linux-kernel - Re: [PATCH 00/28] nios2 Linux kernel port

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Message-ID: <5354D34B.4030607@mentor.com>
Date:	Mon, 21 Apr 2014 16:14:03 +0800
From:	Chung-Lin Tang <chunglin_tang@...tor.com>
To:	"H. Peter Anvin" <hpa@...or.com>, Ley Foon Tan <lftan@...era.com>,
	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>,
	Chung-Lin Tang <cltang@...ESOURCERY.COM>
Subject: Re: [PATCH 00/28] nios2 Linux kernel port

On 14/4/21 1:31 PM, H. Peter Anvin wrote:
> On 04/20/2014 10:23 PM, Ley Foon Tan wrote:
>> On Sat, Apr 19, 2014 at 11:30 PM, Arnd Bergmann <arnd@...db.de> wrote:
>>> On Friday 18 April 2014, H. Peter Anvin wrote:
>>>> Did the generic headers ever get updated to match Linus' guidance that
>>>> any new architecture ports should use a 64-bit time_t?
>>>
>>> No, unfortunately not. With my rule that every architecture that gets
>>> added needs to clean up asm-generic some more, to make it easier to add
>>> the next one, we should probably do for nios2.
>>>
>>>         Arnd
>>
>> Can you give me the documentation on this new guidance and point me
>> any architecture have implemented this?
>> Thanks.
>>
> 
> We implemented it in the x32 ABI for x86.  In generic code this is keyed
> by COMPAT_USE_64BIT_TIME, but in your case it isn't actually a matter of
> compat, so it should be easier.
> 
> See this thread including the discussion about time_t:
> 
> https://lkml.org/lkml/2011/8/26/415
> 
> 	-hpa


I'm not sure why we need CONFIG_USE_64BIT_TIME? We don't have any
32-on-64 problems.

My understanding of what Arnd meant, was to clean up
asm-generic/posix_types.h such that for example, time_t should be
defined as a 'long long' type, which should be 64-bit almost everywhere.
At least AFAIK, that should work for all current asm-generic users.

Thanks,
Chung-Lin

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