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

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Date:	Fri, 27 Oct 2006 08:07:18 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	"Cameron, Steve" <Steve.Cameron@...com>
Cc:	"Roland Dreier" <rdreier@...co.com>,
	"Andrew Morton" <akpm@...l.org>,
	"ISS StorageDev" <iss_storagedev@...com>,
	"lkml" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH cciss: fix printk format warning

On Fri, 27 Oct 2006 08:11:46 -0500 Cameron, Steve wrote:

> > 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.

Got it.  Thanks for replying.

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

---
~Randy
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