This is a note to let you know that I've just added the patch titled
dm writecache: add cond_resched to loop in persistent_memory_claim()
to the 5.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-writecache-add-cond_resched-to-loop-in-persistent_memory_claim.patch
and it can be found in the queue-5.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d35bd764e6899a7bea71958f08d16cea5bfa1919 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date: Fri, 19 Jun 2020 11:51:34 -0400
Subject: dm writecache: add cond_resched to loop in persistent_memory_claim()
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
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: 48debafe4f2fe ("dm: add writecache target")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-writecache.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -286,6 +286,8 @@ static int persistent_memory_claim(struc
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);
Patches currently in stable-queue which might be from mpatocka@xxxxxxxxxx are
queue-5.7/dm-writecache-add-cond_resched-to-loop-in-persistent_memory_claim.patch
queue-5.7/dm-writecache-correct-uncommitted_block-when-discarding-uncommitted-entry.patch
