linux-kernel - Re: new architectures, time_t __kernel_long

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Message-ID: <20121221050202.GP4939@ZenIV.linux.org.uk>
Date:	Fri, 21 Dec 2012 05:02:02 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	Vineet.Gupta1@...opsys.com, linux-kernel@...r.kernel.org,
	James Hogan <james.hogan@...tec.com>
Subject: Re: new architectures, time_t __kernel_long_t

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.
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