From 754e15c5a6f9d24fda6b9ddc605515696d127817 Mon Sep 17 00:00:00 2001
From: Finix <yancw@info2soft.com>
Date: Fri, 18 Oct 2024 10:42:03 +0800
Subject: [PATCH] config: add HAVE_DEQUEUE_SIGNAL_3ARG_SIGINFO

The dequeue_signal API accepts siginfo_t as the third parameter instead of kernel_siginfo_t
in 4.18 and 4.19.

Signed-off-by: Finix <yancw@info2soft.com>
---
 config/kernel-kthread.m4         | 20 ++++++++++++++++++++
 module/os/linux/spl/spl-thread.c |  3 ++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/config/kernel-kthread.m4 b/config/kernel-kthread.m4
index 4d580efead6b..dab05d909407 100644
--- a/config/kernel-kthread.m4
+++ b/config/kernel-kthread.m4
@@ -16,6 +16,9 @@ AC_DEFUN([ZFS_AC_KERNEL_KTHREAD_COMPLETE_AND_EXIT], [
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_KTHREAD_DEQUEUE_SIGNAL], [
+	dnl #
+	dnl # Earlier than 4.20 API:
+	dnl # int dequeue_signal(struct task_struct *task, sigset_t *mask, siginfo_t *info);
 	dnl #
 	dnl # 5.17 API: enum pid_type * as new 4th dequeue_signal() argument,
 	dnl # 5768d8906bc23d512b1a736c1e198aa833a6daa4 ("signal: Requeue signals in the appropriate queue")
@@ -40,6 +43,12 @@ AC_DEFUN([ZFS_AC_KERNEL_KTHREAD_DEQUEUE_SIGNAL], [
 			    [dequeue_signal() takes a task argument])
 		], [
 			AC_MSG_RESULT(no)
+			AC_MSG_CHECKING([whether dequeue_signal() a siginfo argument])
+			ZFS_LINUX_TEST_RESULT([kthread_dequeue_signal_3arg_siginfo], [
+				AC_MSG_RESULT(yes)
+				AC_DEFINE(HAVE_DEQUEUE_SIGNAL_3ARG_SIGINFO, 1,
+				    [dequeue_signal() takes a siginfo argument])
+			])
 		])
 	])
 ])
@@ -56,6 +65,17 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_KTHREAD_COMPLETE_AND_EXIT], [
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_SRC_KTHREAD_DEQUEUE_SIGNAL], [
+	ZFS_LINUX_TEST_SRC([kthread_dequeue_signal_3arg_siginfo], [
+		#include <linux/sched/signal.h>
+	], [
+		struct task_struct *task = NULL;
+		sigset_t *mask = NULL;
+		siginfo_t *info = NULL;
+		int error __attribute__ ((unused));
+
+		error = dequeue_signal(task, mask, info);
+	])
+
 	ZFS_LINUX_TEST_SRC([kthread_dequeue_signal_3arg_task], [
 		#include <linux/sched/signal.h>
 	], [
diff --git a/module/os/linux/spl/spl-thread.c b/module/os/linux/spl/spl-thread.c
index 7f74d44f91ff..2841bf4cbfe8 100644
--- a/module/os/linux/spl/spl-thread.c
+++ b/module/os/linux/spl/spl-thread.c
@@ -171,7 +171,8 @@ issig(void)
 #if defined(HAVE_DEQUEUE_SIGNAL_4ARG)
 	enum pid_type __type;
 	if (dequeue_signal(current, &set, &__info, &__type) != 0) {
-#elif defined(HAVE_DEQUEUE_SIGNAL_3ARG_TASK)
+#elif defined(HAVE_DEQUEUE_SIGNAL_3ARG_TASK) || \
+	defined(HAVE_DEQUEUE_SIGNAL_3ARG_SIGINFO)
 	if (dequeue_signal(current, &set, &__info) != 0) {
 #else
 	enum pid_type __type;