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Date:	Fri, 4 Mar 2016 14:53:49 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>,
	Alasdair G Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, axboe@...com,
	dm-devel@...hat.com, akpm@...ux-foundation.org,
	david.s.gordon@...el.com, Tom Lendacky <thomas.lendacky@....com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	smueller@...onox.de, tadeusz.struk@...el.com,
	Masanari Iida <standby24x7@...il.com>, shli@...nel.org,
	Mark Brown <broonie@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-crypto@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: [PATCH 1/4] scatterlist: Introduce some helper functions

>>> + **/
>>> +static inline bool sg_is_contiguous(struct scatterlist *sga,
>>> +                                 struct scatterlist *sgb)
>>> +{
>>> +     return ((sga->page_link & ~0x3UL) + sga->offset + sga->length ==
>>> +             (sgb->page_link & ~0x3UL));
>>> +}
>> I don't understand that one.
>> sga->page_link is a pointer to a "struct page *". How can it be added to an
>> offset within a page ???
>
>
> Ah, sorry that's a mistake. It should check as below:
> static inline bool sg_is_contiguous(struct scatterlist *sga, struct
> scatterlist *sgb)
> {
>     return (unsigned int)sg_virt(sga) + sga->length == (unsigned
> int)sg_virt(sgb);
> }

sorry, it should be:
static inline bool sg_is_contiguous(struct scatterlist *sga,
   struct scatterlist *sgb)
{
    return (unsigned long)sg_virt(sga) + sga->length ==
               (unsigned long)sg_virt(sgb);
}

-- 
Baolin.wang
Best Regards

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