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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/x86/vdso/vgetcpu.c |
Initial import
Diffstat (limited to 'arch/x86/vdso/vgetcpu.c')
-rw-r--r-- | arch/x86/vdso/vgetcpu.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86/vdso/vgetcpu.c b/arch/x86/vdso/vgetcpu.c new file mode 100644 index 000000000..8ec3d1f4c --- /dev/null +++ b/arch/x86/vdso/vgetcpu.c @@ -0,0 +1,28 @@ +/* + * Copyright 2006 Andi Kleen, SUSE Labs. + * Subject to the GNU Public License, v.2 + * + * Fast user context implementation of getcpu() + */ + +#include <linux/kernel.h> +#include <linux/getcpu.h> +#include <linux/time.h> +#include <asm/vgtod.h> + +notrace long +__vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) +{ + unsigned int p; + + p = __getcpu(); + + if (cpu) + *cpu = p & VGETCPU_CPU_MASK; + if (node) + *node = p >> 12; + return 0; +} + +long getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache) + __attribute__((weak, alias("__vdso_getcpu"))); |