linux-kernel - Re: [PATCH 2/2] 32-bit ABI: introduce ARCH_32BIT_OFF

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Message-ID: <alpine.DEB.2.11.1512291249030.28591@nanos>
Date:	Tue, 29 Dec 2015 12:49:33 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Yury Norov <ynorov@...iumnetworks.com>
cc:	arnd@...db.de, cmetcalf@...hip.com, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, klimov.linux@...il.com
Subject: Re: [PATCH 2/2] 32-bit ABI: introduce ARCH_32BIT_OFF_T config
 option

On Tue, 29 Dec 2015, Yury Norov wrote:

> All new 32-bit architectures should have 64-bit off_t type, but existing
> architectures has 32-bit ones.
> 
> To handle it, new config option is added to arch/Kconfig that defaults
> ARCH_32BIT_OFF_T to be disabled for non-64 bit architectures. All existing
> 32-bit architectures enable it explicitly here.
> 
> New option affects force_o_largefile() behaviour. Namely, if off_t is
> 64-bits long, we have no reason to reject user to open big files.
> 
> Note that even if architectures has only 64-bit off_t in the kernel
> (arc, c6x, h8300, hexagon, metag, nios2, openrisc, tile32 and unicore32),
> a libc may use 32-bit off_t, and therefore want to limit the file size
> to 4GB unless specified differently in the open flags.

For the x86 part: Acked-by: Thomas Gleixner <tglx@...utronix.de>
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