linux-kernel - Re: [GIT PULL] block updates for 2.6.31-rc1

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Date:	Wed, 17 Jun 2009 18:49:15 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jens Axboe <jens.axboe@...cle.com>, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [GIT PULL] block updates for 2.6.31-rc1

>>>>> "Andrew" == Andrew Morton <akpm@...ux-foundation.org> writes:

Andrew> i386 allnoconfig:

Andrew> block/blk-settings.c: In function 'blk_set_default_limits':
Andrew> block/blk-settings.c:115: warning: large integer implicitly
Andrew> truncated to unsigned type

I sent Jens a fix earlier today.

Andrew> It doesn't look like it'll cause any runtime problems, but that
Andrew> just means we got lucky.

I didn't do a compile check on 32-bit, I admit that.  But the patch was
explicitly done in a way that wouldn't affect the existing I/O path.

Andrew> Or is the code just buggy?  What are the units of
Andrew> BLK_BOUNCE_HIGH, BLK_BOUNCE_ANY and BLK_BOUNCE_ISA?  Seems that
Andrew> they are physical addresses.  So why are we copying one of these
Andrew> onto a variable which records pfns?

BLK_BOUNCE_* is the DMA mask, yes.  It needs to be converted to pfns.
That's what I messed up when I ripped the call out of DM to put it in
the generic block layer function.

I'll defer to Jens wrt. the choice of -1ULL.

-- 
Martin K. Petersen	Oracle Linux Engineering
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