linux-kernel - Re: USB transfer_buffer allocations on 64bit systems

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Message-ID: <Pine.LNX.4.44L0.1004071245410.1779-100000@iolanthe.rowland.org>
Date:	Wed, 7 Apr 2010 12:47:09 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Daniel Mack <daniel@...aq.de>
cc:	Greg KH <greg@...ah.com>, <linux-kernel@...r.kernel.org>,
	Pedro Ribeiro <pedrib@...il.com>, <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, <alsa-devel@...a-project.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: USB transfer_buffer allocations on 64bit systems

On Wed, 7 Apr 2010, Daniel Mack wrote:

> Ok, I'll write some dummies for usb_malloc() and usb_zalloc() which
> will just call kmalloc() with GFP_DMA32 for now. And while at it,
> usb_alloc_buffer() will be renamed to usb_alloc_consistent(). Then I'll
> try to clean up all existing drivers to use this new interface and
> follow the changes.
> 
> In a next step, we should fine-tune when GFP_DMA32 is really needed.
> And I'll leave all occurances of usb_alloc_consistent() as they are now.
> 
> Does that sound ok?

Yes, that should work out well.

Alan Stern

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