linux-kernel - Re: Unsigned widening casts of binary "not" operations..

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Message-ID: <5175D696.8060603@zytor.com>
Date:	Mon, 22 Apr 2013 17:32:22 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Miller <davem@...emloft.net>,
	"Theodore Ts'o" <tytso@....edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Network Development <netdev@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Unsigned widening casts of binary "not" operations..

On 04/22/2013 05:15 PM, Linus Torvalds wrote:
> 
> (It turns out that any use of "UINT_MAX" for a "long" value also results in
> this warning, because we define it as "~0ul", so there are other cases of
> spurious things where we *intentionally* drop the high bits).
> 

I'm responsible for this particular piece of drain bramage... we should
probably just open-code the correct types conditional on the sizes like
userspace does.

	-hpa


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