The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x d37da422edb0664a2037e6d7d42fe6d339aae78a # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024120622-entryway-geologic-5d23@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From d37da422edb0664a2037e6d7d42fe6d339aae78a Mon Sep 17 00:00:00 2001 From: Sergey Senozhatsky senozhatsky@chromium.org Date: Tue, 29 Oct 2024 00:36:15 +0900 Subject: [PATCH] zram: clear IDLE flag in mark_idle()

If entry does not fulfill current mark_idle() parameters, e.g. cutoff time, then we should clear its ZRAM_IDLE from previous mark_idle() invocations.

Consider the following case: - mark_idle() cutoff time 8h - mark_idle() cutoff time 4h - writeback() idle - will writeback entries with cutoff time 8h, while it should only pick entries with cutoff time 4h

The bug was reported by Shin Kawamura.

Link: https://lkml.kernel.org/r/20241028153629.1479791-3-senozhatsky@chromium.org Fixes: 755804d16965 ("zram: introduce an aged idle interface") Signed-off-by: Sergey Senozhatsky senozhatsky@chromium.org Reported-by: Shin Kawamura kawasin@google.com Acked-by: Brian Geffon bgeffon@google.com Cc: Minchan Kim minchan@kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Cc: stable@vger.kernel.org

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index a16dbffcdca3..cee49bb0126d 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -410,6 +410,8 @@ static void mark_idle(struct zram *zram, ktime_t cutoff) #endif if (is_idle) zram_set_flag(zram, index, ZRAM_IDLE); + else + zram_clear_flag(zram, index, ZRAM_IDLE); zram_slot_unlock(zram, index); } }