Re: [PATCH 2/2] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH 2/2] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option
Date	2015-12-29 13:00 +0100
Message-ID	<qL16z-8ud-3@gated-at.bofh.it> (permalink)
References	<qKYLo-6Xt-7@gated-at.bofh.it> <qKYV3-71t-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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@linutronix.de>
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[PATCH v2 0/2] ABI: handle 32-bit off_t for 32-bit and compat ABIs Yury Norov <ynorov@caviumnetworks.com> - 2015-12-29 10:30 +0100
  [PATCH 2/2] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option Yury Norov <ynorov@caviumnetworks.com> - 2015-12-29 10:40 +0100
    Re: [PATCH 2/2] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option Arnd Bergmann <arnd@arndb.de> - 2015-12-29 12:10 +0100
      Re: [PATCH 2/2] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option Yury Norov <ynorov@caviumnetworks.com> - 2015-12-29 12:50 +0100
        Re: [PATCH 2/2] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option Arnd Bergmann <arnd@arndb.de> - 2015-12-29 15:00 +0100
    Re: [PATCH 2/2] 32-bit ABI: introduce ARCH_32BIT_OFF_T config  option Thomas Gleixner <tglx@linutronix.de> - 2015-12-29 13:00 +0100

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