linux-kernel - [tip: x86/core] x86/putuser: Provide room for padding

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Message-ID: <166601843256.401.5392178087541775099.tip-bot2@tip-bot2>
Date:   Mon, 17 Oct 2022 14:53:52 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] x86/putuser: Provide room for padding

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

Commit-ID:     cb855971d717a2dd752241f66fedad9dc178388c
Gitweb:        https://git.kernel.org/tip/cb855971d717a2dd752241f66fedad9dc178388c
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Thu, 15 Sep 2022 13:11:16 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 17 Oct 2022 16:41:10 +02:00

x86/putuser: Provide room for padding

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20220915111146.746429822@infradead.org
---
 arch/x86/lib/putuser.S | 62 ++++++++++++++++++++++++++++++++---------
 1 file changed, 49 insertions(+), 13 deletions(-)

diff --git a/arch/x86/lib/putuser.S b/arch/x86/lib/putuser.S
index b7dfd60..3212522 100644
--- a/arch/x86/lib/putuser.S
+++ b/arch/x86/lib/putuser.S
@@ -47,8 +47,6 @@ SYM_FUNC_START(__put_user_1)
 	LOAD_TASK_SIZE_MINUS_N(0)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
-SYM_INNER_LABEL(__put_user_nocheck_1, SYM_L_GLOBAL)
-	ENDBR
 	ASM_STAC
 1:	movb %al,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -56,54 +54,87 @@ SYM_INNER_LABEL(__put_user_nocheck_1, SYM_L_GLOBAL)
 	RET
 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
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_nocheck_1)
 EXPORT_SYMBOL(__put_user_nocheck_1)
 
 SYM_FUNC_START(__put_user_2)
 	LOAD_TASK_SIZE_MINUS_N(1)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
-SYM_INNER_LABEL(__put_user_nocheck_2, SYM_L_GLOBAL)
-	ENDBR
 	ASM_STAC
-2:	movw %ax,(%_ASM_CX)
+3:	movw %ax,(%_ASM_CX)
 	xor %ecx,%ecx
 	ASM_CLAC
 	RET
 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
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_nocheck_2)
 EXPORT_SYMBOL(__put_user_nocheck_2)
 
 SYM_FUNC_START(__put_user_4)
 	LOAD_TASK_SIZE_MINUS_N(3)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
-SYM_INNER_LABEL(__put_user_nocheck_4, SYM_L_GLOBAL)
-	ENDBR
 	ASM_STAC
-3:	movl %eax,(%_ASM_CX)
+5:	movl %eax,(%_ASM_CX)
 	xor %ecx,%ecx
 	ASM_CLAC
 	RET
 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
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_nocheck_4)
 EXPORT_SYMBOL(__put_user_nocheck_4)
 
 SYM_FUNC_START(__put_user_8)
 	LOAD_TASK_SIZE_MINUS_N(7)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
-SYM_INNER_LABEL(__put_user_nocheck_8, SYM_L_GLOBAL)
-	ENDBR
 	ASM_STAC
-4:	mov %_ASM_AX,(%_ASM_CX)
+7:	mov %_ASM_AX,(%_ASM_CX)
 #ifdef CONFIG_X86_32
-5:	movl %edx,4(%_ASM_CX)
+8:	movl %edx,4(%_ASM_CX)
 #endif
 	xor %ecx,%ecx
 	ASM_CLAC
 	RET
 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
+10:	movl %edx,4(%_ASM_CX)
+#endif
+	xor %ecx,%ecx
+	ASM_CLAC
+	RET
+SYM_FUNC_END(__put_user_nocheck_8)
 EXPORT_SYMBOL(__put_user_nocheck_8)
 
 SYM_CODE_START_LOCAL(.Lbad_put_user_clac)
@@ -117,6 +148,11 @@ SYM_CODE_END(.Lbad_put_user_clac)
 	_ASM_EXTABLE_UA(2b, .Lbad_put_user_clac)
 	_ASM_EXTABLE_UA(3b, .Lbad_put_user_clac)
 	_ASM_EXTABLE_UA(4b, .Lbad_put_user_clac)
-#ifdef CONFIG_X86_32
 	_ASM_EXTABLE_UA(5b, .Lbad_put_user_clac)
+	_ASM_EXTABLE_UA(6b, .Lbad_put_user_clac)
+	_ASM_EXTABLE_UA(7b, .Lbad_put_user_clac)
+	_ASM_EXTABLE_UA(9b, .Lbad_put_user_clac)
+#ifdef CONFIG_X86_32
+	_ASM_EXTABLE_UA(8b, .Lbad_put_user_clac)
+	_ASM_EXTABLE_UA(10b, .Lbad_put_user_clac)
 #endif