want to check a task for
PF_KTHREAD before calling x86_task_fpu().

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Chang S. Bae <chang.seok.bae@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250409211127.3544993-6-mingo@kernel.org
This commit is contained in:
Ingo Molnar 2025-04-09 23:11:24 +02:00
parent 55bc30f2e3
commit ec2227e03a
3 changed files with 5 additions and 4 deletions
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2
arch/x86/include/asm/fpu/sched.h
View File

@ -10,7 +10,7 @@
#include <asm/trace/fpu.h>
extern void save_fpregs_to_fpstate(struct fpu *fpu);
extern void fpu__drop(struct fpu *fpu);
extern void fpu__drop(struct task_struct *tsk);
extern int fpu_clone(struct task_struct *dst, unsigned long clone_flags, bool minimal,
unsigned long shstk_addr);
extern void fpu_flush_thread(void);

4
arch/x86/kernel/fpu/core.c
View File

@ -681,8 +681,10 @@ int fpu_clone(struct task_struct *dst, unsigned long clone_flags, bool minimal,
* a state-restore is coming: either an explicit one,
* or a reschedule.
*/
void fpu__drop(struct fpu *fpu)
void fpu__drop(struct task_struct *tsk)
{
struct fpu *fpu = x86_task_fpu(tsk);
preempt_disable();
if (fpu == x86_task_fpu(current)) {

3
arch/x86/kernel/process.c
View File

@ -120,7 +120,6 @@ void arch_release_task_struct(struct task_struct *tsk)
void exit_thread(struct task_struct *tsk)
{
struct thread_struct *t = &tsk->thread;
struct fpu *fpu = x86_task_fpu(tsk);
if (test_thread_flag(TIF_IO_BITMAP))
io_bitmap_exit(tsk);
@ -128,7 +127,7 @@ void exit_thread(struct task_struct *tsk)
free_vm86(t);
shstk_free(tsk);
fpu__drop(fpu);
fpu__drop(tsk);
}
static int set_new_tls(struct task_struct *p, unsigned long tls)