Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Andy Lutomirski c4f9094070 membarrier: Explicitly sync remote cores when SYNC_CORE is requested ... commit 758c9373d84168dc7d039cf85a0e920046b17b41 upstream. membarrier() does not explicitly sync_core() remote CPUs; instead, it relies on the assumption that an IPI will result in a core sync. On x86, this may be true in practice, but it's not architecturally reliable. In particular, the SDM and APM do not appear to guarantee that interrupt delivery is serializing. While IRET does serialize, IPI return can schedule, thereby switching to another task in the same mm that was sleeping in a syscall. The new task could then SYSRET back to usermode without ever executing IRET. Make this more robust by explicitly calling sync_core_before_usermode() on remote cores. (This also helps people who search the kernel tree for instances of sync_core() and sync_core_before_usermode() -- one might be surprised that the core membarrier code doesn't currently show up in a such a search.) Fixes: 70216e18e5 ("membarrier: Provide core serializing command, *_SYNC_CORE") Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/776b448d5f7bd6b12690707f5ed67bcda7f1d427.1607058304.git.luto@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-12-21 13:27:07 +01:00
..
autogroup.c
autogroup.h
clock.c
completion.c
core.c	sched/features: Fix !CONFIG_JUMP_LABEL case	2020-10-29 09:58:00 +01:00
cpuacct.c
cpudeadline.c
cpudeadline.h
cpufreq.c
cpufreq_schedutil.c	sched/uclamp: Protect uclamp fast path code with static key	2020-09-03 11:26:49 +02:00
cpupri.c
cpupri.h
cputime.c
deadline.c	sched/deadline: Initialize ->dl_boosted	2020-06-30 15:37:02 -04:00
debug.c	sched/debug: Make sd->flags sysctl read-only	2020-07-09 09:37:50 +02:00
fair.c	sched/fair: Fix unthrottle_cfs_rq() for leaf_cfs_rq list	2020-12-08 10:40:24 +01:00
features.h
idle.c
isolation.c
loadavg.c	timers/nohz: Update NOHZ load in remote tick	2020-03-05 16:43:36 +01:00
Makefile
membarrier.c	membarrier: Explicitly sync remote cores when SYNC_CORE is requested	2020-12-21 13:27:07 +01:00
pelt.c
pelt.h
psi.c
rt.c	sched: Defend cfs and rt bandwidth quota against overflow	2020-06-22 09:31:07 +02:00
sched-pelt.h
sched.h	sched/features: Fix !CONFIG_JUMP_LABEL case	2020-10-29 09:58:00 +01:00
stats.c
stats.h
stop_task.c
swait.c
topology.c	sched: correct SD_flags returned by tl->sd_flags()	2020-08-19 08:15:54 +02:00
wait.c
wait_bit.c