linux-kernel - Re: [PATCH 0/8] Update kernel uabi header files for x32

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Date:	Wed, 22 Jan 2014 15:10:49 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"H.J. Lu" <hjl.tools@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Will Deacon <will.deacon@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 0/8] Update kernel uabi header files for x32

On Tue, Jan 21, 2014 at 09:06:59AM -0800, H. Peter Anvin wrote:
> On 12/27/2013 02:14 PM, H.J. Lu wrote:
> > X32 uses the same kernel system call interface as x86-64 for many
> > system calls.  However, "long" is 64-bit for x86-64 and is 32-bit for
> > x32.  Where long or unsigned long are used in struct types for such
> > system calls, they are wrong for x32.  __kernel_[u]long_t is [unsigned]
> > long for all ABIs other than x32.  I am submitting 8 patches to replace
> > long or unsigned long with __kernel_[u]long_t so that those struct types
> > can be used with x32 system calls.
> > 
> > H.J. Lu (8):
> >   Use __kernel_long_t in struct timex
> >   Use __kernel_long_t/__kernel_ulong_t in <linux/resource.h>
> >   Use __kernel_ulong_t in uapi struct ipc64_perm
> >   Use __kernel_long_t in struct msgbuf
> >   Use __kernel_ulong_t in struct msqid64_ds
> >   Use __kernel_ulong_t in x86 struct semid64_ds
> >   Use __kernel_ulong_t in shmid64_ds/shminfo64/shm_info
> >   Use __kernel_long_t in struct mq_attr
> > 
> 
> As Catalin indirectly pointed out, I had made a followup to the wrong
> version of the patchset (because I commented to Christoph's feedback.)
> This is threaded to the proper version (without unnecessary #if
> __BITS_PER_LONG.)

>From an arm64 ILP32 perspective (though still work in progress), the
patches look fine. We'll continue the trend with similar changes to
generic semid64_ds.

In case the series is not committed yet:

Acked-by: Catalin Marinas <catalin.marinas@....com>
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