From: Arnd Bergmann <arnd@arndb.de>
Date: Sun, 27 Sep 2015 20:45:14 +0000 (-0400)
Subject: staging/lustre: use 64-bit times for cfs_srand seed
X-Git-Tag: v4.9.8~3287^2~1493
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1f4fc343c008981d3a91351c030e2c29f5cd1b1c;p=platform%2Fkernel%2Flinux-rpi3.git

staging/lustre: use 64-bit times for cfs_srand seed

Several functions in Lustre call cfs_srand with do_gettimeofday
as the seed to get a pseudo-random number.
There is no bug here, but changing it to use ktime_get_ts64()
gets us closer to deprecating do_gettimeofday() and makes it slightly
more random.

Affected functions are:
lnet_shuffle_seed, init_lustre_lite and class_handle_init

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/lustre/lnet/lnet/router.c b/drivers/staging/lustre/lnet/lnet/router.c
index 75ff382..2cdda3f 100644
--- a/drivers/staging/lustre/lnet/lnet/router.c
+++ b/drivers/staging/lustre/lnet/lnet/router.c
@@ -237,7 +237,7 @@ static void lnet_shuffle_seed(void)
 {
 	static int seeded;
 	int lnd_type, seed[2];
-	struct timeval tv;
+	struct timespec64 ts;
 	lnet_ni_t *ni;
 	struct list_head *tmp;
 
@@ -256,8 +256,8 @@ static void lnet_shuffle_seed(void)
 			seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
 	}
 
-	do_gettimeofday(&tv);
-	cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
+	ktime_get_ts64(&ts);
+	cfs_srand(ts.tv_sec ^ seed[0], ts.tv_nsec ^ seed[1]);
 	seeded = 1;
 }
 
diff --git a/drivers/staging/lustre/lustre/llite/super25.c b/drivers/staging/lustre/lustre/llite/super25.c
index 4cf7af2..a0de99f 100644
--- a/drivers/staging/lustre/lustre/llite/super25.c
+++ b/drivers/staging/lustre/lustre/llite/super25.c
@@ -90,7 +90,7 @@ void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
 static int __init init_lustre_lite(void)
 {
 	lnet_process_id_t lnet_id;
-	struct timeval tv;
+	struct timespec64 ts;
 	int i, rc, seed[2];
 
 	CLASSERT(sizeof(LUSTRE_VOLATILE_HDR) == LUSTRE_VOLATILE_HDR_LEN + 1);
@@ -152,8 +152,8 @@ static int __init init_lustre_lite(void)
 			seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 	}
 
-	do_gettimeofday(&tv);
-	cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
+	ktime_get_ts64(&ts);
+	cfs_srand(ts.tv_sec ^ seed[0], ts.tv_nsec ^ seed[1]);
 	setup_timer(&ll_capa_timer, ll_capa_timer_callback, 0);
 	rc = ll_capa_thread_start();
 	if (rc != 0)
diff --git a/drivers/staging/lustre/lustre/obdclass/lustre_handles.c b/drivers/staging/lustre/lustre/obdclass/lustre_handles.c
index 35a94a8..97d79da 100644
--- a/drivers/staging/lustre/lustre/obdclass/lustre_handles.c
+++ b/drivers/staging/lustre/lustre/obdclass/lustre_handles.c
@@ -193,7 +193,7 @@ EXPORT_SYMBOL(class_handle_free_cb);
 int class_handle_init(void)
 {
 	struct handle_bucket *bucket;
-	struct timeval tv;
+	struct timespec64 ts;
 	int seed[2];
 
 	LASSERT(handle_hash == NULL);
@@ -212,8 +212,8 @@ int class_handle_init(void)
 
 	/** bug 21430: add randomness to the initial base */
 	cfs_get_random_bytes(seed, sizeof(seed));
-	do_gettimeofday(&tv);
-	cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
+	ktime_get_ts64(&ts);
+	cfs_srand(ts.tv_sec ^ seed[0], ts.tv_nsec ^ seed[1]);
 
 	cfs_get_random_bytes(&handle_base, sizeof(handle_base));
 	LASSERT(handle_base != 0ULL);