linux-kernel - Re: [PATCH v4 09/17] x86/entry: Add new, comprehensible entry and exit hooks

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Message-ID: <20150702162528.GK4001@pd.tnic>
Date:	Thu, 2 Jul 2015 18:25:28 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Kees Cook <keescook@...omium.org>,
	Brian Gerst <brgerst@...il.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4 09/17] x86/entry: Add new, comprehensible entry and
 exit hooks

On Thu, Jul 02, 2015 at 09:03:11AM -0700, Andy Lutomirski wrote:
> Nothing, actually.  We could spin forever if we keep scheduling in and
> having TIF_NEED_RESCHED get set before we check again, or we could
> even, in principle, keep delivering more and more signals forever.
> This seems quite unlikely, though, and if we really end up delivering
> infinite signals, something is very wrong already.

And if it hasn't happened already with the current code, then I guess
we're always catching a break. And it's not like we're not preemptible
for the whole looping duration so not a problem even for -RT.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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