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Message-Id: <4ED4C7EE0200007800064028@nat28.tlf.novell.com> Date: Tue, 29 Nov 2011 10:54:22 +0000 From: "Jan Beulich" <JBeulich@...e.com> To: <mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com> Cc: <linux-kernel@...r.kernel.org> 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 <jbeulich@...e.com> --- arch/x86/kernel/entry_64.S | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- 3.2-rc3/arch/x86/kernel/entry_64.S +++ 3.2-rc3-x86_64-entry-iret-from-syscall/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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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