diff options
Diffstat (limited to 'arch/i386/kernel/cpu/mtrr/main.c')
| -rw-r--r-- | arch/i386/kernel/cpu/mtrr/main.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/i386/kernel/cpu/mtrr/main.c b/arch/i386/kernel/cpu/mtrr/main.c index 1cf466df330..75dc6d5214b 100644 --- a/arch/i386/kernel/cpu/mtrr/main.c +++ b/arch/i386/kernel/cpu/mtrr/main.c @@ -229,6 +229,8 @@ static void set_mtrr(unsigned int reg, unsigned long base, data.smp_size = size; data.smp_type = type; atomic_set(&data.count, num_booting_cpus() - 1); + /* make sure data.count is visible before unleashing other CPUs */ + smp_wmb(); atomic_set(&data.gate,0); /* Start the ball rolling on other CPUs */ @@ -242,6 +244,7 @@ static void set_mtrr(unsigned int reg, unsigned long base, /* ok, reset count and toggle gate */ atomic_set(&data.count, num_booting_cpus() - 1); + smp_wmb(); atomic_set(&data.gate,1); /* do our MTRR business */ @@ -260,6 +263,7 @@ static void set_mtrr(unsigned int reg, unsigned long base, cpu_relax(); atomic_set(&data.count, num_booting_cpus() - 1); + smp_wmb(); atomic_set(&data.gate,0); /* @@ -639,7 +643,7 @@ static struct sysdev_driver mtrr_sysdev_driver = { * initialized (i.e. before smp_init()). * */ -void mtrr_bp_init(void) +__init void mtrr_bp_init(void) { init_ifs(); @@ -734,10 +738,13 @@ 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) |