linux-kernel - [PATCH] md: Use time_in

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Date:	Thu, 22 May 2014 22:42:37 +0200
From:	Manuel Schölling <manuel.schoelling@....de>
To:	agk@...hat.com
Cc:	snitzer@...hat.com, dm-devel@...hat.com, neilb@...e.de,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Manuel Schölling <manuel.schoelling@....de>
Subject: [PATCH] md: Use time_in_range()

To be future-proof and for better readability the time comparisons are modified
to use time_in_range() instead of plain, error-prone math.

Signed-off-by: Manuel Schölling <manuel.schoelling@....de>
---
 drivers/md/dm-cache-target.c       |    5 +++--
 drivers/md/dm-log-userspace-base.c |    4 ++--
 drivers/md/dm-thin.c               |    5 +++--
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 9380be7..4378d1d 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1429,8 +1429,9 @@ static void process_bio(struct cache *cache, struct prealloc *structs,
 
 static int need_commit_due_to_time(struct cache *cache)
 {
-	return jiffies < cache->last_commit_jiffies ||
-	       jiffies > cache->last_commit_jiffies + COMMIT_PERIOD;
+	return !time_in_range(jiffies,
+	      cache->last_commit_jiffies,
+	      cache->last_commit_jiffies + COMMIT_PERIOD);
 }
 
 static int commit_if_needed(struct cache *cache)
diff --git a/drivers/md/dm-log-userspace-base.c b/drivers/md/dm-log-userspace-base.c
index b953db6..cd9b171 100644
--- a/drivers/md/dm-log-userspace-base.c
+++ b/drivers/md/dm-log-userspace-base.c
@@ -829,7 +829,7 @@ static int userspace_is_remote_recovering(struct dm_dirty_log *log,
 	int r;
 	uint64_t region64 = region;
 	struct log_c *lc = log->context;
-	static unsigned long long limit;
+	static unsigned long limit;
 	struct {
 		int64_t is_recovering;
 		uint64_t in_sync_hint;
@@ -845,7 +845,7 @@ static int userspace_is_remote_recovering(struct dm_dirty_log *log,
 	 */
 	if (region < lc->in_sync_hint)
 		return 0;
-	else if (jiffies < limit)
+	else if (time_after(limit, jiffies))
 		return 1;
 
 	limit = jiffies + (HZ / 4);
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 2e71de8..c83b363 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1375,8 +1375,9 @@ static void process_bio_fail(struct thin_c *tc, struct bio *bio)
  */
 static int need_commit_due_to_time(struct pool *pool)
 {
-	return jiffies < pool->last_commit_jiffies ||
-	       jiffies > pool->last_commit_jiffies + COMMIT_PERIOD;
+	return !time_in_range(jiffies,
+	      pool->last_commit_jiffies,
+	      pool->last_commit_jiffies + COMMIT_PERIOD);
 }
 
 #define thin_pbd(node) rb_entry((node), struct dm_thin_endio_hook, rb_node)
-- 
1.7.10.4

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