linux-kernel - Re: hexagon: signal handling bugs

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Date:	Wed, 15 Feb 2012 12:18:07 -0600
From:	Linas Vepstas <linasvepstas@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Richard Kuo <rkuo@...eaurora.org>, linux-kernel@...r.kernel.org,
	linux-hexagon@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: hexagon: signal handling bugs

On 11 February 2012 17:27, Al Viro <viro@...iv.linux.org.uk> wrote:
>        1) unless I'm seriously misreading hexagon vm_entry.S, once we'd
> called do_notify_resume, we do *not* recheck if there's more work to
> be done.

>        2) sigreturn should *NOT* be restartable at all, or you'll get
....

Is there an architecture that "does this best"?  I (re-)wrote a
significant part of the hexagon sig-handling code, and I did it via
"surgical hacking": by reading the code for 4-6 other arches, and
trying to pick out the "best practices" of each.  But its easy to
build a Frankenstein when using body parts from mis-matched places, so
perhaps many of these mistakes were mine...

Perhaps its desirable to modify most/all architectures, so as to evoke
more commonality?  Some of the other, more minor arches sure did look
incomplete to me...

-- Linas
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