perf core: Add perf_callchain_store_context() helper

We need have different helpers to account how many contexts we have in
the sample and for real addresses, so do it now as a prep patch, to
ease review.

Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

include/linux/perf_event.h

@@ -1079,6 +1079,8 @@ extern void put_callchain_buffers(void);
 
 extern int sysctl_perf_event_max_stack;
 
+#define perf_callchain_store_context(ctx, context) perf_callchain_store(ctx, context)
+
 static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip)
 {
 	if (ctx->nr < ctx->max_stack) {