x86/asm/entry: Check for syscall exit work with IRQs disabled

We currently have a race: if we're preempted during syscall
exit, we can fail to process syscall return work that is queued
up while we're preempted in ret_from_sys_call after checking
ti.flags.

Fix it by disabling interrupts before checking ti.flags.

Reported-by: Stefan Seyfried <[email protected]>
Reported-by: Takashi Iwai <[email protected]>
Signed-off-by: Andy Lutomirski <[email protected]>
Acked-by: Denys Vlasenko <[email protected]>
Cc: Jiri Kosina <[email protected]>
Cc: Tejun Heo <[email protected]>
Fixes: 96b6352c1271 ("x86_64, entry: Remove the syscall exit audit")
Link: http://lkml.kernel.org/r/189320d42b4d671df78c10555976bb10af1ffc75.1427137498.git.luto@kernel.org
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions