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 <b...@alien8.de>
Cc: Andy Lutomirski <l...@amacapital.net>
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: Fenghua Yu <fenghua...@intel.com>
Cc: H. Peter Anvin <h...@zytor.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Oleg Nesterov <o...@redhat.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Ingo Molnar <mi...@kernel.org>
---
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 adeab16655ae..d11b33514130 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();
}
/*
--
2.1.0
--
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