linux-kernel - Re: IO errors after "block: remove bio_get_nr

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Date:	Tue, 22 Dec 2015 09:06:07 +0500
From:	"Artem S. Tashkinov" <t.artem@...os.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ming Lei <tom.leiming@...il.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Christoph Hellwig <hch@....de>,
	Ming Lin <ming.l@....samsung.com>, Jens Axboe <axboe@...com>,
	"Artem S. Tashkinov" <t.artem@...lcity.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Tejun Heo <tj@...nel.org>, IDE-ML <linux-ide@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linus971@...il.com
Subject: Re: IO errors after "block: remove bio_get_nr_vecs()"

On 2015-12-21 10:23, Linus Torvalds wrote:
> On Sun, Dec 20, 2015 at 8:47 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> 
>> That said, we obviously need to figure out this current problem
>> regardless first..
> 
> ... although maybe it *would* be interesting to hear what happens if
> you just compile a 64-bit kernel instead?

Under x86-64 I cannot reproduce this problem. It seems like it's PAE 
specific (Kent Overstreet says he has reproduced it).

> 
> Do you still see the problem? Because if not, then we should look very
> specifically for some 32-bit PAE issue.
> 
> For example, maybe we use "unsigned long" somewhere where we should
> use "phys_addr_t". On x86-64, they obviously end up being the same. On
> normal non-PAE x86-32, they are also the same. But ..
> 
>                  Linus
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