linux-kernel - Re: Is iommu_num

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Date:	Sun, 05 Aug 2012 16:49:56 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andreas Schwab <schwab@...ux-m68k.org>
Cc:	Joerg Roedel <joerg.roedel@....com>,
	Anton Blanchard <anton@....ibm.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org
Subject: Re: Is iommu_num_pages() broken ?

On Sun, 2012-08-05 at 08:39 +0200, Andreas Schwab wrote:
> addr & (io_page_size - 1) computes the offset into the page pointed to
> by addr.  Looks right to me.
> 
> addr & ~(io_page_size - 1) would round addr down to the start of the
> page.

Ah that's right, for some reason I'm so used to seeing ~ before such
constructs that my brain must have imagined it :-)

Sorry for the noise. Next time I'll have coffee first then re-check ...

Cheers,
Ben.

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