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Date: Tue, 6 Oct 2015 12:33:28 +0100
From: Dave Martin <Dave.Martin@arm.com>
To: Andreas Schwab <schwab@suse.de>
Cc: Arnd Bergmann <arnd@arndb.de>, catalin.marinas@arm.com,
        will.deacon@arm.com, linux-kernel@vger.kernel.org,
        Akhilesh Kumar <akhilesh.k@samsung.com>,
        Manjeet Pawar <manjeet.p@samsung.com>,
        Rohit Thapliyal <r.thapliyal@samsung.com>,
        linux-arm-kernel@lists.infradead.org, pankaj.m@samsung.com
Subject: Re: [PATCHv2] ARM64:Fix MINSIGSTKSZ and SIGSTKSZ
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On Tue, Oct 06, 2015 at 12:59:45PM +0200, Andreas Schwab wrote:
> Arnd Bergmann <arnd@arndb.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