linux-kernel - Re: pte_offset_map for ppc assumes HIGHPTE

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: <200707251830.21944.dave.mccracken@oracle.com>
Date:	Wed, 25 Jul 2007 18:30:21 -0500
From:	Dave McCracken <dave.mccracken@...cle.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Andreas Schwab <schwab@...e.de>, Satya <satyakiran@...il.com>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: pte_offset_map for ppc assumes HIGHPTE

On Wednesday 25 July 2007, Benjamin Herrenschmidt wrote:
> Depends... if you have CONFIG_HIGHMEM and not CONFIG_HIGHPTE, you are
> wasting time going through kmap_atomic unnecessarily no ? it will probably
> not do anything because the PTE page is in lowmem but still...

Probably not much time.  You still need to do the page to virtual translation, 
which kmap_atomic does for you.

Dave McCracken
-
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/