From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: Philipp Rumpf <prumpf@mathe.stud.uni-erlangen.de>
Cc: Matthew Wilcox <Matthew.Wilcox@genedata.com>,
parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] pgtable.h:acc_rights()
Date: Sat, 6 Nov 1999 21:48:59 +0100 [thread overview]
Message-ID: <19991106214859.A1743@alpha.franken.de> (raw)
In-Reply-To: <19991106205125.L11609@mathe.stud.uni-erlangen.de>; from Philipp Rumpf on Sat, Nov 06, 1999 at 08:51:25PM +0100
On Sat, Nov 06, 1999 at 08:51:25PM +0100, Philipp Rumpf wrote:
> > Why is acc_rights written like this?
>
> See my commit message. Basically that works around the "pages mapped
> read-only when they should be read-write" problem Thomas reported.
the real problem is, that we don't have a working copy on write at the
moment. So whenever the first access to COW page is a read access, every
write access afterwards will lead to an unhandled page fault (which causes
a panic at the moment).
Thomas.
--
This device has completely bogus header. Compaq scores again :-|
It's a host bridge, but it should be called ghost bridge instead ;^)
[Martin `MJ' Mares on linux-kernel]
next prev parent reply other threads:[~1999-11-06 20:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-11-06 16:20 [parisc-linux] pgtable.h:acc_rights() Matthew Wilcox
1999-11-06 19:51 ` Philipp Rumpf
1999-11-06 20:48 ` Thomas Bogendoerfer [this message]
1999-11-07 13:02 ` Philipp Rumpf
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