Messages in this thread | | | Date | Thu, 17 May 2012 16:51:25 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 08/10] Use __kernel_ulong_t in struct msqid64_ds |
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On 05/17/2012 03:13 PM, H.J. Lu wrote: > From: "H.J. Lu" <hjl.tools@gmail.com> > > Replace unsigned long with __kernel_ulong_t in struct msqid64_ds for > user space. Don't change unsigned long when __BITS_PER_LONG != 64 > since __kernel_ulong_t == unsigned long in this case. > > Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
This patch and the one before it seems to have another problem: we currently define __BITS_PER_LONG as:
#ifdef __x86_64__ # define __BITS_PER_LONG 64 #else # define __BITS_PER_LONG 32 #endif
... which means __BITS_PER_LONG == 64 on x86-64. This seems wrong. The result would seem to be that the padding members around __kernel_time_t in struct shmid64_ds (not visible in patch 07/10 but existing in the same structure) work by accident (I also wonder how the heck they're currently supposed to work on bigendian architectures!!)
However, whereas struct shmid64_ds seems to work okay, this patch would now seem to be wrong.
The sane thing would seem to be to change __BITS_PER_LONG to 32 on x32 and fix the padding hacks in struct shmid64_ds; H.J., would you agree?
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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