From: Jan Beulich <JBeulich@suse.com>
Date: Mon, 1 Jun 2015 12:03:59 +0000 (+0100)
Subject: x86/asm/entry/64: Fold identical code paths
X-Git-Tag: v4.2-rc1~166^2^2~8^2~21
X-Git-Url: http://git.cascardo.info/?a=commitdiff_plain;h=2f63b9db7260beba3c19d66d6c11b0b78ea84a8c;p=cascardo%2Flinux.git

x86/asm/entry/64: Fold identical code paths

retint_kernel doesn't require %rcx to be pointing to thread info
(anymore?), and the code on the two alternative paths is - not
really surprisingly - identical.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
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/556C664F020000780007FB64@mail.emea.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index b84cec50c8cf..4ad79e946f5a 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -615,7 +615,7 @@ ret_from_intr:
 	testb	$3, CS(%rsp)
 	jz	retint_kernel
 	/* Interrupt came from user space */
-
+retint_user:
 	GET_THREAD_INFO(%rcx)
 	/*
 	 * %rcx: thread info. Interrupts off.
@@ -1194,15 +1194,9 @@ ENTRY(error_exit)
 	RESTORE_EXTRA_REGS
 	DISABLE_INTERRUPTS(CLBR_NONE)
 	TRACE_IRQS_OFF
-	GET_THREAD_INFO(%rcx)
 	testl %eax,%eax
 	jnz retint_kernel
-	LOCKDEP_SYS_EXIT_IRQ
-	movl TI_flags(%rcx),%edx
-	movl $_TIF_WORK_MASK,%edi
-	andl %edi,%edx
-	jnz retint_careful
-	jmp retint_swapgs
+	jmp retint_user
 END(error_exit)
 
 /* Runs on exception stack */