linux/arch/csky/include/asm/vdso/processor.h, branch masterMirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
https://git.shady.money/linux/atom?h=master2024-11-02T11:37:32Zcsky/vdso: Remove gettimeofday() and friends from VDSO2024-11-02T11:37:32ZThomas Weißschuhthomas.weissschuh@linutronix.de2024-10-10T07:01:03Zurn:sha1:cf12469600fe50aa4ce720645fd31e97a5d2e87b
The time-related VDSO functionality was introduced in 2021 in
commit 87f3248cdb9a ("csky: Reconstruct VDSO framework") and
commit 0d3b051adbb7 ("csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO").
However the corresponding aux-vector entry AT_SYSINFO_EHDR was never
wired up, making these functions impossible to test or use.
The VDSO itself is kept as it also provides rt_sigreturn which is
exposed differently to userspace.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-1-b64f0842d512@linutronix.de
csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO2021-02-27T08:35:09ZGuo Renguoren@linux.alibaba.com2021-01-17T15:38:18Zurn:sha1:0d3b051adbb72ed81956447d0d1e54d5943ee6f5
It could help to reduce the latency of the time-related functions
in user space.
We have referenced arm's and riscv's implementation for the patch.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Vincent Chen <vincent.chen@sifive.com>
Cc: Arnd Bergmann <arnd@arndb.de>