FROMLIST: drivers: char: random: add get_random_long()

[firefly-linux-kernel-4.4.55.git] / drivers / char / random.c

diff --git a/drivers/char/random.c b/drivers/char/random.c
index d0da5d852d41e5588bb9bd192431a403a9696848..b583e53366306db870a0d61918156f41985f075e 100644 (file)
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1818,6 +1818,28 @@ unsigned int get_random_int(void)
 }
 EXPORT_SYMBOL(get_random_int);
 
+/*
+ * Same as get_random_int(), but returns unsigned long.
+ */
+unsigned long get_random_long(void)
+{
+       __u32 *hash;
+       unsigned long ret;
+
+       if (arch_get_random_long(&ret))
+               return ret;
+
+       hash = get_cpu_var(get_random_int_hash);
+
+       hash[0] += current->pid + jiffies + random_get_entropy();
+       md5_transform(hash, random_int_secret);
+       ret = *(unsigned long *)hash;
+       put_cpu_var(get_random_int_hash);
+
+       return ret;
+}
+EXPORT_SYMBOL(get_random_long);
+
 /*
  * randomize_range() returns a start address such that
  *