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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-03-11 15:20:05 +0300 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-03-24 05:47:27 +0300 |
| commit | 9a3719341a9b5d2f5a2e590497346b61cf3462a5 (patch) | |
| tree | f9e34b1ab0afea5c867a829cfeb7e6291a4ffc64 /arch/powerpc/kernel | |
| parent | c5785f9e1c1c07c791fdc471f5c7fda4a5855b0c (diff) | |
| download | linux-9a3719341a9b5d2f5a2e590497346b61cf3462a5.tar.xz | |
powerpc: Make sysfs code use smp_call_function_single
Impact: performance improvement
This fixes 'powerpc: avoid cpumask games in arch/powerpc/kernel/sysfs.c'
which talked about using smp_call_function_single, but actually used
work_on_cpu (an older version of the patch).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/sysfs.c | 31 |
1 files changed, 6 insertions, 25 deletions
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c index 4a2ee08af6a7..e6cd6c990c25 100644 --- a/arch/powerpc/kernel/sysfs.c +++ b/arch/powerpc/kernel/sysfs.c @@ -134,36 +134,16 @@ void ppc_enable_pmcs(void) } EXPORT_SYMBOL(ppc_enable_pmcs); -#if defined(CONFIG_6xx) || defined(CONFIG_PPC64) -/* XXX convert to rusty's on_one_cpu */ -static unsigned long run_on_cpu(unsigned long cpu, - unsigned long (*func)(unsigned long), - unsigned long arg) -{ - cpumask_t old_affinity = current->cpus_allowed; - unsigned long ret; - - /* should return -EINVAL to userspace */ - if (set_cpus_allowed(current, cpumask_of_cpu(cpu))) - return 0; - - ret = func(arg); - - set_cpus_allowed(current, old_affinity); - - return ret; -} -#endif #define SYSFS_PMCSETUP(NAME, ADDRESS) \ -static unsigned long read_##NAME(unsigned long junk) \ +static void read_##NAME(void *val) \ { \ - return mfspr(ADDRESS); \ + mtspr(ADDRESS, *(unsigned long *)val); \ } \ static unsigned long write_##NAME(unsigned long val) \ { \ ppc_enable_pmcs(); \ - mtspr(ADDRESS, val); \ + mtspr(ADDRESS, *(unsigned long *)val); \ return 0; \ } \ static ssize_t show_##NAME(struct sys_device *dev, \ @@ -171,7 +151,8 @@ static ssize_t show_##NAME(struct sys_device *dev, \ char *buf) \ { \ struct cpu *cpu = container_of(dev, struct cpu, sysdev); \ - unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \ + unsigned long val; \ + smp_call_function_single(cpu->sysdev.id, read_##NAME, &val, 1); \ return sprintf(buf, "%lx\n", val); \ } \ static ssize_t __used \ @@ -183,7 +164,7 @@ static ssize_t __used \ int ret = sscanf(buf, "%lx", &val); \ if (ret != 1) \ return -EINVAL; \ - run_on_cpu(cpu->sysdev.id, write_##NAME, val); \ + smp_call_function_single(cpu->sysdev.id, write_##NAME, &val, 1); \ return count; \ } |