linux-kernel - Re: [NFS] [PATCH 002 of 9] knfsd: knfsd: Remove an unused variable from e

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Date:	Tue, 25 Jul 2006 14:36:13 +1000
From:	Neil Brown <neilb@...e.de>
To:	Greg Banks <gnb@...bourne.sgi.com>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux NFS Mailing List <nfs@...ts.sourceforge.net>,
	Josef Sipek <jsipek@....cs.sunysb.edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [NFS] [PATCH 002 of 9] knfsd: knfsd: Remove an unused
	variable	from e_show().

On Tuesday July 25, gnb@...bourne.sgi.com wrote:
> On Tue, 2006-07-25 at 14:20, Neil Brown wrote:
> > On Tuesday July 25, jsipek@....cs.sunysb.edu wrote:
> > > On Tue, Jul 25, 2006 at 11:54:32AM +1000, NeilBrown wrote:
> > > ...
> > 
> > Probably.  We just need a pointer value that is definitely not a
> > pointer to a valid cache_head object, and is not NULL.
> > (void*)1 seems a reasonable choice, but maybe #defineing something
> > would help.
> > 
> > Patches welcome.
> 
> This trivial patch compiles.

Cool... you learn something new every day!
> --
> 
> knfsd: Use SEQ_START_TOKEN instead of hardcoded magic (void*)1.
> 
> Signed-off-by: Greg Banks <gnb@...bourne.sgi.com>
Acked-by: NeilBrown <neilb@...e.de>

NeilBrown


> ---
> 
>  fs/nfsd/export.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> 
> Index: linux/fs/nfsd/export.c
> ===================================================================
> --- linux.orig/fs/nfsd/export.c	2006-07-25 14:28:03.000000000 +1000
> +++ linux/fs/nfsd/export.c	2006-07-25 14:29:14.526574385 +1000
> @@ -1086,7 +1086,7 @@ static void *e_start(struct seq_file *m,
>  	exp_readlock();
>  	read_lock(&svc_export_cache.hash_lock);
>  	if (!n--)
> -		return (void*)1;
> +		return SEQ_START_TOKEN;
>  	hash = n >> 32;
>  	export = n & ((1LL<<32) - 1);
>  
> @@ -1110,7 +1110,7 @@ static void *e_next(struct seq_file *m, 
>  	struct cache_head *ch = p;
>  	int hash = (*pos >> 32);
>  
> -	if (p == (void*)1)
> +	if (p == SEQ_START_TOKEN)
>  		hash = 0;
>  	else if (ch->next == NULL) {
>  		hash++;
> @@ -1180,7 +1180,7 @@ static int e_show(struct seq_file *m, vo
>  	struct svc_export *exp = container_of(cp, struct svc_export, h);
>  	svc_client *clp;
>  
> -	if (p == (void*)1) {
> +	if (p == SEQ_START_TOKEN) {
>  		seq_puts(m, "# Version 1.1\n");
>  		seq_puts(m, "# Path Client(Flags) # IPs\n");
>  		return 0;
> 
> 
> 
> Greg.
> -- 
> Greg Banks, R&D Software Engineer, SGI Australian Software Group.
> I don't speak for SGI.
> 
> 
> 
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