Commit-ID: 26b1f5d05a81a0e60eed718d2d073f050b0afc8f
Gitweb: http://git.kernel.org/tip/26b1f5d05a81a0e60eed718d2d073f050b0afc8f
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Sat, 25 Apr 2015 05:27:26 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:38 +0200
x86/fpu: Make setup_init_fpu_buf() run-once explicitly
Remove the dependency on the init_xstate_buf == NULL check to
implement once-per-bootup logic in eager_fpu_init(), by making
setup_init_fpu_buf() run once per bootup explicitly.
This is in preparation to make init_xstate_buf statically
allocated.
The various boot-once quirks in the FPU init code will be removed
in a later cleanup stage.
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 | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c
index adeab16..d11b335 100644
--- a/arch/x86/kernel/fpu/xsave.c
+++ b/arch/x86/kernel/fpu/xsave.c
@@ -565,8 +565,14 @@ void setup_xstate_comp(void)
/*
* setup the xstate image representing the init state
*/
-static void __init setup_init_fpu_buf(void)
+static void setup_init_fpu_buf(void)
{
+ static int on_boot_cpu = 1;
+
+ if (!on_boot_cpu)
+ return;
+ on_boot_cpu = 0;
+
/*
* Setup init_xstate_buf to represent the init state of
* all the features managed by the xsave
@@ -738,8 +744,7 @@ void __init_refok eager_fpu_init(void)
return;
}
- if (!init_xstate_buf)
- setup_init_fpu_buf();
+ setup_init_fpu_buf();
}
/*
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|