From d41dcee41c67a15e77e6a0989d7f871aa0ff3c92 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Thu, 14 Jul 2022 12:20:19 +0200
Subject: [PATCH] um: Add missing apply_returns()

Implement apply_returns() stub for UM, just like all the other patching
routines.

Change-Id: I8aaed955019480f0b5a7a7330a13c7200d48365c
Fixes: 15e67227c49a ("x86: Undo return-thunk damage")
Reported-by: Randy Dunlap <rdunlap@infradead.org)
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/Ys%2Ft45l%2FgarIrD0u@worktop.programming.kicks-ass.net
Git-Repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Git-Commit: 564d998106397394b6aad260f219b882b3347e62
Signed-off-by: Maria Yu <quic_aiquny@quicinc.com>
---
 arch/um/kernel/um_arch.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 0760e24f2eba..9838967d0b2f 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -432,6 +432,10 @@ void apply_retpolines(s32 *start, s32 *end)
 {
 }
 
+void apply_returns(s32 *start, s32 *end)
+{
+}
+
 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
 {
 }