linux-kernel - [tip:x86/asm] perf/x86: Convert perf_callchain

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Date:   Tue, 20 Sep 2016 07:59:37 -0700
From:   tip-bot for Josh Poimboeuf <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     luto@...nel.org, peterz@...radead.org, brgerst@...il.com,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        dvlasenk@...hat.com, jpoimboe@...hat.com, mingo@...nel.org,
        nilayvaish@...il.com, fweisbec@...il.com, rostedt@...dmis.org,
        tglx@...utronix.de, keescook@...omium.org, bp@...en8.de,
        hpa@...or.com, luto@...capital.net, byungchul.park@....com
Subject: [tip:x86/asm] perf/x86: Convert perf_callchain_kernel() to use the
 new unwinder

Commit-ID:  35f4d9b32527c08c3da3982aedae5198dc663ce8
Gitweb:     http://git.kernel.org/tip/35f4d9b32527c08c3da3982aedae5198dc663ce8
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Fri, 16 Sep 2016 14:18:13 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 20 Sep 2016 08:29:33 +0200

perf/x86: Convert perf_callchain_kernel() to use the new unwinder

Convert perf_callchain_kernel() to use the new unwinder.  dump_trace()
has been deprecated.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Byungchul Park <byungchul.park@....com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Nilay Vaish <nilayvaish@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/a2df0c4f09b3d438e11b41681f10b0775a819a7f.1474045023.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/core.c | 33 ++++++++++-----------------------
 1 file changed, 10 insertions(+), 23 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 477dc38..0a8bd7f 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -37,6 +37,7 @@
 #include <asm/timer.h>
 #include <asm/desc.h>
 #include <asm/ldt.h>
+#include <asm/unwind.h>
 
 #include "perf_event.h"
 
@@ -2247,31 +2248,12 @@ void arch_perf_update_userpage(struct perf_event *event,
 	cyc2ns_read_end(data);
 }
 
-/*
- * callchain support
- */
-
-static int backtrace_stack(void *data, const char *name)
-{
-	return 0;
-}
-
-static int backtrace_address(void *data, unsigned long addr, int reliable)
-{
-	struct perf_callchain_entry_ctx *entry = data;
-
-	return perf_callchain_store(entry, addr);
-}
-
-static const struct stacktrace_ops backtrace_ops = {
-	.stack			= backtrace_stack,
-	.address		= backtrace_address,
-	.walk_stack		= print_context_stack_bp,
-};
-
 void
 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
 {
+	struct unwind_state state;
+	unsigned long addr;
+
 	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
 		/* TODO: We don't support guest os callchain now */
 		return;
@@ -2280,7 +2262,12 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re
 	if (perf_callchain_store(entry, regs->ip))
 		return;
 
-	dump_trace(NULL, regs, NULL, 0, &backtrace_ops, entry);
+	for (unwind_start(&state, current, regs, NULL); !unwind_done(&state);
+	     unwind_next_frame(&state)) {
+		addr = unwind_get_return_address(&state);
+		if (!addr || perf_callchain_store(entry, addr))
+			return;
+	}
 }
 
 static inline int