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

[Dexuan Cui <decui@microsoft.com>]

> -----Original Message-----
> From: owner-linux-mm@kvack.org [mailto:owner-linux-mm@kvack.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@vger.kernel.org; linux-mm@kvack.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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