* [tip:x86/xsave] x86/xsaves: Save xstate to task' s xsave area in __save_fpu during booting time
[not found] <1401387164-43416-14-git-send-email-fenghua.yu@intel.com>
@ 2014-05-30 15:13 ` tip-bot for Fenghua Yu
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From: tip-bot for Fenghua Yu @ 2014-05-30 15:13 UTC (permalink / raw)
To: linux-tip-commits; +Cc: linux-kernel, hpa, mingo, fenghua.yu, tglx, hpa
Commit-ID: f41d830fa890044cb60f6bb39fc8f6493ffebb47
Gitweb: http://git.kernel.org/tip/f41d830fa890044cb60f6bb39fc8f6493ffebb47
Author: Fenghua Yu <fenghua.yu@intel.com>
AuthorDate: Thu, 29 May 2014 11:12:41 -0700
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Thu, 29 May 2014 14:33:04 -0700
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: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1401387164-43416-14-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/include/asm/fpu-internal.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index cea1c76..6099c0e 100644
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -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);
- else
+ 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);
}
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