linux-kernel - Re: [PATCH 08/10] Use __kernel_ulong_t in struct msqid64

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Message-ID: <CA+55aFxtejaM8ecOw8VYk74OaXfGY7=LO3JSyz3rdHEv2r9goQ@mail.gmail.com>
Date:	Thu, 17 May 2012 20:49:28 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H.J. Lu" <hjl.tools@...il.com>
Cc:	"H. Peter Anvin" <hpa@...nel.org>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, mingo@...nel.org, tglx@...utronix.de,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 08/10] Use __kernel_ulong_t in struct msqid64_ds

On Thu, May 17, 2012 at 8:39 PM, H.J. Lu <hjl.tools@...il.com> wrote:
>
> That will be wrong.   __BITS_PER_LONG defines # bits of long
> as seen by kernel.  We don't use it in user space.

Yes you do. Exactly in that structure that Peter points to. *Exactly*
because that structure uses "long" instead of some fixed size. Which
will be different in user mode than in kernel mode.

And if user mode doesn't use these headers at all, then we should stop
playing the insane games.

                     Linus
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