On 07-02-10 10:51 Joe Perches wrote:
> On Sat, 2007-02-10 at 07:02 +0100, Michael Buesch wrote:
> > On Saturday 10 February 2007 02:27, Daniel Drake wrote:
> > > Robert P.J. Day's recent commit ("getting rid of all casts of k[cmz]alloc()
> > > calls") introduced a sparse warning for zd1211rw, related to our type-checking
> > > of addresses.
> > > > zd_chip.c:116:15: warning: implicit cast to nocast type
> > > This patch readds the type cast, it is correct.
> > > Signed-off-by: Daniel Drake <dsd@xxxxxxxxxx>
> > > Index: linux/drivers/net/wireless/zd1211rw/zd_chip.c
> > > ===================================================================
> > > --- linux.orig/drivers/net/wireless/zd1211rw/zd_chip.c
> > > +++ linux/drivers/net/wireless/zd1211rw/zd_chip.c
> > > @@ -113,7 +113,7 @@ int zd_ioread32v_locked(struct zd_chip *
> > >
> > > /* Allocate a single memory block for values and addresses. */
> > > count16 = 2*count;
> > > - a16 = kmalloc(count16 * (sizeof(zd_addr_t) + sizeof(u16)),
> > > + a16 = (zd_addr_t *) kmalloc(count16 * (sizeof(zd_addr_t) + sizeof(u16)),
> > > GFP_NOFS);
>
> I think it better to remove this __nocast instead.
> This is the only use of __nocast outside of kmem in the kernel tree.
>
> Why not just remove __nocast and use u16 instead of zd_addr_t?
Using the __nocast type sparse catches errors, when address and
value arguments are used in the wrong order for calls of the
zd_ioread* and zd_iowrite* functions. I'm a lazy guy, I like tools
do the hard work for me.
> If not the removal of the __nocast, would it be better to have a
> void pointer there?
I don't think that an explicit cast requires the introduction of a
temporary variable.
--
Uli Kunitz
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