| From | Andy Lutomirski <> | Subject | [PATCH v2 33/36] x86/entry: Hide two syscall entry assertions behind CONFIG_DEBUG_ENTRY | Date | Mon, 5 Oct 2015 17:48:21 -0700 |
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This shaves a few cycles off the slow paths.
Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/entry/common.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 3ae6191ad1a2..88966fbf7125 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -71,7 +71,8 @@ unsigned long syscall_trace_enter_phase1(struct pt_regs *regs, u32 arch) unsigned long ret = 0; u32 work; - BUG_ON(regs != task_pt_regs(current)); + if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) + BUG_ON(regs != task_pt_regs(current)); work = ACCESS_ONCE(current_thread_info()->flags) & _TIF_WORK_SYSCALL_ENTRY; @@ -160,7 +161,8 @@ long syscall_trace_enter_phase2(struct pt_regs *regs, u32 arch, u32 work = ACCESS_ONCE(current_thread_info()->flags) & _TIF_WORK_SYSCALL_ENTRY; - BUG_ON(regs != task_pt_regs(current)); + if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) + BUG_ON(regs != task_pt_regs(current)); /* * If we stepped into a sysenter/syscall insn, it trapped in -- 2.4.3
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