linux-kernel - Re: [PATCH] scripts/kallsyms build warning fix

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Date:	Tue, 26 Jan 2010 10:43:41 +0530
From:	Himanshu Chauhan <hschauhan@...ltrace.org>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, greg@...ah.com
Subject: Re: [PATCH] scripts/kallsyms build warning fix

On Tue, Jan 26, 2010 at 11:02:34AM +0800, Américo Wang wrote:
> On Tue, Jan 26, 2010 at 5:41 AM, Himanshu Chauhan
> <hschauhan@...ltrace.org> wrote:
> > Hi all,
> >
> > This is a small patch that fixes the build warning
> > of scripts/kallsyms.c
> >
> > Regards
> > Himanshu
> >
> > Signed-off-by: Himanshu Chauhan <hschauhan@...ltrace.org>
> > ---
> >  scripts/kallsyms.c |    6 ++++--
> >  1 files changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
> > index 86c3896..e3902fb 100644
> > --- a/scripts/kallsyms.c
> > +++ b/scripts/kallsyms.c
> > @@ -108,8 +108,10 @@ static int read_symbol(FILE *in, struct sym_entry *s)
> >        rc = fscanf(in, "%llx %c %499s\n", &s->addr, &stype, str);
> >        if (rc != 3) {
> >                if (rc != EOF) {
> > -                       /* skip line */
> > -                       fgets(str, 500, in);
> > +                       /* skip line. sym is used as dummy to
> > +                        * shut of "warn_unused_result" warning.
> > +                        */
> > +                       sym = fgets(str, 500, in);
> >                }
> >                return -1;
> >        }
> 
> Why not use the return value to do some useful checking?

fgets is called as a part of error handling. Its called just to
drop a line and return immediately. read_map is reading the file
in a loop and read_symbol reads line by line. So I think there is
no point in using return value for useful checking. Other checks
like 3 items were returned or !EOF have already been done.

Regards
Himanshu
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