linux-kernel - Re: [RFC] TIF_NOTIFY_RESUME, arch/*/*/*signal*.c and all such

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Message-ID: <20120429180926.GA6871@ZenIV.linux.org.uk>
Date:	Sun, 29 Apr 2012 19:09:26 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Roland McGrath <roland@...k.frob.com>
Subject: Re: [RFC] TIF_NOTIFY_RESUME, arch/*/*/*signal*.c and all such

On Sun, Apr 29, 2012 at 06:41:55PM +0200, Oleg Nesterov wrote:
> On 04/27, Al Viro wrote:
> >
> > 	BTW, I'm somewhat tempted to do the following: *ALL* calls of
> > tracehook_signal_handler() are now immediately preceded by block_signals().
> > Moreover, tracehook_signal_handler(...., 0) is currently a no-op, so
> > it could be painlessly added after the remaining block_signals() instances.
> > How about *folding* block_signals() (along with clear_restore_sigmask())
> > into tracehook_signal_handler()?
> 
> Oh, please no. Imho, these two have nothing to do with each other.
> 
> Besides, at least on x86 tracehook_signal_handler's logic is not exactly
> right and should be fixed.

Details, please...

> And we are going to kill tracehook.h. While personally I do not think
> this is the good idea, but the matter of fact is that tracehooks are
> already destroyed.

See signal.git#master.  I ended up with
	signal_delivered(<tracehook_signal_handler arguments>)
and that sucker does both things.  The funny thing is, block_sigmask()
(apologies for typo above) is not used anywhere else...
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