FAILED: patch "[PATCH] riscv: signal: fix missing prototype warning" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b5c3aca86d2698c4850b6ee8b341938025d2780c Mon Sep 17 00:00:00 2001
From: Conor Dooley <[email protected]>
Date: Sun, 14 Aug 2022 15:12:37 +0100
Subject: [PATCH] riscv: signal: fix missing prototype warning

Fix the warning:
arch/riscv/kernel/signal.c:316:27: warning: no previous prototype for function 'do_notify_resume' [-Wmissing-prototypes] asmlinkage __visible void do_notify_resume(struct pt_regs *regs,

All other functions in the file are static & none of the existing headers stood out as an obvious location. Create signal.h to hold the declaration.

new file mode 100644
index 000000000000..532c29ef0376
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_SIGNAL_H
+#define __ASM_SIGNAL_H
+
+#include <uapi/asm/signal.h>
+#include <uapi/asm/ptrace.h>
+
+asmlinkage __visible
+void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags);
+
+#endif

index 38b05ca6fe66..5a2de6b6f882 100644
@@ -15,6 +15,7 @@
 
 #include <asm/ucontext.h>
 #include <asm/vdso.h>
+#include <asm/signal.h>
 #include <asm/signal32.h>
 #include <asm/switch_to.h>
 #include <asm/csr.h>