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Diffstat (limited to 'arch')
-rw-r--r--arch/x86/lib/delay_32.c3
-rw-r--r--arch/x86/lib/delay_64.c11
2 files changed, 10 insertions, 4 deletions
diff --git a/arch/x86/lib/delay_32.c b/arch/x86/lib/delay_32.c
index 952e7a89c2a..aad9d95469d 100644
--- a/arch/x86/lib/delay_32.c
+++ b/arch/x86/lib/delay_32.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/preempt.h>
#include <linux/delay.h>
#include <asm/processor.h>
@@ -42,11 +43,13 @@ static void delay_tsc(unsigned long loops)
{
unsigned long bclock, now;
+ preempt_disable(); /* TSC's are per-cpu */
rdtscl(bclock);
do {
rep_nop();
rdtscl(now);
} while ((now-bclock) < loops);
+ preempt_enable();
}
/*
diff --git a/arch/x86/lib/delay_64.c b/arch/x86/lib/delay_64.c
index 0ebbfb9e7c7..45cdd3fbd91 100644
--- a/arch/x86/lib/delay_64.c
+++ b/arch/x86/lib/delay_64.c
@@ -10,7 +10,9 @@
#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/preempt.h>
#include <linux/delay.h>
+
#include <asm/delay.h>
#include <asm/msr.h>
@@ -27,14 +29,15 @@ int read_current_timer(unsigned long *timer_value)
void __delay(unsigned long loops)
{
unsigned bclock, now;
-
+
+ preempt_disable(); /* TSC's are pre-cpu */
rdtscl(bclock);
- do
- {
+ do {
rep_nop();
rdtscl(now);
}
- while((now-bclock) < loops);
+ while ((now-bclock) < loops);
+ preempt_enable();
}
EXPORT_SYMBOL(__delay);