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 b84cec5..4ad79e9 100644 (file)
--- 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 */