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brd: add cond_resched to brd_free_pages 

The loop that frees all the pages can take unbounded amount of time, so
add cond_resched() to it.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Mikulas Patocka 2019-05-09 12:51:27 -06:00 committed by Jens Axboe
parent cf12c6729c
commit 936b33f724
1 changed files with 6 additions and 0 deletions
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6
drivers/block/brd.c
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@ -152,6 +152,12 @@ static void brd_free_pages(struct brd_device *brd)
pos++;
/*
* It takes 3.4 seconds to remove 80GiB ramdisk.
* So, we need cond_resched to avoid stalling the CPU.
*/
cond_resched();
/*
* This assumes radix_tree_gang_lookup always returns as
* many pages as possible. If the radix-tree code changes,