linux-kernel - [PATCH] x86/asm/entry/64: Remove pointless jump to irq

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Message-Id: <2f2318653dbad284a59311f13f08cea71298fd7c.1433449436.git.luto@kernel.org>
Date:	Thu,  4 Jun 2015 13:24:29 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	x86@...nel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH] x86/asm/entry/64: Remove pointless jump to irq_return

INTERRUPT_RETURN turns into a jmp instruction.  There's no need for
extra indirection.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
 arch/x86/entry/entry_64.S | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index f7380ea75777..31770662b940 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -663,8 +663,6 @@ retint_kernel:
 restore_c_regs_and_iret:
 	RESTORE_C_REGS
 	REMOVE_PT_GPREGS_FROM_STACK 8
-
-irq_return:
 	INTERRUPT_RETURN
 
 ENTRY(native_iret)
@@ -1432,7 +1430,7 @@ nmi_restore:
 
 	/* Clear the NMI executing stack variable */
 	movq $0, 5*8(%rsp)
-	jmp irq_return
+	INTERRUPT_RETURN
 END(nmi)
 
 ENTRY(ignore_sysret)
-- 
2.4.2

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