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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	patches@lists.linux.dev,
	linux-alpha@vger.kernel.org,
	Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 5.10 34/63] alpha: add support for TIF_NOTIFY_SIGNAL
Date: Tue,  3 Jan 2023 09:14:04 +0100
Message-Id: <20230103081310.623361636@linuxfoundation.org>
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From: Jens Axboe <axboe@kernel.dk>

[ Upstream commit 5a9a8897c253a075805401d38d987ec1ac1824b6 ]

Wire up TIF_NOTIFY_SIGNAL handling for alpha.

Cc: linux-alpha@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/alpha/include/asm/thread_info.h |    2 ++
 arch/alpha/kernel/entry.S            |    2 +-
 arch/alpha/kernel/signal.c           |    2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

--- a/arch/alpha/include/asm/thread_info.h
+++ b/arch/alpha/include/asm/thread_info.h
@@ -62,6 +62,7 @@ register struct thread_info *__current_t
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_SYSCALL_AUDIT	4	/* syscall audit active */
+#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
 #define TIF_DIE_IF_KERNEL	9	/* dik recursion lock */
 #define TIF_MEMDIE		13	/* is terminating due to OOM killer */
 #define TIF_POLLING_NRFLAG	14	/* idle is polling for TIF_NEED_RESCHED */
@@ -71,6 +72,7 @@ register struct thread_info *__current_t
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
+#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
 /* Work to do on interrupt/exception return.  */
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -544,7 +544,7 @@ $ret_success:
 	.align	4
 	.type	work_pending, @function
 work_pending:
-	and	$17, _TIF_NOTIFY_RESUME | _TIF_SIGPENDING, $2
+	and	$17, _TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL, $2
 	bne	$2, $work_notifysig
 
 $work_resched:
--- a/arch/alpha/kernel/signal.c
+++ b/arch/alpha/kernel/signal.c
@@ -527,7 +527,7 @@ do_work_pending(struct pt_regs *regs, un
 			schedule();
 		} else {
 			local_irq_enable();
-			if (thread_flags & _TIF_SIGPENDING) {
+			if (thread_flags & (_TIF_SIGPENDING|_TIF_NOTIFY_SIGNAL)) {
 				do_signal(regs, r0, r19);
 				r0 = 0;
 			} else {