linux-kernel - RE: [PATCH cciss: fix printk format warning

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Date:	Fri, 27 Oct 2006 08:11:46 -0500
From:	"Cameron, Steve" <Steve.Cameron@...com>
To:	"Randy Dunlap" <randy.dunlap@...cle.com>,
	"Roland Dreier" <rdreier@...co.com>
Cc:	"Andrew Morton" <akpm@...l.org>,
	"ISS StorageDev" <iss_storagedev@...com>,
	"lkml" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH cciss: fix printk format warning

> Roland Dreier wrote:
> >  > >  	if (*total_size != (__u32) 0)
> >  > 
> >  > Why is cciss_read_capacity casting *total_size to u32?
> > 
> > It's not -- it's actually casting 0 to __32 -- there's no cast on the
> > *total_size side of the comparison.  However that just makes the cast
> > look even fishier.
> > 
> >  - R.
> 
> OK, how about this one then?
> 
> 
> 	c->busaddr = (__u32) cmd_dma_handle;
> 
> where cmd_dma_handle is a dma_addr_t (u32 or u64)

The command register to which that value is written
is a 32 bit register.  Cast it or not, only 32 bits
will be used.  The DMA mask used to get that memory
should ensure it's 32 bit addressable.

> and then later:
>
>		pci_free_consistent(h->pdev, sizeof(CommandList_struct),
>				    c, (dma_addr_t) c->busaddr);




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