Commit 35f4d9b3 authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Ingo Molnar

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: default avatarJosh 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: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/a2df0c4f09b3d438e11b41681f10b0775a819a7f.1474045023.git.jpoimboe@redhat.comSigned-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
parent 7c7900f8
......@@ -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
......
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