Messages in this thread Patch in this message | | | From | Daniel Bristot de Oliveira <> | Subject | [RFC PATCH 5/7] trace: Use early task context tracking if available | Date | Tue, 2 Apr 2019 22:03:57 +0200 |
| |
Use the early task context tracking to detect the current context, if the arch supports it.
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Joel Fernandes (Google)" <joel@joelfernandes.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Tommaso Cucinotta <tommaso.cucinotta@santannapisa.it> Cc: Romulo Silva de Oliveira <romulo.deoliveira@ufsc.br> Cc: Clark Williams <williams@redhat.com> Cc: linux-kernel@vger.kernel.org Cc: x86@kernel.org --- kernel/trace/trace.h | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 09318748fab8..62ba4bd0e436 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -632,7 +632,18 @@ enum { TRACE_CTX_NORMAL, TRACE_CTX_MAX }; +#ifdef ARCH_HAS_TASK_CONTEXT +static __always_inline int trace_get_context_bit(void) +{ + unsigned long tc = this_cpu_read(task_context); + if (tc) + return tc & TASK_CTX_NMI ? TRACE_CTX_NMI : + tc & TASK_CTX_IRQ ? TRACE_CTX_IRQ : TRACE_CTX_SOFTIRQ; + else + return TRACE_CTX_NORMAL; +} +#else /* ARCH_HAS_TASK_CONTEXT */ static __always_inline int trace_get_context_bit(void) { unsigned long pc = preempt_count(); @@ -643,6 +654,7 @@ static __always_inline int trace_get_context_bit(void) else return TRACE_CTX_NORMAL; } +#endif /* ARCH_HAS_TASK_CONTEXT */ static __always_inline int trace_test_and_set_recursion(int start, int max) { -- 2.20.1
| |