linux-kernel - Re: coccinelle and bitmask arithmetic

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Message-ID: <1359534563.32305.6.camel@joe-AO722>
Date:	Wed, 30 Jan 2013 00:29:23 -0800
From:	Joe Perches <joe@...ches.com>
To:	wharms@....de
Cc:	Julia Lawall <julia.lawall@...6.fr>,
	Russell King <linux@....linux.org.uk>,
	Mike Rapoport <mike@...pulab.co.il>, Valdis.Kletnieks@...edu,
	cocci@...teme.lip6.fr, Dan Carpenter <dan.carpenter@...cle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Paul Fulghum <paulkf@...rogate.com>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: coccinelle and bitmask arithmetic

On Wed, 2013-01-30 at 09:21 +0100, walter harms wrote:
> Am 29.01.2013 19:03, schrieb Joe Perches:
> > On Tue, 2013-01-29 at 18:49 +0100, Julia Lawall wrote:
> >> How about the following (from today's linux-next).  They appear to be
> >> trying to do the same calculation, once with + and once with |.
> > 
> > (cc'ing the original developer and Russell King)
> > 
> > Likely the it8152_pci_platform_notify uses should use +
> > 
> >> arch/arm/common/it8152.c
> >>
> >> int dma_set_coherent_mask(struct device *dev, u64 mask)
> >> {
> >>         if (mask >= PHYS_OFFSET + SZ_64M - 1)
> >>                 return 0;
> >>
> >>         return -EIO;
> >> }
> >>
> 
> Great hit Joe :)

Julia and the others in the coccinelle group are the ones
with the whizzy program.


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