linux-kernel - Re: [patch 1/4] Configure out AIO support

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Message-ID: <20080805181536.GH22895@cs181140183.pp.htv.fi>
Date:	Tue, 5 Aug 2008 21:15:36 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Bernhard Fischer <rep.dot.nop@...il.com>
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	michael@...e-electrons.com, Matt Mackall <mpm@...enic.com>,
	bcrl@...ck.org, linux-aio@...ck.org, akpm@...ux-foundation.org
Subject: Re: [patch 1/4] Configure out AIO support

On Fri, Aug 01, 2008 at 12:42:22AM +0200, Bernhard Fischer wrote:
> On Thu, Jul 31, 2008 at 01:12:19PM +0300, Adrian Bunk wrote:
> >On Thu, Jul 31, 2008 at 12:09:29PM +0200, Bernhard Fischer wrote:
> >> On Thu, Jul 31, 2008 at 11:27:04AM +0200, Thomas Petazzoni wrote:
> >> >This patchs adds the CONFIG_AIO option which allows to remove support
> >> >for asynchronous I/O operations, that are not necessarly used by
> >> >applications, particularly on embedded devices. As this is a
> >> >size-reduction option, it depends on CONFIG_EMBEDDED. It allows to
> >> >save ~7 kilobytes of kernel code/data:
> >> 
> >> Shouldn't this also make sure not to install aio_abi.h or at least an
> >> empty aio_abi.h?
> >
> >The userspace headers are independent of any kernel configuration
> >(except for the architecture).
> 
> I beg to disagree:
> internals as exposed by e.g. aio_abi.h are impl dependent. Noone except
> the impl and it's users are interrested in it.
>...

That's utter bullshit.

The contents of aio_abi.h is a kernel<->userspace ABI that mustn't ever 
change. [1]

cu
Adrian

[1] there are some exceptions like adding stuff (but not in existing 
    structs), but basically the contents of aio_abi.h is cast in stone

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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