linux-kernel - Re: [PATCH] pci-dma: Fix x86 dma_alloc_coherent to fully clear all pages returned

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Message-ID: <20150130223953.GK3552@two.firstfloor.org>
Date:	Fri, 30 Jan 2015 23:39:53 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Tim Chen <tim.c.chen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Akinobu Mita <akinobu.mita@...il.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH] pci-dma: Fix x86 dma_alloc_coherent to fully clear all
 pages returned

> We don't "need" any backward compatility, why not fix the broken drivers
> that are using memory outside of what they are asking for?  That's not
> ok no matter what, right?

How would you find them all?

We don't even know which place in XHCI is the culprit here.

Yes iff you can find them it would be good to fix.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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