perf tools: Clean up O_LARGEFILE et al usage

Setting _FILE_OFFSET_BITS and using O_LARGEFILE, lseek64, etc,
is redundant. Thanks H. Peter Anvin for pointing it out.

So, this patch removes O_LARGEFILE, lseek64, etc.

Suggested-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4B6A8972.3070605@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 21 insertions, 23 deletions

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index d5facd5ab1f7..6c9aa16ee51f 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1,4 +1,3 @@
-#define _LARGEFILE64_SOURCE
 #define _FILE_OFFSET_BITS 64
 
 #include <sys/types.h>
@@ -388,7 +387,7 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
         sec_size = sizeof(*feat_sec) * nr_sections;
 
         sec_start = self->data_offset + self->data_size;
-        lseek64(fd, sec_start + sec_size, SEEK_SET);
+        lseek(fd, sec_start + sec_size, SEEK_SET);
 
         if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
                 struct perf_file_section *trace_sec;
@@ -396,9 +395,9 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
                 trace_sec = &feat_sec[idx++];
 
                 /* Write trace info */
-                trace_sec->offset = lseek64(fd, 0, SEEK_CUR);
+                trace_sec->offset = lseek(fd, 0, SEEK_CUR);
                 read_tracing_data(fd, attrs, nr_counters);
-                trace_sec->size = lseek64(fd, 0, SEEK_CUR) - trace_sec->offset;
+                trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
         }
 
 
@@ -408,18 +407,18 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
                 buildid_sec = &feat_sec[idx++];
 
                 /* Write build-ids */
-                buildid_sec->offset = lseek64(fd, 0, SEEK_CUR);
+                buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
                 err = dsos__write_buildid_table(fd);
                 if (err < 0) {
                         pr_debug("failed to write buildid table\n");
                         goto out_free;
                 }
-                buildid_sec->size = lseek64(fd, 0, SEEK_CUR) -
-                                            buildid_sec->offset;
+                buildid_sec->size = lseek(fd, 0, SEEK_CUR) -
+                                          buildid_sec->offset;
                 dsos__cache_build_ids();
         }
 
-        lseek64(fd, sec_start, SEEK_SET);
+        lseek(fd, sec_start, SEEK_SET);
         err = do_write(fd, feat_sec, sec_size);
         if (err < 0)
                 pr_debug("failed to write feature section\n");
@@ -513,7 +512,7 @@ int perf_header__write(struct perf_header *self, int fd, bool at_exit)
                 pr_debug("failed to write perf header\n");
                 return err;
         }
-        lseek64(fd, self->data_offset + self->data_size, SEEK_SET);
+        lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 
         self->frozen = 1;
         return 0;
@@ -567,7 +566,7 @@ int perf_header__process_sections(struct perf_header *self, int fd,
 
         sec_size = sizeof(*feat_sec) * nr_sections;
 
-        lseek64(fd, self->data_offset + self->data_size, SEEK_SET);
+        lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 
         if (perf_header__getbuffer64(self, fd, feat_sec, sec_size))
                 goto out_free;
@@ -641,7 +640,7 @@ static int perf_file_section__process(struct perf_file_section *self,
                                       struct perf_header *ph,
                                       int feat, int fd)
 {
-        if (lseek64(fd, self->offset, SEEK_SET) < 0) {
+        if (lseek(fd, self->offset, SEEK_SET) == (off_t)-1) {
                 pr_debug("Failed to lseek to %Ld offset for feature %d, "
                          "continuing...\n", self->offset, feat);
                 return 0;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 74cbc64a3a3c..0de7258e70a5 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1,4 +1,3 @@
-#define _LARGEFILE64_SOURCE
 #define _FILE_OFFSET_BITS 64
 
 #include <linux/kernel.h>
@@ -15,7 +14,7 @@ static int perf_session__open(struct perf_session *self, bool force)
 {
         struct stat input_stat;
 
-        self->fd = open(self->filename, O_RDONLY|O_LARGEFILE);
+        self->fd = open(self->filename, O_RDONLY);
         if (self->fd < 0) {
                 pr_err("failed to open file: %s", self->filename);
                 if (!strcmp(self->filename, "perf.data"))
diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index ca3c26d466f3..7cd1193918c7 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -18,7 +18,7 @@
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */
-#define _LARGEFILE64_SOURCE
+#define _FILE_OFFSET_BITS 64
 
 #include <dirent.h>
 #include <stdio.h>
@@ -83,7 +83,7 @@ static char *read_string(void)
         char *str = NULL;
         int size = 0;
         int i;
-        s64 r;
+        off_t r;
 
         for (;;) {
                 r = read(input_fd, buf, BUFSIZ);
@@ -117,8 +117,8 @@ static char *read_string(void)
         i++;
 
         /* move the file descriptor to the end of the string */
-        r = lseek64(input_fd, -(r - i), SEEK_CUR);
-        if (r < 0)
+        r = lseek(input_fd, -(r - i), SEEK_CUR);
+        if (r == (off_t)-1)
                 die("lseek");
 
         if (str) {
@@ -282,8 +282,8 @@ static void update_cpu_data_index(int cpu)
 
 static void get_next_page(int cpu)
 {
-        off64_t save_seek;
-        off64_t ret;
+        off_t save_seek;
+        off_t ret;
 
         if (!cpu_data[cpu].page)
                 return;
@@ -298,17 +298,17 @@ static void get_next_page(int cpu)
                 update_cpu_data_index(cpu);
 
                 /* other parts of the code may expect the pointer to not move */
-                save_seek = lseek64(input_fd, 0, SEEK_CUR);
+                save_seek = lseek(input_fd, 0, SEEK_CUR);
 
-                ret = lseek64(input_fd, cpu_data[cpu].offset, SEEK_SET);
-                if (ret < 0)
+                ret = lseek(input_fd, cpu_data[cpu].offset, SEEK_SET);
+                if (ret == (off_t)-1)
                         die("failed to lseek");
                 ret = read(input_fd, cpu_data[cpu].page, page_size);
                 if (ret < 0)
                         die("failed to read page");
 
                 /* reset the file pointer back */
-                lseek64(input_fd, save_seek, SEEK_SET);
+                lseek(input_fd, save_seek, SEEK_SET);
 
                 return;
         }