linux-kernel - Re: [PATCH] mm: make read-only accessors take const parameters

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]

Date:	Fri, 15 Apr 2011 09:51:18 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Phil Carmody <ext-phil.2.carmody@...ia.com>
cc:	akpm@...ux-foundation.org, aarcange@...hat.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: make read-only accessors take const parameters

On Fri, 15 Apr 2011, Phil Carmody wrote:

> +++ b/include/linux/mm.h
> @@ -353,9 +353,16 @@ static inline struct page *compound_head(struct page *page)
>  	return page;
>  }
>
> -static inline int page_count(struct page *page)
> +static inline const struct page *compound_head_ro(const struct page *page)
>  {
> -	return atomic_read(&compound_head(page)->_count);
> +	if (unlikely(PageTail(page)))
> +		return page->first_page;
> +	return page;
> +}

Can you make compound_head take a const pointer too to avoid this?

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/