linux-kernel - Re: [PATCH] bitops: simplify generic bit finding functions

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Date:	Sun, 27 Apr 2008 21:36:38 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Harvey Harrison <harvey.harrison@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-sparse@...r.kernel.org
Subject: Re: [PATCH] bitops: simplify generic bit finding functions

On Sun, Apr 27, 2008 at 01:29:21PM -0700, Harvey Harrison wrote:

> Oh, I didn't realize, I only did this because sparse started spewing out
> lots of:
> include/linux/bitops.h:166:32: warning: shift too big (65536) for type unsigned long
> 
> due to shift by size there, and again on line 202...I just wanted something
> that sparse wouldn't warn about and was a little easier to understand to boot.

That's a sparse problem, really.  I wonder if we simply should introduce a
new node type: EXPR_WARN.  So that expand would generate those from things
like division by zero/overflow/bad shift *and* emitting an insn for those
would generate a stored warning.

Objections?
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