[XFS] reducing the number of random number functions.

Patch provided by Joe Perches

SGI-PV: 961696
SGI-Modid: xfs-linux-melb:xfs-kern:28209a
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

fs/xfs/support/debug.c

@@ -81,20 +81,3 @@ assfail(char *expr, char *file, int line)
 	printk("Assertion failed: %s, file: %s, line: %d\n", expr, file, line);
 	BUG();
 }
-
-#if ((defined(DEBUG) || defined(INDUCE_IO_ERRROR)) && !defined(NO_WANT_RANDOM))
-unsigned long random(void)
-{
-	static unsigned long	RandomValue = 1;
-	/* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */
-	register long	rv = RandomValue;
-	register long	lo;
-	register long	hi;
-
-	hi = rv / 127773;
-	lo = rv % 127773;
-	rv = 16807 * lo - 2836 * hi;
-	if (rv <= 0) rv += 2147483647;
-	return RandomValue = rv;
-}
-#endif /* DEBUG || INDUCE_IO_ERRROR || !NO_WANT_RANDOM */

fs/xfs/support/debug.h

@@ -50,7 +50,7 @@ extern void assfail(char *expr, char *f, int l);
 #else /* DEBUG */
 
 # define ASSERT(expr)	ASSERT_ALWAYS(expr)
-extern unsigned long random(void);
+# include <linux/random.h>
 
 #ifndef STATIC
 # define STATIC noinline

fs/xfs/xfs_alloc.c

@@ -764,7 +764,7 @@ xfs_alloc_ag_vextent_near(
 	 */
 	int		dofirst;	/* set to do first algorithm */
 
-	dofirst = random() & 1;
+	dofirst = random32() & 1;
 #endif
 	/*
 	 * Get a cursor for the by-size btree.

fs/xfs/xfs_error.c

@@ -80,7 +80,7 @@ xfs_error_test(int error_tag, int *fsidp, char *expression,
 	int i;
 	int64_t fsid;
 
-	if (random() % randfactor)
+	if (random32() % randfactor)
 		return 0;
 
 	memcpy(&fsid, fsidp, sizeof(xfs_fsid_t));