linux-kernel - RE: Does slow_virt_to_phys() work with vmalloc() in the case of 32bit-PAE and 2MB page?

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Date:	Tue, 28 Oct 2014 08:50:34 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	"dave.hansen@...el.com" <dave.hansen@...el.com>,
	Rik van Riel <riel@...hat.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: RE: Does slow_virt_to_phys() work with vmalloc() in the case of
 32bit-PAE and 2MB page?

> -----Original Message-----
> From: owner-linux-mm@...ck.org [mailto:owner-linux-mm@...ck.org] On
> Behalf Of Dexuan Cui
> Sent: Tuesday, October 28, 2014 15:08 PM
> To: Dave Hansen; Rik van Riel; H. Peter Anvin
> Cc: linux-kernel@...r.kernel.org; linux-mm@...ck.org
> Subject: Does slow_virt_to_phys() work with vmalloc() in the case of 32bit-
> PAE and 2MB page?
> 
> Hi all,
> I suspect slow_virt_to_phys() may not work with vmalloc() in
> the 32-bit PAE case(when the pa > 4GB), probably due to 2MB page(?)
> 
> Is there any known issue with slow_virt_to_phys() + vmalloc() +
> 32-bit PAE + 2MB page?
> 
> From what I read the code of slow_virt_to_phys(), the variable 'psize' is
> assigned with a value but not used at all -- is this a bug?
After reading through the code, I think there is no issue here, though the
assignment of 'psize'  should be unnecessary, I think.
 
Thanks,
-- Dexuan

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