From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: linux-mm@kvack.org
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: mprotect pgprot handling weirdness
Date: Tue, 06 Apr 2010 15:43:42 +1000 [thread overview]
Message-ID: <1270532622.13812.30.camel@pasglop> (raw)
In-Reply-To: <1270530566.13812.28.camel@pasglop>
On Tue, 2010-04-06 at 15:09 +1000, Benjamin Herrenschmidt wrote:
> (*) Right now it's near impossible to add arch specific PROT_* bits to
> mmap/mprotect for fancy things like cachability attributes, or other
> nifty things like reverse-endian mappings that we have on some embedded
> platforms, I'm investigating ways to better separate vm_page_prot from
> vm_flags so some PROT_* bits can go straight to the former without
> having to be mirrored in some way in the later.
The other (easier) option is to make the vm flags always 64-bit and
reserve a range of bits here for the arch to use but I suppose there's
going to be unhappiness about that one :-)
Cheers,
Ben.
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next prev parent reply other threads:[~2010-04-06 5:43 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-06 5:09 mprotect pgprot handling weirdness Benjamin Herrenschmidt
2010-04-06 5:32 ` Benjamin Herrenschmidt
2010-04-06 5:43 ` Benjamin Herrenschmidt [this message]
2010-04-06 5:52 ` KOSAKI Motohiro
2010-04-06 6:07 ` Arch specific mmap attributes (Was: mprotect pgprot handling weirdness) Benjamin Herrenschmidt
2010-04-06 6:24 ` KOSAKI Motohiro
2010-04-06 7:30 ` Benjamin Herrenschmidt
2010-04-06 10:26 ` KOSAKI Motohiro
2010-04-06 22:15 ` Benjamin Herrenschmidt
2010-04-07 6:03 ` KOSAKI Motohiro
2010-04-07 7:03 ` Arch specific mmap attributes David Miller
2010-04-07 7:14 ` KOSAKI Motohiro
2010-04-07 7:18 ` David Miller
2010-04-07 9:00 ` Benjamin Herrenschmidt
2010-04-07 8:58 ` Benjamin Herrenschmidt
2010-04-07 8:56 ` Arch specific mmap attributes (Was: mprotect pgprot handling weirdness) Benjamin Herrenschmidt
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