selftest: move seek_to_smaps_entry() out of mlock2-tests.c

Function seek_to_smaps_entry() can be useful for other selftest
functionalities, so move it out to header file.

Link: http://lkml.kernel.org/r/1473325970-11393-3-git-send-email-wei.guo.simon@gmail.comSigned-off-by: Simon Guo <wei.guo.simon@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Eric B Munson <emunson@akamai.com>
Cc: Simon Guo <wei.guo.simon@gmail.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Alexey Klimov <klimov.linux@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tools/testing/selftests/vm/mlock2-tests.c

 #define _GNU_SOURCE
 #include <sys/mman.h>
 #include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
 #include <sys/time.h>
@@ -119,46 +117,6 @@ static uint64_t get_kpageflags(unsigned long pfn)
 	return flags;
 }
 
-static FILE *seek_to_smaps_entry(unsigned long addr)
-{
-	FILE *file;
-	char *line = NULL;
-	size_t size = 0;
-	unsigned long start, end;
-	char perms[5];
-	unsigned long offset;
-	char dev[32];
-	unsigned long inode;
-	char path[BUFSIZ];
-
-	file = fopen("/proc/self/smaps", "r");
-	if (!file) {
-		perror("fopen smaps");
-		_exit(1);
-	}
-
-	while (getline(&line, &size, file) > 0) {
-		if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",
-			   &start, &end, perms, &offset, dev, &inode, path) < 6)
-			goto next;
-
-		if (start <= addr && addr < end)
-			goto out;
-
-next:
-		free(line);
-		line = NULL;
-		size = 0;
-	}
-
-	fclose(file);
-	file = NULL;
-
-out:
-	free(line);
-	return file;
-}
-
 #define VMFLAGS "VmFlags:"
 
 static bool is_vmflag_set(unsigned long addr, const char *vmflag)

tools/testing/selftests/vm/mlock2.h

 #include <syscall.h>
 #include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 #ifndef MLOCK_ONFAULT
 #define MLOCK_ONFAULT 1
@@ -18,3 +20,43 @@ static int mlock2_(void *start, size_t len, int flags)
 	return -1;
 #endif
 }
+
+static FILE *seek_to_smaps_entry(unsigned long addr)
+{
+	FILE *file;
+	char *line = NULL;
+	size_t size = 0;
+	unsigned long start, end;
+	char perms[5];
+	unsigned long offset;
+	char dev[32];
+	unsigned long inode;
+	char path[BUFSIZ];
+
+	file = fopen("/proc/self/smaps", "r");
+	if (!file) {
+		perror("fopen smaps");
+		_exit(1);
+	}
+
+	while (getline(&line, &size, file) > 0) {
+		if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",
+			   &start, &end, perms, &offset, dev, &inode, path) < 6)
+			goto next;
+
+		if (start <= addr && addr < end)
+			goto out;
+
+next:
+		free(line);
+		line = NULL;
+		size = 0;
+	}
+
+	fclose(file);
+	file = NULL;
+
+out:
+	free(line);
+	return file;
+}