kernel.git/arch/s390/kernel/vdso64, branch linux-3.18.y

s390/vdso: add missing FORCE to build targets

2018-11-27T15:05:36Z

[ Upstream commit b44b136a3773d8a9c7853f8df716bd1483613cbb ] According to Documentation/kbuild/makefiles.txt all build targets using if_changed should use FORCE as well. Add missing FORCE to make sure vdso targets are rebuild properly when not just immediate prerequisites have changed but also when build command differs. Reviewed-by: Philipp Rudo Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky Signed-off-by: Sasha Levin

s390/vdso: fix stack corruption

2014-10-27T12:27:02Z

The kernel provided vdso functions do not get a stack frame from the calling function and therefore may not change the stack contents, unless they allocate space on their own. This problem was exposed with 070b7be633dc "s390/vdso: replace stck with stcke" which writes 16 bytes instead of 8 bytes into the stack frame. These additional 8 bytes however were indeed used by the caller (glibc) to save data and therefore this data was corrupted by the vdso code. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/vdso: add vdso support for coarse clocks

2014-09-09T06:53:27Z

Add CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE optimization to the 64-bit and 31-bit vdso. Signed-off-by: Martin Schwidefsky

s390/vdso: replace stck with stcke

2014-09-09T06:53:27Z

If gettimeofday / clock_gettime are called multiple times in a row the STCK instruction will stall until a difference in the result is visible. This unnecessarily slows down the vdso calls, use stcke instead of stck to get rid of the stall. Signed-off-by: Martin Schwidefsky

s390/vdso: remove NULL pointer check from clock_gettime

2014-09-01T07:56:29Z

The explicit NULL pointer check on the timespec argument is only required for clock_getres but not for clock_gettime. Signed-off-by: Martin Schwidefsky

s390/time,vdso: fix clock_gettime for CLOCK_MONOTONIC

2013-12-02T17:15:25Z

With git commit 79c74ecbebf76732f91b82a62ce7fc8a88326962 "s390/time,vdso: convert to the new update_vsyscall interface" the new update_vsyscall function already does the sum of xtime and wall_to_monotonic. The old update_vsyscall function only copied the wall_to_monotonic offset. The vdso code needs to be modified to take this into consideration. Signed-off-by: Martin Schwidefsky

s390/vdso: ectg gettime support for CLOCK_THREAD_CPUTIME_ID

2013-12-02T14:31:10Z

The code to use the ECTG instruction to calculate the cputime for the current thread is currently used only for the per-thread CPU-clock with the clockid -2 (PID=0, VIRT=1). Use the same code for the clockid CLOCK_THREAD_CPUTIME_ID to speed up the more common clockid as well. Reported-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/time,vdso: convert to the new update_vsyscall interface

2013-11-25T08:15:39Z

Switch to the improved update_vsyscall interface that provides sub-nanosecond precision for gettimeofday and clock_gettime. Signed-off-by: Martin Schwidefsky

s390: add various .gitignore files.

2012-05-16T12:42:41Z

Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] vdso: disable gcov profiling

2011-05-23T08:24:29Z

The concepts of VDSO and gcov-based profiling don't mix: the former includes kernel-provided code running in userspace, the latter adds instructions that modify counters in kernel data segments. On s390 this has not been a problem so far due to VDSO code being written in all-assembler which is exempt from gcov-based profiling. This could change in the future, so disable profiling excplicitly for VDSO code. Signed-off-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky