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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080427203638.GW5882@ZenIV.linux.org.uk>
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?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/