From: Russell King <rmk@arm.linux.org.uk>
To: Pavel Machek <pavel@ucw.cz>
Cc: David Woodhouse <dwmw2@infradead.org>, linux-kernel@vger.kernel.org
Subject: Re: JFFS2 swsusp / signal cleanup.
Date: Sun, 5 Oct 2003 17:19:16 +0100 [thread overview]
Message-ID: <20031005171916.B21478@flint.arm.linux.org.uk> (raw)
In-Reply-To: <20031005161155.GA753@elf.ucw.cz>; from pavel@ucw.cz on Sun, Oct 05, 2003 at 06:11:55PM +0200
On Sun, Oct 05, 2003 at 06:11:55PM +0200, Pavel Machek wrote:
> Is flush_signals() really so stupid to do? Goal was to make
> modifications to code as simple as possible, and as most pieces do not
> expect to be interrupted, pretending signal never happened seems like
> good idea...
What if that signal was necessary for the operation of the thread, and
dropping it would cause a problem?
Since you're effectively using signal handling to cause a false pending
signal indication, surely the correct cleanup is to re-calculate the
pending signal indication. That way, we won't be throwing away signals.
I'm also wondering if there could be a problem with (ab)using TASK_STOPPED
here - could a stopped task be woken prematurely and thereby sent spinning
in refrigerator() by a non-stopped process sending a SIGCONT at just the
right time?
Maybe we want a TASK_FROZEN state to describe the "frozen, may not be woken
by anything except thawing" state?
--
Russell King (rmk@arm.linux.org.uk) http://www.arm.linux.org.uk/personal/
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/
2.6 Serial core
next prev parent reply other threads:[~2003-10-05 16:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-04 11:25 JFFS2 swsusp / signal cleanup David Woodhouse
2003-10-05 16:11 ` Pavel Machek
2003-10-05 16:19 ` Russell King [this message]
2003-10-05 19:13 ` Pavel Machek
2003-10-05 20:07 ` David Woodhouse
2003-10-09 0:23 ` [pm] " Pavel Machek
2003-10-09 0:29 ` David Woodhouse
2003-10-09 9:24 ` Pavel Machek
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