[tip:x86/asm] x86/asm/entry/64: Fold identical code paths

From: tip-bot for Jan Beulich
Date: Tue Jun 02 2015 - 04:26:39 EST


Commit-ID: 2f63b9db7260beba3c19d66d6c11b0b78ea84a8c
Gitweb: http://git.kernel.org/tip/2f63b9db7260beba3c19d66d6c11b0b78ea84a8c
Author: Jan Beulich <JBeulich@xxxxxxxx>
AuthorDate: Mon, 1 Jun 2015 13:03:59 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 2 Jun 2015 10:10:09 +0200

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@xxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/556C664F020000780007FB64@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/entry_64.S | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index b84cec5..4ad79e9 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 */
--
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