linux-kernel - Re: [PATCHv2] ARM64:Fix MINSIGSTKSZ and SIGSTKSZ

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Message-ID: <20151006113328.GP6281@e103592.cambridge.arm.com>
Date:	Tue, 6 Oct 2015 12:33:28 +0100
From:	Dave Martin <Dave.Martin@....com>
To:	Andreas Schwab <schwab@...e.de>
Cc:	Arnd Bergmann <arnd@...db.de>, catalin.marinas@....com,
	will.deacon@....com, linux-kernel@...r.kernel.org,
	Akhilesh Kumar <akhilesh.k@...sung.com>,
	Manjeet Pawar <manjeet.p@...sung.com>,
	Rohit Thapliyal <r.thapliyal@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, pankaj.m@...sung.com
Subject: Re: [PATCHv2] ARM64:Fix MINSIGSTKSZ and SIGSTKSZ

On Tue, Oct 06, 2015 at 12:59:45PM +0200, Andreas Schwab wrote:
> Arnd Bergmann <arnd@...db.de> writes:
> 
> > I think it makes sense to stick with the traditional definition
> > of MINSIGSTKSZ == "the minimum amount that you will always need,
> > add whatever you require yourself" and SIGSTKSZ == "Should be
> > enough for a couple of function calls".
> 
> The python3 testsuite wants to put two signal frames in a SIGSTKSZ
> stack.

Whether it's valid to expect SIGSTKSZ to be big enough for that is
debatable.

But I guess that SIGSTKSZ = MINSIGSTKSZ * 4 provides some insurance
against such assumptions (doubtless the python testsuite is not
the only code affected).

Cheers
---Dave

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