Consolidate min_not_zero
We have several users of min_not_zero, each of them using their own
definition. Move the define to kernel.h.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>
diff --git a/block/blk-settings.c b/block/blk-settings.c
index a234f4b..8d592b5 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -455,11 +455,6 @@
}
EXPORT_SYMBOL(blk_queue_io_opt);
-/*
- * Returns the minimum that is _not_ zero, unless both are zero.
- */
-#define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
-
/**
* blk_queue_stack_limits - inherit underlying queue limits for stacked drivers
* @t: the stacking driver (top)
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 081522d..484ecbb 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -2972,7 +2972,6 @@
* we still need to figure out whether we accept that. */
mdev->p_size = p_size;
-#define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
if (get_ldev(mdev)) {
warn_if_differ_considerably(mdev, "lower level device sizes",
p_size, drbd_get_max_capacity(mdev->ldev));
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 5974d30..f30f6e8 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -706,8 +706,6 @@
return 0;
}
-#define min_not_zero(l, r) (((l) == 0) ? (r) : (((r) == 0) ? (l) : min(l, r)))
-
/*
* Return a minimum chunk size of all snapshots that have the specified origin.
* Return zero if the origin has no snapshots.
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index f9fc07d..90267f8 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -486,11 +486,6 @@
return 0;
}
-/*
- * Returns the minimum that is _not_ zero, unless both are zero.
- */
-#define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
-
int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 2b0a35e..f5df2f4 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -641,6 +641,16 @@
_max1 > _max2 ? _max1 : _max2; })
/**
+ * min_not_zero - return the minimum that is _not_ zero, unless both are zero
+ * @x: value1
+ * @y: value2
+ */
+#define min_not_zero(x, y) ({ \
+ typeof(x) __x = (x); \
+ typeof(y) __y = (y); \
+ __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
+
+/**
* clamp - return a value clamped to a given range with strict typechecking
* @val: current value
* @min: minimum allowable value