From: Zwane Mwaikambo <zwane@arm.linux.org.uk>
To: Matt Mackall <mpm@selenic.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [1/2] random: SMP locking
Date: Sat, 2 Aug 2003 11:02:53 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.53.0308021102260.3473@montezuma.mastecende.com> (raw)
In-Reply-To: <20030802144310.GH22824@waste.org>
On Sat, 2 Aug 2003, Matt Mackall wrote:
> On Sat, Aug 02, 2003 at 08:35:22AM -0400, Zwane Mwaikambo wrote:
> > On Sat, 2 Aug 2003, Andrew Morton wrote:
> > > Cannot perform userspace access while holding a lock - a pagefault could
> > > occur, perform IO, schedule away and the same CPU tries to take the same
> > > lock via a different process.
> >
> > Perhaps might_sleep() in *_user, copy_* etc is in order?
>
> Wouldn't have caught this case - this interface hasn't actually been
> used/useful for many years as it only gives access to one of the
> pools and has never been atomic either.
Aha, thanks for the explanation.
Zwane
--
function.linuxpower.ca
next prev parent reply other threads:[~2003-08-02 15:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-02 4:24 [PATCH] [1/2] random: SMP locking Oliver Xymoron
2003-08-02 11:00 ` Andrew Morton
2003-08-02 12:35 ` Zwane Mwaikambo
2003-08-02 14:43 ` Matt Mackall
2003-08-02 15:02 ` Zwane Mwaikambo [this message]
2003-08-02 18:39 ` Andrew Morton
2003-08-02 18:42 ` Matt Mackall
2003-08-02 14:32 ` Matt Mackall
2003-08-02 19:00 ` Andrew Morton
2003-08-02 19:33 ` Matt Mackall
2003-08-02 19:46 ` Andrew Morton
2003-08-02 20:14 ` Matt Mackall
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=Pine.LNX.4.53.0308021102260.3473@montezuma.mastecende.com \
--to=zwane@arm.linux.org.uk \
--cc=akpm@osdl.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mpm@selenic.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).