linux-kernel - [PATCH v2 16/44] oprofile/x86: add regs->ip to oprofile trace

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Message-Id: <c31bbbfd58d1e1021457f257e064f0775659e5e2.1470345772.git.jpoimboe@redhat.com>
Date:	Thu,  4 Aug 2016 17:22:12 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Brian Gerst <brgerst@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Byungchul Park <byungchul.park@....com>,
	Robert Richter <rric@...nel.org>
Subject: [PATCH v2 16/44] oprofile/x86: add regs->ip to oprofile trace

dump_trace() doesn't add the interrupted instruction's address to the
trace, so add it manually.

Cc: Robert Richter <rric@...nel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 arch/x86/oprofile/backtrace.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/oprofile/backtrace.c b/arch/x86/oprofile/backtrace.c
index c594768..d950f9e 100644
--- a/arch/x86/oprofile/backtrace.c
+++ b/arch/x86/oprofile/backtrace.c
@@ -113,8 +113,14 @@ x86_backtrace(struct pt_regs * const regs, unsigned int depth)
 	struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
 
 	if (!user_mode(regs)) {
-		if (depth)
-			dump_trace(NULL, regs, NULL, 0, &backtrace_ops, &depth);
+		if (!depth)
+			return;
+
+		oprofile_add_trace(regs->ip);
+		if (!--depth)
+			return;
+
+		dump_trace(NULL, regs, NULL, 0, &backtrace_ops, &depth);
 		return;
 	}
 
-- 
2.7.4