linux-kernel - Re: [PATCH] - Mapping ACPI tables as CACHED

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:	Thu, 16 Dec 2010 21:54:44 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	Jack Steiner <steiner@....com>
Cc:	hpa@...or.com, Henrique de Moraes Holschuh <hmh@....eng.br>,
	tony.luck@...il.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, gbeshers@....com
Subject: Re: [PATCH] - Mapping ACPI tables as CACHED

> I'll bet we can improve the boot sequence so that
> some of the stuff we do before we have cached mappings
> we can do with cached mappings...

Nope, that is a losing bet...

The early mappings are temporary, but they are cached,
for they use __pgprot(__PAGE_KERNEL_IO), which is 
(__PAGE_KERNEL | _PAGE_IOMAP)

rather than __pgprot(__PAGE_KERNEL_IO_NOCACHE) or its variants.

We just need to update the permanent mappings to match.

cheers,
Len Brown, Intel Open Source Technology Center

--
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/