linux-kernel - Re: coccinelle and bitmask arithmetic (was: Re: [patch] TTY: synclink, small cleanup in dtr

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Date:	Tue, 29 Jan 2013 10:03:57 -0800
From:	Joe Perches <joe@...ches.com>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	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 (was: Re: [patch] TTY:
 synclink, small cleanup in dtr_rts())

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;
> }
> 
> static int it8152_pci_platform_notify(struct device *dev)
> {
>         if (dev->bus == &pci_bus_type) {
>                 if (dev->dma_mask)
>                         *dev->dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
>                 dev->coherent_dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
>                 dmabounce_register_dev(dev, 2048, 4096, it8152_needs_bounce);
>         }
>         return 0;
> }


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