linux-kernel - Re: [PATCH 1/4] cxgb3: Use more common logging style

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Date:   Thu, 09 Feb 2017 14:39:43 -0800
From:   Joe Perches <joe@...ches.com>
To:     Steve Wise <swise@...ngridcomputing.com>
Cc:     'Doug Ledford' <dledford@...hat.com>,
        'Sean Hefty' <sean.hefty@...el.com>,
        'Hal Rosenstock' <hal.rosenstock@...il.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] cxgb3: Use more common logging style

On Thu, 2017-02-09 at 16:34 -0600, Steve Wise wrote:
> > Subject: [PATCH 1/4] cxgb3: Use more common logging style
[]
> > -#define MOD "iw_cxgb3: "
> > -#define PDBG(fmt, args...) pr_debug(MOD fmt, ## args)
> > +#ifdef pr_fmt
> > +#undef pr_fmt
> > +#endif
> 
> Is the ifdef/undef needed?  I see other modules just define pr_fmt() regardless.

Yes.

Because kernel.h may be included before this file,
kernel.h creates a define for pr_fmt, so this must
be undef'd before redefining it.

The other option, done in most files, is to add
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
before any #include