Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

[platform/adaptation/renesas_rcar/renesas_kernel.git] / tools / vm / page-types.c

diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index b76edf2..71c9c25 100644 (file)
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -36,7 +36,7 @@
 #include <sys/statfs.h>
 #include "../../include/uapi/linux/magic.h"
 #include "../../include/uapi/linux/kernel-page-flags.h"
-
+#include <lk/debugfs.h>
 
 #ifndef MAX_PATH
 # define MAX_PATH 256
@@ -178,7 +178,7 @@ static int          kpageflags_fd;
 static int             opt_hwpoison;
 static int             opt_unpoison;
 
-static char            hwpoison_debug_fs[MAX_PATH+1];
+static char            *hwpoison_debug_fs;
 static int             hwpoison_inject_fd;
 static int             hwpoison_forget_fd;
 
@@ -458,81 +458,6 @@ static uint64_t kpageflags_flags(uint64_t flags)
        return flags;
 }
 
-/* verify that a mountpoint is actually a debugfs instance */
-static int debugfs_valid_mountpoint(const char *debugfs)
-{
-       struct statfs st_fs;
-
-       if (statfs(debugfs, &st_fs) < 0)
-               return -ENOENT;
-       else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
-               return -ENOENT;
-
-       return 0;
-}
-
-/* find the path to the mounted debugfs */
-static const char *debugfs_find_mountpoint(void)
-{
-       const char *const *ptr;
-       char type[100];
-       FILE *fp;
-
-       ptr = debugfs_known_mountpoints;
-       while (*ptr) {
-               if (debugfs_valid_mountpoint(*ptr) == 0) {
-                       strcpy(hwpoison_debug_fs, *ptr);
-                       return hwpoison_debug_fs;
-               }
-               ptr++;
-       }
-
-       /* give up and parse /proc/mounts */
-       fp = fopen("/proc/mounts", "r");
-       if (fp == NULL)
-               perror("Can't open /proc/mounts for read");
-
-       while (fscanf(fp, "%*s %"
-                     STR(MAX_PATH)
-                     "s %99s %*s %*d %*d\n",
-                     hwpoison_debug_fs, type) == 2) {
-               if (strcmp(type, "debugfs") == 0)
-                       break;
-       }
-       fclose(fp);
-
-       if (strcmp(type, "debugfs") != 0)
-               return NULL;
-
-       return hwpoison_debug_fs;
-}
-
-/* mount the debugfs somewhere if it's not mounted */
-
-static void debugfs_mount(void)
-{
-       const char *const *ptr;
-
-       /* see if it's already mounted */
-       if (debugfs_find_mountpoint())
-               return;
-
-       ptr = debugfs_known_mountpoints;
-       while (*ptr) {
-               if (mount(NULL, *ptr, "debugfs", 0, NULL) == 0) {
-                       /* save the mountpoint */
-                       strcpy(hwpoison_debug_fs, *ptr);
-                       break;
-               }
-               ptr++;
-       }
-
-       if (*ptr == NULL) {
-               perror("mount debugfs");
-               exit(EXIT_FAILURE);
-       }
-}
-
 /*
  * page actions
  */
@@ -541,7 +466,11 @@ static void prepare_hwpoison_fd(void)
 {
        char buf[MAX_PATH + 1];
 
-       debugfs_mount();
+       hwpoison_debug_fs = debugfs_mount(NULL);
+       if (!hwpoison_debug_fs) {
+               perror("mount debugfs");
+               exit(EXIT_FAILURE);
+       }
 
        if (opt_hwpoison && !hwpoison_inject_fd) {
                snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",