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:	Tue, 01 Dec 2015 12:01:12 +0100
From:	Andreas Schwab <schwab@...e.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Yury Norov <ynorov@...iumnetworks.com>,
	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

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.

> We should always default to using the generic 32-bit structures
> unless there is a strong reason not to.

The goal should be to avoid conversion layers where it makes sense.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@...e.de
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