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

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Message-ID: <20151222035944.GG20661@kmo-pixel>
Date:	Mon, 21 Dec 2015 18:59:44 -0900
From:	Kent Overstreet <kent.overstreet@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	"Artem S. Tashkinov" <t.artem@...os.com>,
	"Artem S. Tashkinov" <t.artem@...lcity.com>,
	Christoph Hellwig <hch@....de>,
	Ming Lin <ming.l@....samsung.com>, Jens Axboe <axboe@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Whitehouse <swhiteho@...hat.com>,
	IDE-ML <linux-ide@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ming Lei <tom.leiming@...il.com>
Subject: Re: IO errors after "block: remove bio_get_nr_vecs()"

On Mon, Dec 21, 2015 at 04:08:11PM -0500, Tejun Heo wrote:

reproduced it with 32 bit pae:

> 1. Exclude memory above 4G line with boot param "max_addr=4G".

doesn't work - max_addr=1G doesn't work either

> 2. Disable highmem with "highmem=0".

works!

> 3. Try booting 64bit kernel.

works

Ok, so maybe it actually is PAE specific... but like you noted the block layer
works entirely in terms of pages so...

The one idea I can think of is - maybe BIOVEC_PHYS_MERGEABLE() is broken in PAE
mode? I am unfamiliar with anything PAE though.

Where does the ahci code consume the sglist?
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