Commit-ID: 62db6871ae862fbd7f7abfebffe501b170698a8b
Gitweb: http://git.kernel.org/tip/62db6871ae862fbd7f7abfebffe501b170698a8b
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Sat, 25 Apr 2015 06:50:09 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:40 +0200
x86/fpu: Propagate once per boot quirk into fpu__init_system_xstate()
Linearize the call sequence in xsave_init():
fpu__init_system_xstate();
fpu__init_cpu_xstate();
We do this by propagating the boot-once quirk into
fpu__init_system_xstate(). fpu__init_cpu_xstate() is
safe to be called multiple time.
Reviewed-by: Borislav Petkov <bp@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/fpu/xsave.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c
index fd656cb..9d5ff90 100644
--- a/arch/x86/kernel/fpu/xsave.c
+++ b/arch/x86/kernel/fpu/xsave.c
@@ -652,6 +652,11 @@ static void __init init_xstate_size(void)
void fpu__init_system_xstate(void)
{
unsigned int eax, ebx, ecx, edx;
+ static bool on_boot_cpu = 1;
+
+ if (!on_boot_cpu)
+ return;
+ on_boot_cpu = 0;
if (!cpu_has_xsave) {
pr_info("x86/fpu: Legacy x87 FPU detected.\n");
@@ -714,14 +719,8 @@ void fpu__init_system_xstate(void)
*/
void xsave_init(void)
{
- static char on_boot_cpu = 1;
-
- if (on_boot_cpu) {
- on_boot_cpu = 0;
- fpu__init_system_xstate();
- } else {
- fpu__init_cpu_xstate();
- }
+ fpu__init_system_xstate();
+ fpu__init_cpu_xstate();
}
/*
--
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