[PATCH] x86-64/entry: fold identical code paths

[Jan Beulich]

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@xxxxxxxxxx>
---
 arch/x86/kernel/entry_64.S |   10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

--- 4.1-rc6/arch/x86/kernel/entry_64.S
+++ 4.1-rc6-x86_64-entry-fold-code/arch/x86/kernel/entry_64.S
@@ -744,7 +744,7 @@ ret_from_intr:
 	testl $3,CS(%rsp)
 	je retint_kernel
 	/* Interrupt came from user space */
-
+retint_user:
 	GET_THREAD_INFO(%rcx)
 	/*
 	 * %rcx: thread info. Interrupts off.
@@ -1380,15 +1380,9 @@ ENTRY(error_exit)
 	RESTORE_EXTRA_REGS
 	DISABLE_INTERRUPTS(CLBR_NONE)
 	TRACE_IRQS_OFF
-	GET_THREAD_INFO(%rcx)
 	testl %eax,%eax
 	jne 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
 	CFI_ENDPROC
 END(error_exit)
 



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