linux-kernel - [PATCH 5.15 069/244] um: Add missing apply

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Date:   Tue, 23 Aug 2022 10:23:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Richard Weinberger <richard@....at>
Subject: [PATCH 5.15 069/244] um: Add missing apply_returns()

From: Peter Zijlstra <peterz@...radead.org>

commit 637285e7f8d6da70a70c64e7895cb0672357a1f7 upstream.

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

Fixes: 15e67227c49a ("x86: Undo return-thunk damage")
Reported-by: Randy Dunlap <rdunlap@...radead.org)
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/um/kernel/um_arch.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -437,6 +437,10 @@ void apply_returns(s32 *start, s32 *end)
 {
 }
 
+void apply_returns(s32 *start, s32 *end)
+{
+}
+
 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
 {
 }