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Fix: Disable sys_membarrier when nohz_full is enabled

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am: c0ef1f537a

Change-Id: I3650becd64c5156d24dee601990d48c68057e81d
This commit is contained in:
Mathieu Desnoyers 2017-03-12 08:17:10 +00:00 • committed by android-build-merger
commit cd5e303ecd
1 changed files with 4 additions and 0 deletions
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4
kernel/membarrier.c
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@ -16,6 +16,7 @@
#include <linux/syscalls.h>
#include <linux/membarrier.h>
#include <linux/tick.h>
/*
* Bitmask made from a "or" of all commands within enum membarrier_cmd,
@ -51,6 +52,9 @@
*/
SYSCALL_DEFINE2(membarrier, int, cmd, int, flags)
{
/* MEMBARRIER_CMD_SHARED is not compatible with nohz_full. */
if (tick_nohz_full_enabled())
return -ENOSYS;
if (unlikely(flags))
return -EINVAL;
switch (cmd) {