From 4c738480d21a190e3d99c7ce985ab9484f373a3c Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Sun, 3 Jun 2007 13:50:40 -0700 Subject: [PATCH] mtrr atomicity fix Rafael gets this on an SMP box with kernel preemption enabled, during hibernation and restore (100% of the time): Enabling non-boot CPUs ... BUG: using smp_processor_id() in preemptible [00000001] code: bash/4514 caller is mtrr_save_state+0x9/0x40 Cc: "Rafael J. Wysocki" Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/cpu/mtrr/main.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/i386/kernel/cpu/mtrr/main.c b/arch/i386/kernel/cpu/mtrr/main.c index 1cf466df330a..7202b98aac4f 100644 --- a/arch/i386/kernel/cpu/mtrr/main.c +++ b/arch/i386/kernel/cpu/mtrr/main.c @@ -734,10 +734,13 @@ void mtrr_ap_init(void) */ void mtrr_save_state(void) { - if (smp_processor_id() == 0) + int cpu = get_cpu(); + + if (cpu == 0) mtrr_save_fixed_ranges(NULL); else smp_call_function_single(0, mtrr_save_fixed_ranges, NULL, 1, 1); + put_cpu(); } static int __init mtrr_init_finialize(void) -- 2.20.1