linux-kernel - Re: [PATCH v6 12/20] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

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Date:	Mon, 21 Dec 2015 23:31:57 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Yury Norov <ynorov@...iumnetworks.com>, catalin.marinas@....com,
	linux-kernel@...r.kernel.org, pinskia@...il.com,
	Prasun.Kapoor@...iumnetworks.com, schwab@...e.de,
	broonie@...nel.org, Nathan_Lynch@...tor.com, agraf@...e.de,
	klimov.linux@...il.com,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
	jan.dakinevich@...il.com, Andrew Pinski <apinski@...ium.com>,
	ddaney.cavm@...il.com, bamvor.zhangjian@...wei.com,
	philipp.tomsich@...obroma-systems.com, joseph@...esourcery.com,
	christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH v6 12/20] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

On Tuesday 15 December 2015, Yury Norov wrote:
> +
> +#define compat_sys_open_by_handle_at   sys_open_by_handle_at
> +#define compat_sys_openat              sys_openat
> +

One more thing I just remembered: I think we want this behavior for all new
32-bit architectures, it was a bug to call compat_sys_openat for the generic
syscall table, as we don't support 32-bit off_t.

Could you split this out into a separate patch that does these changes:

- change the default asm-generic/unistd.h to use sys_openat/sys_open_by_handle_at
- change tile to override those two to keep the current (suboptimal) behavior
- change the force_o_largefile() definition so it defaults to true for all future
  architectures. The easiest way is probably to add a Kconfig symbol for this
  that gets selected by all 32-bit architectures, so we can use

#define force_o_largefile() ((BITS_PER_LONG != 32) || !IS_ENABLED(CONFIG_ARCH_32BIT_OFF_T))

	Arnd
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