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| author | Thomas Gleixner <tglx@linutronix.de> | 2017-08-28 08:47:21 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-08-29 11:42:23 +0200 |
| commit | 2feb1b316d48004d905278c02a55902cab0be8be (patch) | |
| tree | e34696f4142dfd9366473a96612398da48bce30d /arch/x86/include/asm/trace | |
| parent | f7eaf6e00fd581043bb540dfe865f1d81769b189 (diff) | |
| download | blackbird-obmc-linux-2feb1b316d48004d905278c02a55902cab0be8be.tar.gz blackbird-obmc-linux-2feb1b316d48004d905278c02a55902cab0be8be.zip | |
x86/tracing: Introduce a static key for exception tracing
Switching the IDT just for avoiding tracepoints creates a completely
impenetrable macro/inline/ifdef mess.
There is no point in avoiding tracepoints for most of the traps/exceptions.
For the more expensive tracepoints, like pagefaults, this can be handled with
an explicit static key.
Preparatory patch to remove the tracing IDT.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170828064956.593094539@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/trace')
| -rw-r--r-- | arch/x86/include/asm/trace/common.h | 15 | ||||
| -rw-r--r-- | arch/x86/include/asm/trace/exceptions.h | 4 | ||||
| -rw-r--r-- | arch/x86/include/asm/trace/irq_vectors.h | 4 |
3 files changed, 17 insertions, 6 deletions
diff --git a/arch/x86/include/asm/trace/common.h b/arch/x86/include/asm/trace/common.h new file mode 100644 index 000000000000..b1eb7b18ee8a --- /dev/null +++ b/arch/x86/include/asm/trace/common.h @@ -0,0 +1,15 @@ +#ifndef _ASM_TRACE_COMMON_H +#define _ASM_TRACE_COMMON_H + +extern int trace_irq_vector_regfunc(void); +extern void trace_irq_vector_unregfunc(void); + +#ifdef CONFIG_TRACING +DECLARE_STATIC_KEY_FALSE(trace_irqvectors_key); +#define trace_irqvectors_enabled() \ + static_branch_unlikely(&trace_irqvectors_key) +#else +static inline bool trace_irqvectors_enabled(void) { return false; } +#endif + +#endif diff --git a/arch/x86/include/asm/trace/exceptions.h b/arch/x86/include/asm/trace/exceptions.h index 2422b14c50a7..960a5b50ac3b 100644 --- a/arch/x86/include/asm/trace/exceptions.h +++ b/arch/x86/include/asm/trace/exceptions.h @@ -5,9 +5,7 @@ #define _TRACE_PAGE_FAULT_H #include <linux/tracepoint.h> - -extern int trace_irq_vector_regfunc(void); -extern void trace_irq_vector_unregfunc(void); +#include <asm/trace/common.h> DECLARE_EVENT_CLASS(x86_exceptions, diff --git a/arch/x86/include/asm/trace/irq_vectors.h b/arch/x86/include/asm/trace/irq_vectors.h index 32dd6a9e343c..7825b4426e7e 100644 --- a/arch/x86/include/asm/trace/irq_vectors.h +++ b/arch/x86/include/asm/trace/irq_vectors.h @@ -5,9 +5,7 @@ #define _TRACE_IRQ_VECTORS_H #include <linux/tracepoint.h> - -extern int trace_irq_vector_regfunc(void); -extern void trace_irq_vector_unregfunc(void); +#include <asm/trace/common.h> DECLARE_EVENT_CLASS(x86_irq_vector, |
