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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-01-05 12:29:38 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-01-11 12:01:24 (GMT) |
| commit | 249c543b97e1409b13fb9539b2f880e58ddd87cf (patch) | |
| tree | 956a0719238b56b8dffa3877d3fe3eb5c27df9f4 /arch/s390/include/asm/vdso.h | |
| parent | 0dab3e0e59ac3692e2f95cb37ba17d5dfb3d1e5f (diff) | |
| download | linux-249c543b97e1409b13fb9539b2f880e58ddd87cf.tar.xz | |
s390/vdso: optimize getcpu system call
Add the CPU number to the per-cpu vdso data page and add the
__kernel_getcpu function to the vdso object to retrieve the
CPU number in user space.
Suggested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/vdso.h')
| -rw-r--r-- | arch/s390/include/asm/vdso.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/include/asm/vdso.h b/arch/s390/include/asm/vdso.h index f9b02d3..d0a2dbf 100644 --- a/arch/s390/include/asm/vdso.h +++ b/arch/s390/include/asm/vdso.h @@ -38,6 +38,8 @@ struct vdso_data { struct vdso_per_cpu_data { __u64 ectg_timer_base; __u64 ectg_user_time; + __u32 cpu_nr; + __u32 node_id; }; extern struct vdso_data *vdso_data; |