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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>
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@ -358,14 +358,13 @@ static inline void __thread_fpu_begin(struct fpu *fpu)
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__thread_set_has_fpu(fpu);
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}
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static inline void drop_fpu(struct task_struct *tsk)
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static inline void drop_fpu(struct fpu *fpu)
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{
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struct fpu *fpu = &tsk->thread.fpu;
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/*
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* Forget coprocessor state..
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*/
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preempt_disable();
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tsk->thread.fpu.counter = 0;
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fpu->counter = 0;
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if (fpu->has_fpu) {
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/* Ignore delayed exceptions from user space */
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@ -394,8 +393,10 @@ static inline void restore_init_xstate(void)
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*/
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static inline void fpu_reset_state(struct task_struct *tsk)
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{
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struct fpu *fpu = &tsk->thread.fpu;
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if (!use_eager_fpu())
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drop_fpu(tsk);
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drop_fpu(fpu);
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else
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restore_init_xstate();
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}
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@ -389,7 +389,7 @@ void fpu__flush_thread(struct task_struct *tsk)
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if (!use_eager_fpu()) {
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/* FPU state will be reallocated lazily at the first use. */
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drop_fpu(tsk);
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drop_fpu(fpu);
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fpstate_free(&tsk->thread.fpu);
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} else {
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if (!fpu->fpstate_active) {
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@ -392,7 +392,7 @@ int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)
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* We will be ready to restore/save the state only after
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* fpu->fpstate_active is again set.
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*/
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drop_fpu(tsk);
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drop_fpu(fpu);
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if (__copy_from_user(&fpu->state->xsave, buf_fx, state_size) ||
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__copy_from_user(&env, buf, sizeof(env))) {
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@ -104,6 +104,7 @@ void exit_thread(void)
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struct task_struct *me = current;
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struct thread_struct *t = &me->thread;
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unsigned long *bp = t->io_bitmap_ptr;
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struct fpu *fpu = &t->fpu;
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if (bp) {
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struct tss_struct *tss = &per_cpu(cpu_tss, get_cpu());
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@ -119,7 +120,7 @@ void exit_thread(void)
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kfree(bp);
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}
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drop_fpu(me);
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drop_fpu(fpu);
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}
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void flush_thread(void)
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