linux-kernel - [PATCH 0/3] tracing/perf: perf_trace_buf/perf

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Message-ID: <20130618192147.GA19443@redhat.com>
Date:	Tue, 18 Jun 2013 21:21:47 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] tracing/perf: perf_trace_buf/perf_xxx hacks.

Hello.

On top of "PATCH 0/3] tracing: more list_empty(perf_events) checks"
series I sent yesterday.

Compile tested only, not for inclusion yet.

But I'll appreciate if you can take a look. I'll try to test this
tomorrow somehow and let you know. Right now I am looking at asm code,
looks correct...

I also compiled the kernel with the additional patch below, everything
compiles except sched/core.o as expected.

Oleg.

--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -664,6 +664,8 @@ perf_trace_##call(void *__data, proto)					\
 									\
 	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 									\
+	BUILD_BUG_ON(!(__builtin_constant_p(!__task) && !__task));	\
+									\
 	head = this_cpu_ptr(event_call->perf_events);			\
 	if (__builtin_constant_p(!__task) && !__task &&			\
 				hlist_empty(head))			\

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