From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Minchan Kim <minchan@kernel.org>,
Brian Geffon <bgeffon@google.com>,
Richard Chang <richardycc@google.com>,
linux-block@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] zram: do not slot_free() written-back slots
Date: Thu, 19 Mar 2026 13:05:55 +0900 [thread overview]
Message-ID: <abt1dsjsT9826Ewy@google.com> (raw)
In-Reply-To: <20260319034912.1894770-1-senozhatsky@chromium.org>
As a side note:
On (26/03/19 12:44), Sergey Senozhatsky wrote:
> - slot_free(zram, index);
[..]
> - if (huge)
> - set_slot_flag(zram, index, ZRAM_HUGE);
Original code had a bug. slot_free() would decrement ->huge_pages,
then writeback completion would restore the HUGE flag, so when slot
would get freed for real slot_free() would decrement ->huge_pages
again, leading to underflow.
next prev parent reply other threads:[~2026-03-19 4:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-19 3:44 [PATCH] zram: do not slot_free() written-back slots Sergey Senozhatsky
2026-03-19 4:05 ` Sergey Senozhatsky [this message]
2026-03-19 6:47 ` Richard Chang
2026-03-19 7:21 ` Sergey Senozhatsky
2026-03-19 17:59 ` Minchan Kim
2026-03-19 19:43 ` Minchan Kim
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