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

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Message-ID: <alpine.DEB.2.10.1609261849580.3199@hadrien>
Date:   Mon, 26 Sep 2016 18:50:38 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:     Joe Perches <joe@...ches.com>,
        David Laight <David.Laight@...LAB.COM>,
        "gigaset307x-common@...ts.sourceforge.net" 
        <gigaset307x-common@...ts.sourceforge.net>,
        "netdev@...r.kernel.org" <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" <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 Mon, 26 Sep 2016, SF Markus Elfring 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);
> >
> >> wrong ...
> >> think that is 7 instead of 79.
> >
> >
> > Well, it's sizeof(pointer) so either 4 or 8, but still,
> > what Markus proposes here is _wrong_.
>
> You are right at this place.
>
>
> > Markus, do you know the script probably has a lower
> > style conversion defect introduction rate than you do
> > when doing these mechanical things.
>
> Would it be nice if the script "checkpatch.pl" could avoid to point
> such a false positive out anyhow?

checkpatch reports:

WARNING: sizeof outbuf should be sizeof(outbuf)
#56: FILE: drivers/isdn/gigaset/common.c:56:
+	size_t space = sizeof outbuf - 1;

There is nothing wrong with the report,

julia

>
>
> > Please use it to verify what you are doing before
> > submitting more defective patches.
>
> Do you expect a resend for this update step so that an other statement
> in the function "gigaset_initdriver" would eventually be adjusted?
>
> Regards,
> Markus
> --
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