From 49253925c0be02ed4eb7d94a426731107dd8059d Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Tue, 27 Jan 2015 15:15:13 +0100 Subject: [PATCH] s390/vdso: fix clock_gettime for CLOCK_THREAD_CPUTIME_ID, -2 and -3 Git commit 8d8f2e18a6dbd3d09dd918788422e6ac8c878e96 "s390/vdso: ectg gettime support for CLOCK_THREAD_CPUTIME_ID" broke clock_gettime for CLOCK_THREAD_CPUTIME_ID. Git commit c742b31c03f37c5c499178f09f57381aa6c70131 "fast vdso implementation for CLOCK_THREAD_CPUTIME_ID" introduced the ECTG for clock id -2. Correct would have been clock id -3. Fix the whole mess, CLOCK_THREAD_CPUTIME_ID is based on CPUCLOCK_SCHED and can not be speed up by the vdso. A speedup is only available for clock id -3 which is CPUCLOCK_VIRT for the task currently running on the CPU. Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/vdso64/clock_gettime.S | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/s390/kernel/vdso64/clock_gettime.S b/arch/s390/kernel/vdso64/clock_gettime.S index 7699e735ae28..61541fb93dc6 100644 --- a/arch/s390/kernel/vdso64/clock_gettime.S +++ b/arch/s390/kernel/vdso64/clock_gettime.S @@ -25,9 +25,7 @@ __kernel_clock_gettime: je 4f cghi %r2,__CLOCK_REALTIME je 5f - cghi %r2,__CLOCK_THREAD_CPUTIME_ID - je 9f - cghi %r2,-2 /* Per-thread CPUCLOCK with PID=0, VIRT=1 */ + cghi %r2,-3 /* Per-thread CPUCLOCK with PID=0, VIRT=1 */ je 9f cghi %r2,__CLOCK_MONOTONIC_COARSE je 3f @@ -106,7 +104,7 @@ __kernel_clock_gettime: aghi %r15,16 br %r14 - /* CLOCK_THREAD_CPUTIME_ID for this thread */ + /* CPUCLOCK_VIRT for this thread */ 9: icm %r0,15,__VDSO_ECTG_OK(%r5) jz 12f ear %r2,%a4 -- 2.39.2