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x86/fault: Document the locking in the fault_signal_pending() path 

If fault_signal_pending() returns true, then the core mm has unlocked the
mm for us.  Add a comment to help future readers of this code.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/c56de3d103f40e6304437b150aa7b215530d23f7.1612924255.git.luto@kernel.org
This commit is contained in:
Andy Lutomirski 2021-02-09 18:33:37 -08:00 committed by Borislav Petkov
parent f42a40fd53
commit ef2544fb3f
1 changed files with 4 additions and 1 deletions
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5
arch/x86/mm/fault.c
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@ -1380,8 +1380,11 @@ good_area:
*/
fault = handle_mm_fault(vma, address, flags, regs);
/* Quick path to respond to signals */
if (fault_signal_pending(fault, regs)) {
/*
* Quick path to respond to signals. The core mm code
* has unlocked the mm for us if we get here.
*/
if (!user_mode(regs))
no_context(regs, error_code, address, SIGBUS,
BUS_ADRERR);