1 files changed, 22 insertions, 47 deletions

diff --git a/tools/lib/api/fs/debugfs.c b/tools/lib/api/fs/debugfs.c
index d2b18e887071..8305b3e9d48e 100644
--- a/tools/lib/api/fs/debugfs.c
+++ b/tools/lib/api/fs/debugfs.c
@@ -3,75 +3,50 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 #include <stdbool.h>
 #include <sys/vfs.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <sys/mount.h>
 #include <linux/kernel.h>
 
 #include "debugfs.h"
 
-char debugfs_mountpoint[PATH_MAX + 1] = "/sys/kernel/debug";
+#ifndef DEBUGFS_DEFAULT_PATH
+#define DEBUGFS_DEFAULT_PATH            "/sys/kernel/debug"
+#endif
+
+char debugfs_mountpoint[PATH_MAX + 1] = DEBUGFS_DEFAULT_PATH;
 
 static const char * const debugfs_known_mountpoints[] = {
-        "/sys/kernel/debug",
+        DEBUGFS_DEFAULT_PATH,
         "/debug",
         0,
 };
 
 static bool debugfs_found;
 
+bool debugfs_configured(void)
+{
+        return debugfs_find_mountpoint() != NULL;
+}
+
 /* find the path to the mounted debugfs */
 const char *debugfs_find_mountpoint(void)
 {
-        const char * const *ptr;
-        char type[100];
-        FILE *fp;
+        const char *ret;
 
         if (debugfs_found)
                 return (const char *)debugfs_mountpoint;
 
-        ptr = debugfs_known_mountpoints;
-        while (*ptr) {
-                if (debugfs_valid_mountpoint(*ptr) == 0) {
-                        debugfs_found = true;
-                        strcpy(debugfs_mountpoint, *ptr);
-                        return debugfs_mountpoint;
-                }
-                ptr++;
-        }
-
-        /* give up and parse /proc/mounts */
-        fp = fopen("/proc/mounts", "r");
-        if (fp == NULL)
-                return NULL;
-
-        while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
-                      debugfs_mountpoint, type) == 2) {
-                if (strcmp(type, "debugfs") == 0)
-                        break;
-        }
-        fclose(fp);
+        ret = find_mountpoint("debugfs", (long) DEBUGFS_MAGIC,
+                              debugfs_mountpoint, PATH_MAX + 1,
+                              debugfs_known_mountpoints);
+        if (ret)
+                debugfs_found = true;
 
-        if (strcmp(type, "debugfs") != 0)
-                return NULL;
-
-        debugfs_found = true;
-
-        return debugfs_mountpoint;
-}
-
-/* verify that a mountpoint is actually a debugfs instance */
-
-int debugfs_valid_mountpoint(const char *debugfs)
-{
-        struct statfs st_fs;
-
-        if (statfs(debugfs, &st_fs) < 0)
-                return -ENOENT;
-        else if ((long)st_fs.f_type != (long)DEBUGFS_MAGIC)
-                return -ENOENT;
-
-        return 0;
+        return ret;
 }
 
 /* mount the debugfs somewhere if it's not mounted */
@@ -87,7 +62,7 @@ char *debugfs_mount(const char *mountpoint)
                 mountpoint = getenv(PERF_DEBUGFS_ENVIRONMENT);
                 /* if no environment variable, use default */
                 if (mountpoint == NULL)
-                        mountpoint = "/sys/kernel/debug";
+                        mountpoint = DEBUGFS_DEFAULT_PATH;
         }
 
         if (mount(NULL, mountpoint, "debugfs", 0, NULL) < 0)