linux-kernel - [PATCH V2 40/41] x86/entry: Remove save_ret from PUSH_AND_CLEAR

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Date:   Sun, 26 Sep 2021 23:08:37 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH V2 40/41] x86/entry: Remove save_ret from PUSH_AND_CLEAR_REGS

From: Lai Jiangshan <laijs@...ux.alibaba.com>

PUSH_AND_CLEAR_REGS is never used with save_ret anymore.

Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 arch/x86/entry/calling.h | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/arch/x86/entry/calling.h b/arch/x86/entry/calling.h
index d42012fc694d..6f9de1c6da73 100644
--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -63,15 +63,9 @@ For 32-bit we have the following conventions - kernel is built with
  * for assembly code:
  */
 
-.macro PUSH_REGS rdx=%rdx rax=%rax save_ret=0
-	.if \save_ret
-	pushq	%rsi		/* pt_regs->si */
-	movq	8(%rsp), %rsi	/* temporarily store the return address in %rsi */
-	movq	%rdi, 8(%rsp)	/* pt_regs->di (overwriting original return address) */
-	.else
+.macro PUSH_REGS rdx=%rdx rax=%rax
 	pushq   %rdi		/* pt_regs->di */
 	pushq   %rsi		/* pt_regs->si */
-	.endif
 	pushq	\rdx		/* pt_regs->dx */
 	pushq   %rcx		/* pt_regs->cx */
 	pushq   \rax		/* pt_regs->ax */
@@ -86,10 +80,6 @@ For 32-bit we have the following conventions - kernel is built with
 	pushq	%r14		/* pt_regs->r14 */
 	pushq	%r15		/* pt_regs->r15 */
 	UNWIND_HINT_REGS
-
-	.if \save_ret
-	pushq	%rsi		/* return address on top of stack */
-	.endif
 .endm
 
 .macro CLEAR_REGS
@@ -114,8 +104,8 @@ For 32-bit we have the following conventions - kernel is built with
 
 .endm
 
-.macro PUSH_AND_CLEAR_REGS rdx=%rdx rax=%rax save_ret=0
-	PUSH_REGS rdx=\rdx, rax=\rax, save_ret=\save_ret
+.macro PUSH_AND_CLEAR_REGS rdx=%rdx rax=%rax
+	PUSH_REGS rdx=\rdx, rax=\rax
 	CLEAR_REGS
 .endm
 
-- 
2.19.1.6.gb485710b