From: Anton Vorontsov <avorontsov@ru.mvista.com>
To: linux-ide@vger.kernel.org
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>, Ingo Molnar <mingo@elte.hu>,
Sergei Shtylyov <sshtylyov@ru.mvista.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH -rt] ide: fix interrupts processing issue with preempt-able hardirqs
Date: Tue, 24 Jun 2008 03:52:54 +0400 [thread overview]
Message-ID: <20080623235254.GA10728@polina.dev.rtsoft.ru> (raw)
In-Reply-To: <20080623234037.GA6793@polina.dev.rtsoft.ru>
On Tue, Jun 24, 2008 at 03:40:37AM +0400, Anton Vorontsov wrote:
> IDE interrupt handler relies on the fact that, if necessary, hardirqs
> will re-trigger on ISR exit. With fully preemtable IRQs this seems to be
> not true, since if hardirq thread is currently running, and the same IRQ
> raised again, then this IRQ will be simply lost.
Btw, I don't actually understand why interrupt "simply lost", IMO it
should not.. :-/ But this what I'm observing via bunch of printks in
the code flow. Maybe there is not so obvious race, which I can't see.
So, help needed. Either it is a proper fix, or it is a workaround for
another bug somewhere else.
--
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2
prev parent reply other threads:[~2008-06-23 23:52 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-23 23:40 [PATCH -rt] ide: fix interrupts processing issue with preempt-able hardirqs Anton Vorontsov
2008-06-23 23:51 ` Ingo Molnar
2008-06-24 0:00 ` Anton Vorontsov
2008-06-25 12:34 ` Anton Vorontsov
2008-06-25 12:32 ` Alan Cox
2008-06-25 14:12 ` Anton Vorontsov
2008-06-25 13:15 ` Sergei Shtylyov
2008-06-25 14:22 ` Anton Vorontsov
2008-06-25 14:32 ` Alan Cox
2008-06-25 15:26 ` Anton Vorontsov
2008-06-25 14:59 ` Anton Vorontsov
2008-06-28 0:54 ` [PATCH v2 -rt] ide: workaround buggy hardware issues with preemptable hardirqs Anton Vorontsov
2008-06-28 1:09 ` Anton Vorontsov
2008-06-28 9:15 ` Alan Cox
2008-06-28 9:14 ` Alan Cox
2008-06-28 10:43 ` Sergei Shtylyov
2008-06-29 12:49 ` Alan Cox
2008-06-29 13:17 ` Sergei Shtylyov
2008-06-29 14:23 ` Anton Vorontsov
2008-06-28 10:30 ` Sergei Shtylyov
2008-06-28 11:31 ` Anton Vorontsov
2008-06-28 11:52 ` Sergei Shtylyov
2008-06-29 23:26 ` Benjamin Herrenschmidt
2008-06-30 19:01 ` [RT] MPIC edge sensitive issues with hardirq preemption (was: Re: [PATCH v2 -rt] ide: workaround buggy hardware issues with preemptable hardirqs) Anton Vorontsov
2008-06-30 21:59 ` Benjamin Herrenschmidt
2008-06-30 22:37 ` Anton Vorontsov
2008-07-01 10:41 ` [RT] MPIC edge sensitive issues with hardirq preemption Sergei Shtylyov
2008-07-01 11:34 ` Anton Vorontsov
2008-06-23 23:52 ` Anton Vorontsov [this message]
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=20080623235254.GA10728@polina.dev.rtsoft.ru \
--to=avorontsov@ru.mvista.com \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=bzolnier@gmail.com \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=sshtylyov@ru.mvista.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 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.