[PATCH 3/4] perf kvm: limit repetitive guestmount message to once

[David Ahern <dsahern@gmail.com>]

After 7ed97ad use of the guestmount option without a subdir for each
VM generates an error message for *each* sample related to that VM. Once
is enough.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 tools/perf/util/map.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 8668569..641377e 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -8,6 +8,7 @@
 #include <unistd.h>
 #include "map.h"
 #include "thread.h"
+#include "asm/bug.h"
 
 const char *map_type__name[MAP__NR_TYPES] = {
 	[MAP__FUNCTION] = "Functions",
@@ -695,7 +696,7 @@ struct machine *machines__findnew(struct rb_root *self, pid_t pid)
 	    (symbol_conf.guestmount)) {
 		sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
 		if (access(path, R_OK)) {
-			pr_err("Can't access file %s\n", path);
+			WARN_ONCE(1, "Can't access file %s\n", path);
 			machine = NULL;
 			goto out;
 		}
-- 
1.7.10.1