linux-kernel - Re: [PATCH 1/2] mm/zsmalloc: don't hold locks of all pages when free

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240228061400.GL11972@google.com>
Date: Wed, 28 Feb 2024 15:14:00 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Chengming Zhou <zhouchengming@...edance.com>
Cc: yosryahmed@...gle.com, Sergey Senozhatsky <senozhatsky@...omium.org>,
	hannes@...xchg.org, nphamcs@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 1/2] mm/zsmalloc: don't hold locks of all pages when
 free_zspage()

On (24/02/27 03:02), Chengming Zhou wrote:
> @@ -834,13 +841,12 @@ static void __free_zspage(struct zs_pool *pool, struct size_class *class,
>  		VM_BUG_ON_PAGE(!PageLocked(page), page);
>  		next = get_next_page(page);
>  		reset_page(page);

reset_page()->__ClearPageMovable()->PageMovable() expects page to be
locked.

> -		unlock_page(page);
>  		dec_zone_page_state(page, NR_ZSPAGES);
>  		put_page(page);
>  		page = next;
>  	} while (page != NULL);