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idr: document exit conditions on idr_for_each_entry better

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And some manual common subexpression elimination which may help the
compiler produce smaller code.

Signed-off-by: George Spelvin <linux@horizon.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
George Spelvin 2013-03-27 14:08:33 +01:00 committed by Jens Axboe
parent 29177b8966
commit b949be5857
1 changed files with 6 additions and 4 deletions
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10
include/linux/idr.h
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@ -122,11 +122,13 @@ static inline void *idr_find(struct idr *idr, int id)
* @idp: idr handle * @idp: idr handle
* @entry: the type * to use as cursor * @entry: the type * to use as cursor
* @id: id entry's key * @id: id entry's key
*
* @entry and @id do not need to be initialized before the loop, and
* after normal terminatinon @entry is left with the value NULL. This
* is convenient for a "not found" value.
*/ */
#define idr_for_each_entry(idp, entry, id) \ #define idr_for_each_entry(idp, entry, id) \
for (id = 0, entry = (typeof(entry))idr_get_next((idp), &(id)); \ for (id = 0; ((entry) = idr_get_next(idp, &(id))) != NULL; ++id)
entry != NULL; \
++id, entry = (typeof(entry))idr_get_next((idp), &(id)))
/* /*
* Don't use the following functions. These exist only to suppress * Don't use the following functions. These exist only to suppress