diff options
Diffstat (limited to 'arch/i386/kernel/smp.c')
| -rw-r--r-- | arch/i386/kernel/smp.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c index 59af7034d..9acf81556 100644 --- a/arch/i386/kernel/smp.c +++ b/arch/i386/kernel/smp.c @@ -11,6 +11,7 @@ #include <linux/init.h> #include <linux/mm.h> +#include <linux/spinlock.h> #include <linux/kernel_stat.h> #include <linux/smp_lock.h> #include <linux/irq.h> @@ -638,12 +639,19 @@ int prof_counter[NR_CPUS] = { 1, }; */ static unsigned int __init get_8254_timer_count(void) { + extern rwlock_t xtime_lock; + unsigned long flags; + unsigned int count; + write_lock_irqsave(&xtime_lock, flags); + outb_p(0x00, 0x43); count = inb_p(0x40); count |= inb_p(0x40) << 8; + write_unlock_irqrestore(&xtime_lock, flags); + return count; } |