From: Ralf Baechle <ralf@linux-mips.org>
To: Peter Horton <pdh@colonel-panic.org>
Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
Subject: Re: Possible shared mapping bug in 2.4.23 (at least MIPS/Sparc)
Date: Sat, 13 Dec 2003 17:05:36 +0100 [thread overview]
Message-ID: <20031213160536.GA13271@linux-mips.org> (raw)
In-Reply-To: <20031213114134.GA9896@skeleton-jack>
On Sat, Dec 13, 2003 at 11:41:34AM +0000, Peter Horton wrote:
> The current MIPS 2.4 kernel (from CVS) currently allows fixed shared
> mappings to violate D-cache aliasing constraints.
>
> The check for illegal fixed mappings is done in
> arch_get_unmapped_area(), but these mappings are granted in
> get_unmapped_area() and arch_get_unmapped_area() is never called.
>
> A quick look at sparc and sparc64 seem to show the same problem.
Ehh... <asm/pgtable.h> defines HAVE_ARCH_UNMAPPED_AREA therefore
get_unmapped_area calls the arch's version of arch_get_unmapped_area
instead of the generic version in mm/mmap.c
Ralf
next prev parent reply other threads:[~2003-12-13 16:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-13 11:41 Possible shared mapping bug in 2.4.23 (at least MIPS/Sparc) Peter Horton
2003-12-13 16:05 ` Ralf Baechle [this message]
2003-12-13 18:08 ` Peter Horton
2003-12-13 22:26 ` Jamie Lokier
2003-12-14 1:41 ` Linus Torvalds
2003-12-14 4:20 ` Jamie Lokier
2003-12-14 10:38 ` Peter Horton
2003-12-14 17:16 ` Jamie Lokier
2003-12-25 13:03 ` Ralf Baechle
2003-12-14 18:05 ` Linus Torvalds
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20031213160536.GA13271@linux-mips.org \
--to=ralf@linux-mips.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@linux-mips.org \
--cc=pdh@colonel-panic.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.