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x86: add notrace annotations to vsyscall. 

Add the notrace annotations to the vsyscall functions - there we are
not in kernel context yet, so the tracer function cannot (and must not)
be called.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Steven Rostedt 2008-05-12 21:20:41 +02:00 committed by Thomas Gleixner
parent ffdc1a09ae
commit 23adec554a
4 changed files with 14 additions and 10 deletions
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3
arch/x86/kernel/vsyscall_64.c
View File

@ -42,7 +42,8 @@
#include <asm/topology.h>
#include <asm/vgtod.h>
#define __vsyscall(nr) __attribute__ ((unused,__section__(".vsyscall_" #nr)))
#define __vsyscall(nr) \
__attribute__ ((unused, __section__(".vsyscall_" #nr))) notrace
#define __syscall_clobber "r11","cx","memory"
/*

15
arch/x86/vdso/vclock_gettime.c
View File

@ -23,7 +23,7 @@
#define gtod vdso_vsyscall_gtod_data
static long vdso_fallback_gettime(long clock, struct timespec *ts)
notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
{
long ret;
asm("syscall" : "=a" (ret) :
@ -31,7 +31,7 @@ static long vdso_fallback_gettime(long clock, struct timespec *ts)
return ret;
}
static inline long vgetns(void)
notrace static inline long vgetns(void)
{
long v;
cycles_t (*vread)(void);
@ -40,7 +40,7 @@ static inline long vgetns(void)
return (v * gtod->clock.mult) >> gtod->clock.shift;
}
static noinline int do_realtime(struct timespec *ts)
notrace static noinline int do_realtime(struct timespec *ts)
{
unsigned long seq, ns;
do {
@ -54,7 +54,8 @@ static noinline int do_realtime(struct timespec *ts)
}
/* Copy of the version in kernel/time.c which we cannot directly access */
static void vset_normalized_timespec(struct timespec *ts, long sec, long nsec)
notrace static void
vset_normalized_timespec(struct timespec *ts, long sec, long nsec)
{
while (nsec >= NSEC_PER_SEC) {
nsec -= NSEC_PER_SEC;
@ -68,7 +69,7 @@ static void vset_normalized_timespec(struct timespec *ts, long sec, long nsec)
ts->tv_nsec = nsec;
}
static noinline int do_monotonic(struct timespec *ts)
notrace static noinline int do_monotonic(struct timespec *ts)
{
unsigned long seq, ns, secs;
do {
@ -82,7 +83,7 @@ static noinline int do_monotonic(struct timespec *ts)
return 0;
}
int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
notrace int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
{
if (likely(gtod->sysctl_enabled && gtod->clock.vread))
switch (clock) {
@ -96,7 +97,7 @@ int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
int clock_gettime(clockid_t, struct timespec *)
__attribute__((weak, alias("__vdso_clock_gettime")));
int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
{
long ret;
if (likely(gtod->sysctl_enabled && gtod->clock.vread)) {

3
arch/x86/vdso/vgetcpu.c
View File

@ -13,7 +13,8 @@
#include <asm/vgtod.h>
#include "vextern.h"
long __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
notrace long
__vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
{
unsigned int p;

3
include/asm-x86/vsyscall.h
View File

@ -24,7 +24,8 @@ enum vsyscall_num {
((unused, __section__ (".vsyscall_gtod_data"),aligned(16)))
#define __section_vsyscall_clock __attribute__ \
((unused, __section__ (".vsyscall_clock"),aligned(16)))
#define __vsyscall_fn __attribute__ ((unused,__section__(".vsyscall_fn")))
#define __vsyscall_fn \
__attribute__ ((unused, __section__(".vsyscall_fn"))) notrace
#define VGETCPU_RDTSCP 1
#define VGETCPU_LSL 2