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[PATCH] Define __raw_get_cpu_var and use it

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There are several instances of per_cpu(foo, raw_smp_processor_id()), which
is semantically equivalent to __get_cpu_var(foo) but without the warning
that smp_processor_id() can give if CONFIG_DEBUG_PREEMPT is enabled.  For
those architectures with optimized per-cpu implementations, namely ia64,
powerpc, s390, sparc64 and x86_64, per_cpu() turns into more and slower
code than __get_cpu_var(), so it would be preferable to use __get_cpu_var
on those platforms.

This defines a __raw_get_cpu_var(x) macro which turns into per_cpu(x,
raw_smp_processor_id()) on architectures that use the generic per-cpu
implementation, and turns into __get_cpu_var(x) on the architectures that
have an optimized per-cpu implementation.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul Mackerras 2006-06-25 05:47:14 -07:00 committed by Linus Torvalds
parent 6ceab8a936
commit bfe5d83419
11 changed files with 19 additions and 7 deletions
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2
include/asm-generic/percpu.h
View file

@ -14,6 +14,7 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id())
/* A macro to avoid #include hell... */
#define percpu_modcopy(pcpudst, src, size) \
@ -30,6 +31,7 @@ do { \
#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var) per_cpu__##var
#define __raw_get_cpu_var(var) per_cpu__##var
#endif /* SMP */

2
include/asm-ia64/percpu.h
View file

@ -42,6 +42,7 @@ DECLARE_PER_CPU(unsigned long, local_per_cpu_offset);
#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __ia64_per_cpu_var(local_per_cpu_offset)))
#define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __ia64_per_cpu_var(local_per_cpu_offset)))
extern void percpu_modcopy(void *pcpudst, const void *src, unsigned long size);
extern void setup_per_cpu_areas (void);
@ -51,6 +52,7 @@ extern void *per_cpu_init(void);
#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var) per_cpu__##var
#define __raw_get_cpu_var(var) per_cpu__##var
#define per_cpu_init() (__phys_per_cpu_start)
#endif /* SMP */

2
include/asm-powerpc/percpu.h
View file

@ -22,6 +22,7 @@
/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
#define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
/* A macro to avoid #include hell... */
#define percpu_modcopy(pcpudst, src, size) \
@ -41,6 +42,7 @@ extern void setup_per_cpu_areas(void);
#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var) per_cpu__##var
#define __raw_get_cpu_var(var) per_cpu__##var
#endif /* SMP */

2
include/asm-s390/percpu.h
View file

@ -40,6 +40,7 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
__typeof__(type) per_cpu__##name
#define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
#define __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
/* A macro to avoid #include hell... */
@ -57,6 +58,7 @@ do { \
__typeof__(type) per_cpu__##name
#define __get_cpu_var(var) __reloc_hide(var,0)
#define __raw_get_cpu_var(var) __reloc_hide(var,0)
#define per_cpu(var,cpu) __reloc_hide(var,0)
#endif /* SMP */

2
include/asm-sparc64/percpu.h
View file

@ -21,6 +21,7 @@ register unsigned long __local_per_cpu_offset asm("g5");
/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __local_per_cpu_offset))
#define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __local_per_cpu_offset))
/* A macro to avoid #include hell... */
#define percpu_modcopy(pcpudst, src, size) \
@ -37,6 +38,7 @@ do { \
#define per_cpu(var, cpu) (*((void)cpu, &per_cpu__##var))
#define __get_cpu_var(var) per_cpu__##var
#define __raw_get_cpu_var(var) per_cpu__##var
#endif /* SMP */

2
include/asm-x86_64/percpu.h
View file

@ -21,6 +21,7 @@
/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
#define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
/* A macro to avoid #include hell... */
#define percpu_modcopy(pcpudst, src, size) \
@ -40,6 +41,7 @@ extern void setup_per_cpu_areas(void);
#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var) per_cpu__##var
#define __raw_get_cpu_var(var) per_cpu__##var
#endif /* SMP */

4
kernel/hrtimer.c
View file

@ -576,7 +576,7 @@ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
memset(timer, 0, sizeof(struct hrtimer));
bases = per_cpu(hrtimer_bases, raw_smp_processor_id());
bases = __raw_get_cpu_var(hrtimer_bases);
if (clock_id == CLOCK_REALTIME && mode != HRTIMER_ABS)
clock_id = CLOCK_MONOTONIC;
@ -599,7 +599,7 @@ int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
{
struct hrtimer_base *bases;
bases = per_cpu(hrtimer_bases, raw_smp_processor_id());
bases = __raw_get_cpu_var(hrtimer_bases);
*tp = ktime_to_timespec(bases[which_clock].resolution);
return 0;

4
kernel/sched.c
View file

@ -4152,7 +4152,7 @@ EXPORT_SYMBOL(yield);
*/
void __sched io_schedule(void)
{
struct runqueue *rq = &per_cpu(runqueues, raw_smp_processor_id());
struct runqueue *rq = &__raw_get_cpu_var(runqueues);
atomic_inc(&rq->nr_iowait);
schedule();
@ -4163,7 +4163,7 @@ EXPORT_SYMBOL(io_schedule);
long __sched io_schedule_timeout(long timeout)
{
struct runqueue *rq = &per_cpu(runqueues, raw_smp_processor_id());
struct runqueue *rq = &__raw_get_cpu_var(runqueues);
long ret;
atomic_inc(&rq->nr_iowait);

2
kernel/softlockup.c
View file

@ -36,7 +36,7 @@ static struct notifier_block panic_block = {
void touch_softlockup_watchdog(void)
{
per_cpu(touch_timestamp, raw_smp_processor_id()) = jiffies;
__raw_get_cpu_var(touch_timestamp) = jiffies;
}
EXPORT_SYMBOL(touch_softlockup_watchdog);

2
kernel/timer.c
View file

@ -146,7 +146,7 @@ static void internal_add_timer(tvec_base_t *base, struct timer_list *timer)
void fastcall init_timer(struct timer_list *timer)
{
timer->entry.next = NULL;
timer->base = per_cpu(tvec_bases, raw_smp_processor_id());
timer->base = __raw_get_cpu_var(tvec_bases);
}
EXPORT_SYMBOL(init_timer);

2
net/ipv4/route.c
View file

@ -244,7 +244,7 @@ static unsigned int rt_hash_rnd;
static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
#define RT_CACHE_STAT_INC(field) \
(per_cpu(rt_cache_stat, raw_smp_processor_id()).field++)
(__raw_get_cpu_var(rt_cache_stat).field++)
static int rt_intern_hash(unsigned hash, struct rtable *rth,
struct rtable **res);