The following commit has been merged into the x86/mm branch of tip: Commit-ID: ef2544fb3f6457b79fc73cea39dafd67ee0f2824 Gitweb: https://git.kernel.org/tip/ef2544fb3f6457b79fc73cea39dafd67ee0f2824 Author: Andy Lutomirski <l...@kernel.org> AuthorDate: Tue, 09 Feb 2021 18:33:37 -08:00 Committer: Borislav Petkov <b...@suse.de> CommitterDate: Wed, 10 Feb 2021 14:12:07 +01:00
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 <l...@kernel.org> Signed-off-by: Borislav Petkov <b...@suse.de> Link: https://lkml.kernel.org/r/c56de3d103f40e6304437b150aa7b215530d23f7.1612924255.git.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 3ffed00..013910b 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -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);
