linux-kernel - Re: [PATCH] NFS: remove trailing semicolon in macro definition

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Date:   Sun, 29 Nov 2020 16:50:50 +0000
From:   Trond Myklebust <trondmy@...merspace.com>
To:     "bfields@...ldses.org" <bfields@...ldses.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "anna.schumaker@...app.com" <anna.schumaker@...app.com>,
        "trix@...hat.com" <trix@...hat.com>,
        "chuck.lever@...cle.com" <chuck.lever@...cle.com>
CC:     "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] NFS: remove trailing semicolon in macro definition

On Sun, 2020-11-29 at 16:42 +0000, Trond Myklebust wrote:
> Hi Tom,
> 
> On Fri, 2020-11-27 at 11:43 -0800, trix@...hat.com wrote:
> > From: Tom Rix <trix@...hat.com>
> > 
> > The macro use will already have a semicolon.
> > 
> > Signed-off-by: Tom Rix <trix@...hat.com>
> > ---
> >  net/sunrpc/auth_gss/gss_generic_token.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/net/sunrpc/auth_gss/gss_generic_token.c
> > b/net/sunrpc/auth_gss/gss_generic_token.c
> > index fe97f3106536..9ae22d797390 100644
> > --- a/net/sunrpc/auth_gss/gss_generic_token.c
> > +++ b/net/sunrpc/auth_gss/gss_generic_token.c
> > @@ -46,7 +46,7 @@
> >  /* TWRITE_STR from gssapiP_generic.h */
> >  #define TWRITE_STR(ptr, str, len) \
> >         memcpy((ptr), (char *) (str), (len)); \
> > -       (ptr) += (len);
> > +       (ptr) += (len)
> >  
> >  /* XXXX this code currently makes the assumption that a mech oid
> > will
> >     never be longer than 127 bytes.  This assumption is not
> > inherent
> > in
> 
> There is exactly 1 use of this macro in the code AFAICS. Can we
> please
> just get rid of it, and make the code trivially easier to read?
> 


BTW: To illustrate just how obfuscating this kind of macro can be, note
that the line you are changing above will be completely optimised away
in the 1 use case we're talking about. It is bumping a pointer value
that immediately gets discarded.

-- 
Trond Myklebust
Linux NFS client maintainer, Hammerspace
trond.myklebust@...merspace.com