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Commit a4d8fc2e authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86/fpu: Use 'struct fpu' in __fpu_save() 



Migrate this function to pure 'struct fpu' usage.

Reviewed-by: default avatarBorislav 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: default avatarIngo Molnar <mingo@kernel.org>
parent 2d75bcf3

arch/x86/kernel/fpu/core.c

+10 −10
Original line number Diff line number Diff line
@@ -125,15 +125,15 @@ void __kernel_fpu_end(void) 
}

EXPORT_SYMBOL(__kernel_fpu_end);



static void __save_fpu(struct task_struct *tsk)

static void __save_fpu(struct fpu *fpu)

{

	if (use_xsave()) {

		if (unlikely(system_state == SYSTEM_BOOTING))

			xsave_state_booting(&tsk->thread.fpu.state->xsave);

			xsave_state_booting(&fpu->state->xsave);

		else

			xsave_state(&tsk->thread.fpu.state->xsave);

			xsave_state(&fpu->state->xsave);

	} else {

		fpu_fxsave(&tsk->thread.fpu);

		fpu_fxsave(fpu);

	}

}
@@ -151,7 +151,7 @@ void fpu__save(struct task_struct *tsk) 
	preempt_disable();

	if (fpu->has_fpu) {

		if (use_eager_fpu()) {

			__save_fpu(tsk);

			__save_fpu(fpu);

		} else {

			fpu_save_init(fpu);

			__thread_fpu_end(fpu);
@@ -231,17 +231,17 @@ EXPORT_SYMBOL_GPL(fpstate_free); 
 */

static void fpu_copy(struct task_struct *dst, struct task_struct *src)

{

	struct fpu *dst_fpu = &dst->thread.fpu;

	struct fpu *src_fpu = &src->thread.fpu;



	WARN_ON(src != current);



	if (use_eager_fpu()) {

		memset(&dst->thread.fpu.state->xsave, 0, xstate_size);

		__save_fpu(dst);

		__save_fpu(dst_fpu);

	} else {

		struct fpu *dfpu = &dst->thread.fpu;

		struct fpu *sfpu = &src->thread.fpu;



		fpu__save(src);

		memcpy(dfpu->state, sfpu->state, xstate_size);

		memcpy(dst_fpu->state, src_fpu->state, xstate_size);

	}

}