This is a note to let you know that I've just added the patch titled
brd: use radix_tree_maybe_preload instead of radix_tree_preload
to the 6.2-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:
brd-use-radix_tree_maybe_preload-instead-of-radix_tree_preload.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0aa2988e4fd23c0c8b33999d7b47dfbc5e6bf24b Mon Sep 17 00:00:00 2001
From: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
Date: Fri, 17 Feb 2023 17:44:44 +0530
Subject: brd: use radix_tree_maybe_preload instead of radix_tree_preload
From: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
commit 0aa2988e4fd23c0c8b33999d7b47dfbc5e6bf24b upstream.
Unconditionally calling radix_tree_preload_end() results in a OOPS
message as the preload is only conditionally called for
gfpflags_allow_blocking().
[ 20.267323] BUG: using smp_processor_id() in preemptible [00000000] code: fio/416
[ 20.267837] caller is brd_insert_page.part.0+0xbe/0x190 [brd]
[ 20.269436] Call Trace:
[ 20.269598] <TASK>
[ 20.269742] dump_stack_lvl+0x32/0x50
[ 20.269982] check_preemption_disabled+0xd1/0xe0
[ 20.270289] brd_insert_page.part.0+0xbe/0x190 [brd]
[ 20.270664] brd_submit_bio+0x33f/0xf40 [brd]
Use radix_tree_maybe_preload() which does preload only if
gfpflags_allow_blocking() is true but also takes the lock. Therefore,
unconditionally calling radix_tree_preload_end() should not create any
issues and the message disappears.
Fixes: 6ded703c56c2 ("brd: check for REQ_NOWAIT and set correct page allocation mask")
Signed-off-by: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230217121442.33914-1-p.raghav@xxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/brd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -94,7 +94,7 @@ static int brd_insert_page(struct brd_de
if (!page)
return -ENOMEM;
- if (gfpflags_allow_blocking(gfp) && radix_tree_preload(gfp)) {
+ if (radix_tree_maybe_preload(gfp)) {
__free_page(page);
return -ENOMEM;
}
Patches currently in stable-queue which might be from p.raghav@xxxxxxxxxxx are
queue-6.2/brd-use-radix_tree_maybe_preload-instead-of-radix_tree_preload.patch
queue-6.2/brd-mark-as-nowait-compatible.patch
