linux-kernel - Re: [PATCH 6/8] Use __kernel_ulong_t in x86 struct semid64

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Message-ID: <20140122145747.GC8065@arm.com>
Date:	Wed, 22 Jan 2014 14:57:47 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	"H.J. Lu" <hjl.tools@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/8] Use __kernel_ulong_t in x86 struct semid64_ds

On Tue, Jan 21, 2014 at 06:06:11PM +0000, H.J. Lu wrote:
> On Tue, Jan 21, 2014 at 9:10 AM, Catalin Marinas
> <catalin.marinas@....com> wrote:
> > On Fri, Dec 27, 2013 at 05:25:10PM +0000, H.J. Lu wrote:
> >> Both x32 and x86-64 use the same struct semid64_ds for system calls.
> >> But x32 long is 32-bit. This patch replaces unsigned long with
> >> __kernel_ulong_t in x86 struct semid64_ds.
> >>
> >> Signed-off-by: H.J. Lu <hjl.tools@...il.com>
> >> ---
> >>  arch/x86/include/uapi/asm/sembuf.h | 10 +++++-----
> >>  1 file changed, 5 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/arch/x86/include/uapi/asm/sembuf.h b/arch/x86/include/uapi/asm/sembuf.h
> >> index ee50c80..cc2d6a3 100644
> >> --- a/arch/x86/include/uapi/asm/sembuf.h
> >> +++ b/arch/x86/include/uapi/asm/sembuf.h
> >> @@ -13,12 +13,12 @@
> >>  struct semid64_ds {
> >>       struct ipc64_perm sem_perm;     /* permissions .. see ipc.h */
> >>       __kernel_time_t sem_otime;      /* last semop time */
> >> -     unsigned long   __unused1;
> >> +     __kernel_ulong_t __unused1;
> >>       __kernel_time_t sem_ctime;      /* last change time */
> >> -     unsigned long   __unused2;
> >> -     unsigned long   sem_nsems;      /* no. of semaphores in array */
> >> -     unsigned long   __unused3;
> >> -     unsigned long   __unused4;
> >> +     __kernel_ulong_t __unused2;
> >> +     __kernel_ulong_t sem_nsems;     /* no. of semaphores in array */
> >> +     __kernel_ulong_t __unused3;
> >> +     __kernel_ulong_t __unused4;
> >>  };
> >
> > Since you are at this, could you please change the
> > include/uapi/asm-generic/sembuf.h structure as well?
> 
> I could, but my build doesn't use that header file.  I prefer not to
> change something I can't test.

OK, it makes sense.

> I am enclosing a program to check kernel uabi header files
> against glibc header files.  You can try it on ILP32 ARM64.

Thanks, very useful. We'll give it a try when we get there. So far I
NAK'ed the first set of arm64 ILP32 patches as they were mostly using
the compat ABI (https://lkml.org/lkml/2013/9/9/502).

-- 
Catalin
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