Re: perf-core build fails on powerpc

[John Garry]

On 13/03/2018 20:10, Sukadev Bhattiprolu wrote:

+
John Garry [john.ga...@huawei.com] wrote:
On 13/03/2018 19:17, Sukadev Bhattiprolu wrote:


Building perf on Powerpc seems broken when using Arnaldo's perf/core branch
with HEAD as:

    1b442ed ("perf test: Fix exit code for record+probe_libc_inet_pton.sh")

It maybe related to this commit:

        commit d596299
        Author: John Garry <john.ga...@huawei.com>
        Date:   Thu Mar 8 18:58:29 2018 +0800

            perf vendor events: Add support for pmu events vendor subdirectory

Reverting this hunk from tools/perf/pmu-events/jevents.c, seems to fix the
problem for me.


Hi John,

I have an xfs file system which seems to have d_type == DT_UNKNOWN for all
entries in 'tools/perf/pmu-events/arch/power8'! readdir(3) says ->d_type
may not be supported by all file systems.

Not relying on ->d_type seems to fix it:


Hi Sukadev,

Thanks for debugging this. Jiri Olsa (cc'ed) warned me on this, so I did 
add the check for d_type == DT_UNKNOWN.

But, if all files have d_type == DT_UNKNOWN, you're code would from 
visual observation look to be same as mine (apart from check for '.' or 
'..' filename, which I would say is already covered by stat() and 
S_ISDIR()). Or is d_type value just unreliable?

Much appreciated,
John

@@ -873,26 +879,26 @@ static int is_leaf_dir(const char *fpath)
                return 0;

        while ((dir = readdir(d)) != NULL) {
-               if (dir->d_type == DT_DIR && dir->d_name[0] != '.') {
-                       res = 0;
-                       break;
-               } else if (dir->d_type == DT_UNKNOWN) {
-                       char path[PATH_MAX];
-                       struct stat st;
+               char path[PATH_MAX];
+               struct stat st;

-                       sprintf(path, "%s/%s", fpath, dir->d_name);
-                       if (stat(path, &st))
-                               break;
+               if (strcmp(dir->d_name, ".") == 0 ||
+                               strcmp(dir->d_name, "..") == 0)
+                       continue;

-                       if (S_ISDIR(st.st_mode)) {
-                               res = 0;
-                               break;
-                       }
+               sprintf(path, "%s/%s", fpath, dir->d_name);
+               if (stat(path, &st))
+                       break;
+
+               if (S_ISDIR(st.st_mode)) {
+                       res = 0;
+                       break;