x86-64: Slightly shorten int_ret_from_sys_call

Testing for a return to ring 0 was necessary here solely because
of the branch out of ret_from_fork. That branch, however, can be
directed to retint_restore_args, and thus the test-and-branch
can be eliminated here.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/4ED4C7EE0200007800064028@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index faf8d5e..ab4b7ff 100644 (file)
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -411,7 +411,7 @@ ENTRY(ret_from_fork)
        RESTORE_REST
 
        testl $3, CS-ARGOFFSET(%rsp)            # from kernel_thread?
-       je   int_ret_from_sys_call
+       jz   retint_restore_args
 
        testl $_TIF_IA32, TI_flags(%rcx)        # 32-bit compat task needs IRET
        jnz  int_ret_from_sys_call
@@ -612,8 +612,6 @@ tracesys:
 GLOBAL(int_ret_from_sys_call)
        DISABLE_INTERRUPTS(CLBR_NONE)
        TRACE_IRQS_OFF
-       testl $3,CS-ARGOFFSET(%rsp)
-       je retint_restore_args
        movl $_TIF_ALLWORK_MASK,%edi
        /* edi: mask to check */
 GLOBAL(int_with_check)