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oprofile/x86: Convert x86_backtrace() to use the new unwinder

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Convert oprofile's x86_backtrace() to use the new unwinder.
dump_trace() has been deprecated.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <rric@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/412df8927705795e8ea60cffcf89a79e010713b1.1474045023.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Josh Poimboeuf 2016-09-16 14:18:15 -05:00 committed by Ingo Molnar
parent 49a612c6b0
commit ec2ad9ccf1
1 changed files with 17 additions and 22 deletions
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39
arch/x86/oprofile/backtrace.c
View File

@ -16,27 +16,7 @@
#include <asm/ptrace.h>
#include <asm/stacktrace.h>
static int backtrace_stack(void *data, const char *name)
{
/* Yes, we want all stacks */
return 0;
}
static int backtrace_address(void *data, unsigned long addr, int reliable)
{
unsigned int *depth = data;
if ((*depth)--)
oprofile_add_trace(addr);
return 0;
}
static struct stacktrace_ops backtrace_ops = {
.stack = backtrace_stack,
.address = backtrace_address,
.walk_stack = print_context_stack,
};
#include <asm/unwind.h>
#ifdef CONFIG_COMPAT
static struct stack_frame_ia32 *
@ -113,14 +93,29 @@ x86_backtrace(struct pt_regs * const regs, unsigned int depth)
struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
if (!user_mode(regs)) {
struct unwind_state state;
unsigned long addr;
if (!depth)
return;
oprofile_add_trace(regs->ip);
if (!--depth)
return;
dump_trace(NULL, regs, NULL, 0, &backtrace_ops, &depth);
for (unwind_start(&state, current, regs, NULL);
!unwind_done(&state); unwind_next_frame(&state)) {
addr = unwind_get_return_address(&state);
if (!addr)
break;
oprofile_add_trace(addr);
if (!--depth)
break;
}
return;
}