linux-kernel - Re: [PATCH 5/5] ISDN-Gigaset: Enclose two expressions for the sizeof operator by parentheses

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Message-ID: <20160927072536.GV13620@mwanda>
Date:   Tue, 27 Sep 2016 10:25:36 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        gigaset307x-common@...ts.sourceforge.net, netdev@...r.kernel.org,
        Karsten Keil <isdn@...ux-pingi.de>,
        Paul Bolle <pebolle@...cali.nl>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 5/5] ISDN-Gigaset: Enclose two expressions for the sizeof
 operator by parentheses

On Tue, Sep 27, 2016 at 10:08:37AM +0300, Dan Carpenter wrote:
> On Mon, Sep 26, 2016 at 08:38:14PM +0300, Sergei Shtylyov wrote:
> > >@@ -53,7 +53,7 @@ void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
> > > {
> > > 	unsigned char outbuf[80];
> > > 	unsigned char c;
> > >-	size_t space = sizeof outbuf - 1;
> > >+	size_t space = sizeof(outbuf - 1);
> > 
> >    What?! Does that compile?
> > 
> > [...]
> 
> It prints a Smatch warning.  Smatch ignores these if they happen inside
> a macro where you pass a pointer and it takes the sizeof() the argument.

Reading that again, I realize it's not clear.  Smatch ignores these any
time they happen in a macro whether they're valid or not.  (Many times
they are valid).

regards,
dan carpenter