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x86/fpu: Remove 'struct task_struct' usage from drop_fpu() 

Migrate this function to pure 'struct fpu' usage.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@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>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-04-23 12:33:50 +02:00
parent c5bedc6847
commit ca6787ba0f
4 changed files with 9 additions and 7 deletions
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9
arch/x86/include/asm/fpu-internal.h
View File

@ -358,14 +358,13 @@ static inline void __thread_fpu_begin(struct fpu *fpu)
__thread_set_has_fpu(fpu);
}
static inline void drop_fpu(struct task_struct *tsk)
static inline void drop_fpu(struct fpu *fpu)
{
struct fpu *fpu = &tsk->thread.fpu;
/*
* Forget coprocessor state..
*/
preempt_disable();
tsk->thread.fpu.counter = 0;
fpu->counter = 0;
if (fpu->has_fpu) {
/* Ignore delayed exceptions from user space */
@ -394,8 +393,10 @@ static inline void restore_init_xstate(void)
*/
static inline void fpu_reset_state(struct task_struct *tsk)
{
struct fpu *fpu = &tsk->thread.fpu;
if (!use_eager_fpu())
drop_fpu(tsk);
drop_fpu(fpu);
else
restore_init_xstate();
}

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

@ -389,7 +389,7 @@ void fpu__flush_thread(struct task_struct *tsk)
if (!use_eager_fpu()) {
/* FPU state will be reallocated lazily at the first use. */
drop_fpu(tsk);
drop_fpu(fpu);
fpstate_free(&tsk->thread.fpu);
} else {
if (!fpu->fpstate_active) {

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

@ -392,7 +392,7 @@ int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)
* We will be ready to restore/save the state only after
* fpu->fpstate_active is again set.
*/
drop_fpu(tsk);
drop_fpu(fpu);
if (__copy_from_user(&fpu->state->xsave, buf_fx, state_size) ||
__copy_from_user(&env, buf, sizeof(env))) {

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

@ -104,6 +104,7 @@ void exit_thread(void)
struct task_struct *me = current;
struct thread_struct *t = &me->thread;
unsigned long *bp = t->io_bitmap_ptr;
struct fpu *fpu = &t->fpu;
if (bp) {
struct tss_struct *tss = &per_cpu(cpu_tss, get_cpu());
@ -119,7 +120,7 @@ void exit_thread(void)
kfree(bp);
}
drop_fpu(me);
drop_fpu(fpu);
}
void flush_thread(void)