linux-kernel - Re: [PATCH] net/sunrpc/svc.c: fix sparse warning

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Date:	Mon, 11 May 2009 19:05:41 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	H Hartley Sweeten <hartleys@...ionengravers.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/sunrpc/svc.c: fix sparse warning

On Thu, Apr 16, 2009 at 03:15:17PM -0400, H Hartley Sweeten wrote:
> On Thursday, April 16, 2009 12:06 PM, J. Bruce Fields wrote:
> > On Wed, Apr 15, 2009 at 03:46:13PM -0400, H Hartley Sweeten wrote:
> >> Fix sparse warning in net/sunrpc/svc.c.
> >> 
> >> 	warning: symbol 'node' shadows an earlier one
> >
> > What's the other symbol?
> 
> Sorry. Left that out...
> 
> include/linux/nodemask.h
> 
> #define any_online_node(mask)			\
> ({						\
> 	int node;				\
> 	for_each_node_mask(node, (mask))	\
> 		if (node_online(node))		\
> 			break;			\
> 	node;					\
> })
> 
> arch/powerpc/mm/numa.c is the only other user of that macro. In that
> file the local variable is called nid, hence the name change in this
> patch.

Stupid question (and sorry for the delay): any reason that macro
couldn't just be a static inline function?

I'm sort of resistant to the idea that the caller should have to care
what local variable names the implementation uses.

--b.

> 
> Regards,
> Hartley
> 
> >> 
> >> Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
> >> 
> >> ---
> >> 
> >> diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> >> index 8847add..e781135 100644
> >> --- a/net/sunrpc/svc.c
> >> +++ b/net/sunrpc/svc.c
> >> @@ -122,7 +122,7 @@ module_param_call(pool_mode, param_set_pool_mode,
> >> param_get_pool_mode,
> >>  static int
> >>  svc_pool_map_choose_mode(void)
> >>  {
> >> -	unsigned int node;
> >> +	unsigned int nid;
> >>  
> >>  	if (num_online_nodes() > 1) {
> >>  		/*
> >> @@ -132,8 +132,8 @@ svc_pool_map_choose_mode(void)
> >>  		return SVC_POOL_PERNODE;
> >>  	}
> >>  
> >> -	node = any_online_node(node_online_map);
> >> -	if (nr_cpus_node(node) > 2) {
> >> +	nid = any_online_node(node_online_map);
> >> +	if (nr_cpus_node(nid) > 2) {
> >>  		/*
> >>  		 * Non-trivial SMP, or CONFIG_NUMA on
> >>  		 * non-NUMA hardware, e.g. with a generic 
--
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