Commit 6cd52ae3 authored Jun 19, 2020 by Mikulas Patocka Committed by Sasha Levin Jun 30, 2020

dm writecache: add cond_resched to loop in persistent_memory_claim()



commit d35bd764e6899a7bea71958f08d16cea5bfa1919 upstream.

Add cond_resched() to a loop that fills in the mapper memory area
because the loop can be executed many times.

Fixes: 48debafe ("dm: add writecache target")
Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent a33e2d0a

drivers/md/dm-writecache.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -281,6 +281,8 @@ static int persistent_memory_claim(struct dm_writecache *wc)
		while (daa-- && i < p) {
		pages[i++] = pfn_t_to_page(pfn);
		pfn.val++;
		if (!(i & 15))
		cond_resched();
		}
		} while (i < p);
		wc->memory_map = vmap(pages, p, VM_MAP, PAGE_KERNEL);