Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

 * Fix include order for bison/flex-generated C files, from Ben Hutchings

 * Build fixes and documentation corrections from David Ahern

 * Group parsing support, from Jiri Olsa

 * UI/gtk refactorings and improvements from Namhyung Kim

 * NULL deref fix for perf script, from Namhyung Kim

 * Assorted cleanups from Robert Richter

 * Let O= makes handle relative paths, from Steven Rostedt

 * perf script python fixes, from Feng Tang.

 * Improve 'perf lock' error message when the needed tracepoints
   are not present, from David Ahern.

 * Initial bash completion support, from Frederic Weisbecker

 * Allow building without libelf, from Namhyung Kim.

 * Support DWARF CFI based unwind to have callchains when %bp
   based unwinding is not possible, from Jiri Olsa.

 * Symbol resolution fixes, while fixing support PPC64 files with an .opt ELF
   section was the end goal, several fixes for code that handles all
   architectures and cleanups are included, from Cody Schafer.

 * Add a description for the JIT interface, from Andi Kleen.

 * Assorted fixes for Documentation and build in 32 bit, from Robert Richter

 * Add support for non-tracepoint events in perf script python, from Feng Tang

 * Cache the libtraceevent event_format associated to each evsel early, so that we
   avoid relookups, i.e. calling pevent_find_event repeatedly when processing
   tracepoint events.

   [ This is to reduce the surface contact with libtraceevents and make clear what
     is that the perf tools needs from that lib: so far parsing the common and per
     event fields. ]

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 27 insertions, 9 deletions

diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index fdff65dff1bb..483162a9f908 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -13,6 +13,7 @@
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
+#include <linux/pstore.h>
 #include <linux/fs.h>
 
 #include "trace.h"
@@ -75,6 +76,14 @@ function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip,
         preempt_enable_notrace();
 }
 
+/* Our two options */
+enum {
+        TRACE_FUNC_OPT_STACK    = 0x1,
+        TRACE_FUNC_OPT_PSTORE   = 0x2,
+};
+
+static struct tracer_flags func_flags;
+
 static void
 function_trace_call(unsigned long ip, unsigned long parent_ip,
                     struct ftrace_ops *op, struct pt_regs *pt_regs)
@@ -100,6 +109,12 @@ function_trace_call(unsigned long ip, unsigned long parent_ip,
         disabled = atomic_inc_return(&data->disabled);
 
         if (likely(disabled == 1)) {
+                /*
+                 * So far tracing doesn't support multiple buffers, so
+                 * we make an explicit call for now.
+                 */
+                if (unlikely(func_flags.val & TRACE_FUNC_OPT_PSTORE))
+                        pstore_ftrace_call(ip, parent_ip);
                 pc = preempt_count();
                 trace_function(tr, ip, parent_ip, flags, pc);
         }
@@ -162,15 +177,13 @@ static struct ftrace_ops trace_stack_ops __read_mostly =
         .flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE,
 };
 
-/* Our two options */
-enum {
-        TRACE_FUNC_OPT_STACK = 0x1,
-};
-
 static struct tracer_opt func_opts[] = {
 #ifdef CONFIG_STACKTRACE
         { TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) },
 #endif
+#ifdef CONFIG_PSTORE_FTRACE
+        { TRACER_OPT(func_pstore, TRACE_FUNC_OPT_PSTORE) },
+#endif
         { } /* Always set a last empty entry */
 };
 
@@ -208,10 +221,11 @@ static void tracing_stop_function_trace(void)
 
 static int func_set_flag(u32 old_flags, u32 bit, int set)
 {
-        if (bit == TRACE_FUNC_OPT_STACK) {
+        switch (bit) {
+        case TRACE_FUNC_OPT_STACK:
                 /* do nothing if already set */
                 if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK))
-                        return 0;
+                        break;
 
                 if (set) {
                         unregister_ftrace_function(&trace_ops);
@@ -221,10 +235,14 @@ static int func_set_flag(u32 old_flags, u32 bit, int set)
                         register_ftrace_function(&trace_ops);
                 }
 
-                return 0;
+                break;
+        case TRACE_FUNC_OPT_PSTORE:
+                break;
+        default:
+                return -EINVAL;
         }
 
-        return -EINVAL;
+        return 0;
 }
 
 static struct tracer function_trace __read_mostly =