From 26b1f5d05a81a0e60eed718d2d073f050b0afc8f Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Sat, 25 Apr 2015 05:27:26 +0200 Subject: [PATCH] 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 Cc: Andy Lutomirski Cc: Dave Hansen Cc: Fenghua Yu Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Oleg Nesterov Cc: Peter Zijlstra Cc: Thomas Gleixner Signed-off-by: Ingo Molnar --- 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(); } /* -- 2.11.0