From 70ea6855d368588a7f1b0242ab83ca6fe2e2ff16 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Tue, 29 Nov 2011 10:54:22 +0000 Subject: [PATCH] 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 Reviewed-by: Andi Kleen Link: http://lkml.kernel.org/r/4ED4C7EE0200007800064028@nat28.tlf.novell.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/entry_64.S | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index faf8d5e74b0b..ab4b7ffd526d 100644 --- 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) -- 2.39.5