linux-kernel - Re: [PATCH][next] nfsd: remove redundant assignments to variable len

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Date:   Wed, 21 Jun 2023 15:16:59 +0000
From:   Chuck Lever III <chuck.lever@...cle.com>
To:     Colin Ian King <colin.i.king@...il.com>
CC:     Jeff Layton <jlayton@...nel.org>, Neil Brown <neilb@...e.de>,
        Olga Kornievskaia <kolga@...app.com>,
        Dai Ngo <dai.ngo@...cle.com>, Tom Talpey <tom@...pey.com>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] nfsd: remove redundant assignments to variable len



> On Jun 21, 2023, at 10:52 AM, Colin Ian King <colin.i.king@...il.com> wrote:
> 
> There are a few assignments to variable len where the value is not
> being read and so the assignments are redundant and can be removed.
> In one case, the variable len can be removed completely. Cleans up
> 4 clang scan warnings of the form:
> 
> fs/nfsd/export.c:100:7: warning: Although the value stored to 'len'
> is used in the enclosing expression, the value is never actually
> read from 'len' [deadcode.DeadStores]
> 
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> ---
> fs/nfsd/export.c | 12 +++++-------
> 1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
> index ae85257b4238..11a0eaa2f914 100644
> --- a/fs/nfsd/export.c
> +++ b/fs/nfsd/export.c
> @@ -97,7 +97,7 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
> goto out;
> 
> err = -EINVAL;
> - if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
> + if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
> goto out;
> 
> err = -ENOENT;
> @@ -107,7 +107,7 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
> dprintk("found domain %s\n", buf);
> 
> err = -EINVAL;
> - if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
> + if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
> goto out;
> fsidtype = simple_strtoul(buf, &ep, 10);
> if (*ep)
> @@ -593,7 +593,6 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
> {
> /* client path expiry [flags anonuid anongid fsid] */
> char *buf;
> - int len;
> int err;
> struct auth_domain *dom = NULL;
> struct svc_export exp = {}, *expp;
> @@ -609,8 +608,7 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
> 
> /* client */
> err = -EINVAL;
> - len = qword_get(&mesg, buf, PAGE_SIZE);
> - if (len <= 0)
> + if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
> goto out;
> 
> err = -ENOENT;
> @@ -620,7 +618,7 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
> 
> /* path */
> err = -EINVAL;
> - if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
> + if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
> goto out1;
> 
> err = kern_path(buf, 0, &exp.ex_path);
> @@ -665,7 +663,7 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
> goto out3;
> exp.ex_fsid = an_int;
> 
> - while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
> + while (qword_get(&mesg, buf, PAGE_SIZE) > 0) {
> if (strcmp(buf, "fsloc") == 0)
> err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
> else if (strcmp(buf, "uuid") == 0)
> -- 
> 2.39.2

Thanks, applied to nfsd-next.


--
Chuck Lever