From: "H. Peter Anvin" <hpa@zytor.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org, Vineet.Gupta1@synopsys.com,
linux-kernel@vger.kernel.org,
James Hogan <james.hogan@imgtec.com>
Subject: Re: new architectures, time_t __kernel_long_t
Date: Thu, 20 Dec 2012 21:05:30 -0800 [thread overview]
Message-ID: <50D3EE1A.7020703@zytor.com> (raw)
In-Reply-To: <20121221050202.GP4939@ZenIV.linux.org.uk>
On 12/20/2012 09:02 PM, Al Viro wrote:
> On Thu, Dec 20, 2012 at 09:00:27PM -0800, H. Peter Anvin wrote:
>> On 12/20/2012 08:57 PM, Al Viro wrote:
>>> On Wed, Nov 14, 2012 at 12:18:01PM +0000, Arnd Bergmann wrote:
>>>
>>>> The other types that are used as 64 bit on x32 are ino_t, nlink_t,
>>>> size_t, ssize_t, ptrdiff_t, and off_t.
>>>
>>> *Kernel-side* we should not give a damn about the userland nlink_t, period.
>>> Making it architecture-dependent had been a bad mistake that essentially
>>> made nlink_t useless for the kernel. That mistake had been fixed; please,
>>> do not bring it back. If some userland structure needs to include a field
>>> encoding nlink_t values, please use an explicitly-sized type when refering
>>> to it kernel-side.
>>>
>>
>> We should never use userland types per se. We can use __kernel_*_t
>> typedefs to make the kernel headers neater if it makes sense, but that
>> is often not even necessary.
>
> ... as long as we do not have typedef __kernel_foo_t foo_t in linux/types.h.
>
In the case of things like nlink_t and dev_t I would suggest we
explicitly call out the types as kernel and user. I would suggest
knlink_t and unlink_t but the latter made me want to stab my eyes out
due to its confusion potential, so I wonder if we should establish a new
convention with _kt (kernel type) and _ut (user type) suffixes, so
nlink_kt and nlink_ut, alternatively one could consider k_nlink_t and
u_nlink_t.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2012-12-21 5:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-14 12:18 new architectures, time_t __kernel_long_t Arnd Bergmann
2012-11-14 12:48 ` Geert Uytterhoeven
2012-11-14 16:26 ` H. Peter Anvin
2012-11-15 9:14 ` Arnd Bergmann
2012-11-15 13:59 ` H.J. Lu
2012-11-15 14:36 ` Arnd Bergmann
2012-11-15 14:42 ` H.J. Lu
2012-11-15 15:10 ` H. Peter Anvin
2012-12-21 4:57 ` Al Viro
2012-12-21 5:00 ` H. Peter Anvin
2012-12-21 5:02 ` Al Viro
2012-12-21 5:05 ` H. Peter Anvin [this message]
2012-12-21 5:19 ` Al Viro
2012-12-21 5:47 ` H. Peter Anvin
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