From: grundler@dsl2.external.hp.com (Grant Grundler)
To: Matthew Wilcox <willy@debian.org>
Cc: Randolph Chung <tausq@debian.org>,
John David Anglin <dave@hiauly1.hia.nrc.ca>,
carlos@baldric.uwo.ca, parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] Re: Trap handler
Date: Mon, 9 Dec 2002 11:03:16 -0700 [thread overview]
Message-ID: <20021209180316.GA6635@dsl2.external.hp.com> (raw)
In-Reply-To: <20021209125416.F20336@parcelfarce.linux.theplanet.co.uk>
On Mon, Dec 09, 2002 at 12:54:16PM +0000, Matthew Wilcox wrote:
> x86 will potentially reschedule on successfully handling a page fault.
ok.
> softirqs seem to only get run if we're returning to userspace,
> unless we're switching tasks. That might be a bug in the x86 code.
ok.
> Judging from the use of cli & sti in the x86 asm, I would venture to
> suggest that the I bit should be cleared. It makes sense anyway --
> you can't expect interrupts to be disabled over a page fault.
The above two statements don't make sense to me.
Clearing I-bit (ie rsm) will disable interrupts.
The second sentence suggests the opposite.
Or did I read it wrong?
thanks,
grant
next prev parent reply other threads:[~2002-12-09 18:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20021208232601.GH21187@tausq.org>
2002-12-08 23:55 ` [parisc-linux] Re: Trap handler John David Anglin
2002-12-09 5:12 ` Randolph Chung
2002-12-09 6:19 ` Randolph Chung
2002-12-09 12:54 ` Matthew Wilcox
2002-12-09 18:03 ` Grant Grundler [this message]
2002-12-09 18:20 ` Matthew Wilcox
2002-12-09 18:41 ` Grant Grundler
2002-12-09 18:55 ` Matthew Wilcox
2002-12-09 16:18 ` John David Anglin
2002-12-09 16:31 ` John David Anglin
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