linux-kernel - Re: [GIT] Sparc

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Message-ID: <AANLkTi=pJUKRUQhpcVV8XAJF+BO1440v1Py5Opr34DR1@mail.gmail.com>
Date:	Wed, 22 Sep 2010 12:08:53 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT] Sparc

On Wed, Sep 22, 2010 at 11:53 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Um, no.  You've *already* called get_signal_to_deliver().  There had been
> no SIGSEGV in sight.  You happily went on to set a sigframe for e.g.
> SIGHUP, but ran out of stack.  At that point you get force_sigsegv()
> from handle_signal().  _NOW_ you have a pending SIGSEGV

Ahh. Ok. Different case from the one I thought you were worried about.
And yeah, I guess that one does require us to mess with the low-level
asm code (although I do wonder if we could not make the whole
do_notify_resume + reschedule code be generic C code - it's a lot of
duplicated subtle asm as it is).

                   Linus
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