This is a note to let you know that I've just added the patch titled
ARC: unbork 5.11 bootup: fix snafu in _TIF_NOTIFY_SIGNAL handling
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arc-unbork-5.11-bootup-fix-snafu-in-_tif_notify_signal-handling.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ec98073a6e28f5b0e962b801d1a706479a770e71 Mon Sep 17 00:00:00 2001
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Date: Wed, 6 Jan 2021 12:34:36 -0800
Subject: ARC: unbork 5.11 bootup: fix snafu in _TIF_NOTIFY_SIGNAL handling
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
[ Upstream commit bb12433bf56e76789c6b08b36c546f745a6aa6e1 ]
Linux 5.11.rcX was failing to boot on ARC HSDK board. Turns out we have
a couple of issues, this being the first one, and I'm to blame as I
didn't pay attention during review.
TIF_NOTIFY_SIGNAL support requires checking multiple TIF_* bits in
kernel return code path. Old code only needed to check a single bit so
BBIT0 <TIF_SIGPENDING> worked. New code needs to check multiple bits so
AND <bit-mask> instruction. So needs to use bit mask variant _TIF_SIGPENDING
Cc: Jens Axboe <axboe@xxxxxxxxx>
Fixes: 53855e12588743ea128 ("arc: add support for TIF_NOTIFY_SIGNAL")
Link: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/34
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arc/kernel/entry.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -308,7 +308,7 @@ resume_user_mode_begin:
mov r0, sp ; pt_regs for arg to do_signal()/do_notify_resume()
GET_CURR_THR_INFO_FLAGS r9
- and.f 0, r9, TIF_SIGPENDING|TIF_NOTIFY_SIGNAL
+ and.f 0, r9, _TIF_SIGPENDING|_TIF_NOTIFY_SIGNAL
bz .Lchk_notify_resume
; Normal Trap/IRQ entry only saves Scratch (caller-saved) regs
Patches currently in stable-queue which might be from vgupta@xxxxxxxxxxxx are
queue-5.10/arc-unbork-5.11-bootup-fix-snafu-in-_tif_notify_signal-handling.patch
queue-5.10/arc-add-support-for-tif_notify_signal.patch
