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.
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Signed-off-by: Andy Lutomirski <l...@kernel.org>
---
arch/x86/mm/fault.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 3ffed003f281..013910b7b93f 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1380,8 +1380,11 @@ void do_user_addr_fault(struct pt_regs *regs,
*/
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);
--
2.29.2
