linux-kernel - Re: [PATCH v6 14/19] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

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Date:	Wed, 2 Dec 2015 03:24:30 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Andreas Schwab <schwab@...e.de>,
	<linux-arm-kernel@...ts.infradead.org>, <pinskia@...il.com>,
	<Prasun.Kapoor@...iumnetworks.com>, <catalin.marinas@....com>,
	<Nathan_Lynch@...tor.com>, <linux-kernel@...r.kernel.org>,
	<agraf@...e.de>, <klimov.linux@...il.com>, <broonie@...nel.org>,
	<jan.dakinevich@...il.com>, <joseph@...esourcery.com>,
	<ddaney.cavm@...il.com>, <bamvor.zhangjian@...wei.com>,
	<philipp.tomsich@...obroma-systems.com>,
	<andrey.konovalov@...aro.org>,
	<christoph.muellner@...obroma-systems.com>
Subject: Re: [PATCH v6 14/19] arm64:ilp32: add sys_ilp32.c and a separate
 table (in entry.S) to use it

On Tue, Dec 01, 2015 at 12:30:56PM +0100, Arnd Bergmann wrote:
> On Tuesday 01 December 2015 12:01:12 Andreas Schwab wrote:
> > Arnd Bergmann <arnd@...db.de> writes:
> > 
> > > On Tuesday 01 December 2015 10:20:59 Andreas Schwab wrote:
> > >> Yury Norov <ynorov@...iumnetworks.com> writes:
> > >> 
> > >> > There's a tricky bug with signal stack, that Andreas also discovered.
> > >> 
> > >> That was only a confusion about the compat state of sys_rt_sigaction.
> > >> It just requires making sure glibc uses the correct (64bit layout)
> > >> struct kernel_sigaction.
> > >
> > > I don't think we need to use the 64-bit version of sigaction, both
> > > kernel and libc are simpler if we use the normal 32-bit version.
> > 
> > Since glibc has to do the conversion anyway (due to sigset_t), using the
> > 64bit layout avoids a second conversion in the kernel.
> 
> I don't get the part about sigset_t. Why would glibc want to use the
> 64-bit layout? This one looks like one of the cases where we absolutely
> want to use the 32-bit layout or otherwise get into big trouble if
> we ever want to support native ILP32 kernels.
> 
> 	Arnd

So, we drop patch #6, and use 32-bit layout for all signal structures.

Correct?
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