linux-kernel - Re: [PATCH 7/12] i386 sg: add support for chaining scatterlists

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Message-ID: <a781481a0705100623s53730502kc5470b6dc6fc6a45@mail.gmail.com>
Date:	Thu, 10 May 2007 18:53:28 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Jens Axboe" <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 7/12] i386 sg: add support for chaining scatterlists

On 5/10/07, Jens Axboe <jens.axboe@...cle.com> wrote:
> [...]
> +static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
> +                           struct scatterlist *sgl)
> +{
> +#ifndef ARCH_HAS_SG_CHAIN
> +       BUG();
> +#endif

Hmmm ... so we better also make sure all users call this from within
an "#ifdef ARCH_HAS_SG_CHAIN" themselves (or else make this a config
option defined in the arch/.../defconfig of archs that support this
and then make the calling code's Kconfig option "depends on ... &&
ARCH_FOO").

(Just saw a previous thread, Andrew seems to have beaten me to this observation)
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