x86/asm/entry/64: Remove pointless jump to irq_return

commit 5ca6f70f387b4f82903037cc3c5488e2c97dcdbc upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 02c2eff..b32f346 100644 (file)
--- 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)