linux-kernel - Re: [PATCH] parisc: unbreak automounter support on 64-bit kernel with 32-bit userspace

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Date:	Fri, 1 Feb 2013 14:51:30 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Rolf Eike Beer <eike-kernel@...tec.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ian Kent <raven@...maw.net>,
	autofs@...r.kernel.org
Subject: Re: [PATCH] parisc: unbreak automounter support on 64-bit kernel with
 32-bit userspace

On 31 January 2013 22:10, Rolf Eike Beer <eike-kernel@...tec.de> wrote:
> H. Peter Anvin wrote:
>> On 01/31/2013 01:42 PM, James Bottomley wrote:
>> > On Thu, 2013-01-31 at 13:29 -0800, H. Peter Anvin wrote:
>> >> On 01/31/2013 12:26 PM, James Bottomley wrote:
>> >>> [adding autofs list and maintainer for their perusal and ack, although
>> >>> this is an obvious fix to me
>> >>>
>> >>> James]
>> >>
>> >> The #if list probably should be inverted, and only specific platforms
>> >> should have unsigned long...
>> >
>> > The whitelist is 64 bit only platforms, like ia64, isn't it?  So yes,
>> > they're far less numerous.
>>
>> Correct.  It is basically the 64-bit platforms without any 32-bit
>> userspace, like Alpha and IA64.
>
> Arm64?

It supports 32-bit user-space (CONFIG_COMPAT). But we missed this
#ifdef for arm64. I'm not familiar with the autofs subsystem but at a
first look it seems that autofs_wqt_t types are not shared with user
space as part of a structure. It can come as an argument for an ioctl
command but as long as we don't expect this type to hold data larger
than 32-bit it should be ok.

-- 
Catalin
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