From 480ea71e661b2a48a8d28ea4327cafa666c267ff Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@kernel.org>
Date: Thu, 4 Jun 2015 13:24:29 -0700
Subject: [PATCH 1/7] 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@kernel.org>
Cc: <linux-kernel@vger.kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/2f2318653dbad284a59311f13f08cea71298fd7c.1433449436.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/entry_64.S | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 02c2eff..b32f346 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -793,8 +793,6 @@ retint_kernel:
restore_c_regs_and_iret:
RESTORE_C_REGS
REMOVE_PT_GPREGS_FROM_STACK 8
-
-irq_return:
INTERRUPT_RETURN
ENTRY(native_iret)
@@ -1640,7 +1638,7 @@ nmi_restore:
/* Clear the NMI executing stack variable */
movq $0, 5*8(%rsp)
- jmp irq_return
+ INTERRUPT_RETURN
CFI_ENDPROC
END(nmi)
--
2.4.3