lkml.org 
[lkml]   [2021]   [Jan]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 04/11] x86/fault: Document the locking in the fault_signal_pending() path
Date
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.hansen@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andy Lutomirski <luto@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 87d30daa5e0a..b52064920f0d 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1343,8 +1343,11 @@ 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
\
 
 \ /
  Last update: 2021-01-31 21:02    [W:0.144 / U:1.256 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site