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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2016-01-05 13:29:38 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-01-11 13:01:24 +0100
commit249c543b97e1409b13fb9539b2f880e58ddd87cf (patch)
tree956a0719238b56b8dffa3877d3fe3eb5c27df9f4 /arch/s390/kernel/asm-offsets.c
parent0dab3e0e59ac3692e2f95cb37ba17d5dfb3d1e5f (diff)
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/kernel/asm-offsets.c')
-rw-r--r--arch/s390/kernel/asm-offsets.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index d5916ef9c619..53bbc9e8b281 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -80,6 +80,8 @@ int main(void)
OFFSET(__VDSO_TK_SHIFT, vdso_data, tk_shift);
OFFSET(__VDSO_ECTG_BASE, vdso_per_cpu_data, ectg_timer_base);
OFFSET(__VDSO_ECTG_USER, vdso_per_cpu_data, ectg_user_time);
+ OFFSET(__VDSO_CPU_NR, vdso_per_cpu_data, cpu_nr);
+ OFFSET(__VDSO_NODE_ID, vdso_per_cpu_data, node_id);
BLANK();
/* constants used by the vdso */
DEFINE(__CLOCK_REALTIME, CLOCK_REALTIME);