linux-kernel - Re: [PATCH] make powerpc BUG_ON() OK with pointers and bitwise

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Message-ID: <18089.11934.607569.349144@cargo.ozlabs.ibm.com>
Date:	Fri, 27 Jul 2007 09:30:38 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Al Viro <viro@....linux.org.uk>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH] make powerpc BUG_ON() OK with pointers and bitwise

Al Viro writes:

> Since powerpc insists on printing the _value_ of condition

We don't _print_ the value of the condition, we give it to a
conditional-trap instruction which will trap if it is non-zero.

> and on casting it to long...  At least let's make it a force-cast.

The long cast is to make sure it's sign-extended to the full register
width.  Adding __force looks fine.

> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>

Acked-by: Paul Mackerras <paulus@...ba.org>
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