perf util: Move do_read from session to util

Not really something to be exported from session.c. Rename it to
'readn' as others did in the past.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 2 insertions, 20 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 0f7e544544f5..b163dfd6cbc5 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -838,23 +838,6 @@ static struct thread *perf_session__register_idle_thread(struct perf_session *se
         return thread;
 }
 
-int do_read(int fd, void *buf, size_t size)
-{
-        void *buf_start = buf;
-
-        while (size) {
-                int ret = read(fd, buf, size);
-
-                if (ret <= 0)
-                        return ret;
-
-                size -= ret;
-                buf += ret;
-        }
-
-        return buf - buf_start;
-}
-
 #define session_done()  (*(volatile int *)(&session_done))
 volatile int session_done;
 
@@ -872,7 +855,7 @@ static int __perf_session__process_pipe_events(struct perf_session *self,
 
         head = 0;
 more:
-        err = do_read(self->fd, &event, sizeof(struct perf_event_header));
+        err = readn(self->fd, &event, sizeof(struct perf_event_header));
         if (err <= 0) {
                 if (err == 0)
                         goto done;
@@ -892,8 +875,7 @@ more:
         p += sizeof(struct perf_event_header);
 
         if (size - sizeof(struct perf_event_header)) {
-                err = do_read(self->fd, p,
-                              size - sizeof(struct perf_event_header));
+                err = readn(self->fd, p, size - sizeof(struct perf_event_header));
                 if (err <= 0) {
                         if (err == 0) {
                                 pr_err("unexpected end of event stream\n");