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| author | Catalin Marinas <catalin.marinas@arm.com> | 2015-09-14 18:16:02 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-09-23 11:00:57 -0600 |
| commit | f75782e4e067fd68249635699cb20dfe0489d743 (patch) | |
| tree | 9e8ed77c60570d04b8af9ce097bfbed26e4b19df | |
| parent | bcee19f424a0d8c26ecf2607b73c690802658b29 (diff) | |
| download | linux-stable-f75782e4e067fd68249635699cb20dfe0489d743.tar.gz linux-stable-f75782e4e067fd68249635699cb20dfe0489d743.tar.bz2 linux-stable-f75782e4e067fd68249635699cb20dfe0489d743.zip | |
block: kmemleak: Track the page allocations for struct request
The pages allocated for struct request contain pointers to other slab
allocations (via ops->init_request). Since kmemleak does not track/scan
page allocations, the slab objects will be reported as leaks (false
positives). This patch adds kmemleak callbacks to allow tracking of such
pages.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Bart Van Assche <bart.vanassche@sandisk.com>
Tested-by: Bart Van Assche<bart.vanassche@sandisk.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-mq.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index f2d67b4047a0..2077f0d2f95f 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -9,6 +9,7 @@ #include <linux/backing-dev.h> #include <linux/bio.h> #include <linux/blkdev.h> +#include <linux/kmemleak.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/slab.h> @@ -1438,6 +1439,11 @@ static void blk_mq_free_rq_map(struct blk_mq_tag_set *set, while (!list_empty(&tags->page_list)) { page = list_first_entry(&tags->page_list, struct page, lru); list_del_init(&page->lru); + /* + * Remove kmemleak object previously allocated in + * blk_mq_init_rq_map(). + */ + kmemleak_free(page_address(page)); __free_pages(page, page->private); } @@ -1510,6 +1516,11 @@ static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set, list_add_tail(&page->lru, &tags->page_list); p = page_address(page); + /* + * Allow kmemleak to scan these pages as they contain pointers + * to additional allocations like via ops->init_request(). + */ + kmemleak_alloc(p, order_to_size(this_order), 1, GFP_KERNEL); entries_per_page = order_to_size(this_order) / rq_size; to_do = min(entries_per_page, set->queue_depth - i); left -= to_do * rq_size; |