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Commit f41d830f authored by Fenghua Yu's avatar Fenghua Yu Committed by H. Peter Anvin
Browse files

x86/xsaves: Save xstate to task's xsave area in __save_fpu during booting time 



__save_fpu() can be called during early booting time when cpu caps are not
enabled and alternative can not be used yet. Therefore, it calls
xsave_state_booting() during booting time to save xstate to task's xsave area.

Signed-off-by: default avatarFenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1401387164-43416-14-git-send-email-fenghua.yu@intel.com


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent adb9d526

arch/x86/include/asm/fpu-internal.h

+6 −3
Original line number Diff line number Diff line
@@ -508,9 +508,12 @@ static inline void user_fpu_begin(void) 


static inline void __save_fpu(struct task_struct *tsk)

{

	if (use_xsave())

		xsave_state(&tsk->thread.fpu.state->xsave, -1);

	if (use_xsave()) {

		if (unlikely(system_state == SYSTEM_BOOTING))

			xsave_state_booting(&tsk->thread.fpu.state->xsave, -1);

		else

			xsave_state(&tsk->thread.fpu.state->xsave, -1);

	} else

		fpu_fxsave(&tsk->thread.fpu);

}