linux-kernel - Re: [PATCH] zram: Fix the issue that the write

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Message-ID: <bo4g7erropsvl7vulufdsjqlkkbjycaounh2vv4a6urttxvubr@f22z5wlgntox>
Date: Tue, 18 Nov 2025 16:52:23 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Yuwen Chen <ywen.chen@...mail.com>
Cc: senozhatsky@...omium.org, akpm@...ux-foundation.org, 
	bgeffon@...gle.com, licayy@...look.com, linux-block@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, minchan@...nel.org, richardycc@...gle.com
Subject: Re: [PATCH] zram: Fix the issue that the write - back limits might
 overflow

On (25/11/18 15:39), Yuwen Chen wrote:
> Since the value of bd_wb_limit is an unsigned number, when the
> page size is larger than 4 KB, it may cause an out-of-bounds situation.
> 
> This patch fixes the issue by limiting bd_wb_limit to be an
> integer multiple of PAGE_SIZE / 4096.

I really wish we could just change wb code to use PAGE_SIZE not 4K
units [1], unfortunately it's probably too late to change that now.

[1] https://lore.kernel.org/linux-kernel/20251110052741.92031-1-senozhatsky@chromium.org