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dm writecache: add cond_resched to loop in persistent_memory_claim() 

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

Fixes: 48debafe4f ("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>
This commit is contained in:
Mikulas Patocka 2020-06-19 11:51:34 -04:00 committed by Mike Snitzer
parent f2cd9a5e85
commit d35bd764e6
1 changed files with 2 additions and 0 deletions
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2
drivers/md/dm-writecache.c
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@ -282,6 +282,8 @@ static int persistent_memory_claim(struct dm_writecache *wc)
while (daa-- && i < p) { while (daa-- && i < p) {
pages[i++] = pfn_t_to_page(pfn); pages[i++] = pfn_t_to_page(pfn);
pfn.val++; pfn.val++;
if (!(i & 15))
cond_resched();
} }
} while (i < p); } while (i < p);
wc->memory_map = vmap(pages, p, VM_MAP, PAGE_KERNEL); wc->memory_map = vmap(pages, p, VM_MAP, PAGE_KERNEL);