linux-kernel - [tip: x86/urgent] x86/ibt: Avoid duplicate ENDBR in __put_user

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Message-ID: <169453408814.27769.10306579473210020099.tip-bot2@tip-bot2>
Date:   Tue, 12 Sep 2023 15:54:48 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     David Kaplan <David.Kaplan@....com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/ibt: Avoid duplicate ENDBR in __put_user_nocheck*()

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     7575e5a35267983dcbeb1e0d3a49d21ae3cf0b82
Gitweb:        https://git.kernel.org/tip/7575e5a35267983dcbeb1e0d3a49d21ae3cf0b82
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Wed, 02 Aug 2023 12:55:47 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 12 Sep 2023 17:51:24 +02:00

x86/ibt: Avoid duplicate ENDBR in __put_user_nocheck*()

Commit cb855971d717 ("x86/putuser: Provide room for padding") changed
__put_user_nocheck_*() into proper functions but failed to note that
SYM_FUNC_START() already provides ENDBR, rendering the explicit ENDBR
superfluous.

Fixes: cb855971d717 ("x86/putuser: Provide room for padding")
Reported-by: David Kaplan <David.Kaplan@....com>
Reviewed-by: Andrew Cooper <andrew.cooper3@...rix.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20230802110323.086971726@infradead.org
---
 arch/x86/lib/putuser.S | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/x86/lib/putuser.S b/arch/x86/lib/putuser.S
index 1451e0c..235bbda 100644
--- a/arch/x86/lib/putuser.S
+++ b/arch/x86/lib/putuser.S
@@ -56,7 +56,6 @@ SYM_FUNC_END(__put_user_1)
 EXPORT_SYMBOL(__put_user_1)
 
 SYM_FUNC_START(__put_user_nocheck_1)
-	ENDBR
 	ASM_STAC
 2:	movb %al,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -76,7 +75,6 @@ SYM_FUNC_END(__put_user_2)
 EXPORT_SYMBOL(__put_user_2)
 
 SYM_FUNC_START(__put_user_nocheck_2)
-	ENDBR
 	ASM_STAC
 4:	movw %ax,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -96,7 +94,6 @@ SYM_FUNC_END(__put_user_4)
 EXPORT_SYMBOL(__put_user_4)
 
 SYM_FUNC_START(__put_user_nocheck_4)
-	ENDBR
 	ASM_STAC
 6:	movl %eax,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -119,7 +116,6 @@ SYM_FUNC_END(__put_user_8)
 EXPORT_SYMBOL(__put_user_8)
 
 SYM_FUNC_START(__put_user_nocheck_8)
-	ENDBR
 	ASM_STAC
 9:	mov %_ASM_AX,(%_ASM_CX)
 #ifdef CONFIG_X86_32