linux-kernel - Re: [PATCH 00/12] scsi/NCR5380: fix debugging macros and #include structure

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Date:	Tue, 18 Mar 2014 13:55:12 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Finn Thain <fthain@...egraphics.com.au>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	scsi <linux-scsi@...r.kernel.org>, Sam Creasey <sammy@...my.net>,
	Russell King <linux@....linux.org.uk>,
	Michael Schmitz <schmitz@...ian.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Linux/m68k" <linux-m68k@...r.kernel.org>
Subject: Re: [PATCH 00/12] scsi/NCR5380: fix debugging macros and #include structure

On Tue, Mar 18, 2014 at 1:45 PM, Joe Perches <joe@...ches.com> wrote:
> NCR does use pr_debug for the dprintk call, but
> it also doesn't verify fmt/arg matching when not
> compiled in
>
> drivers/scsi/NCR5380.h-#if NDEBUG
> drivers/scsi/NCR5380.h:#define dprintk(flg, fmt, args...) \
> drivers/scsi/NCR5380.h- do { if ((NDEBUG) & (flg)) pr_debug(fmt, ## args); } while (0)
> []
> drivers/scsi/NCR5380.h-#else
> drivers/scsi/NCR5380.h:#define dprintk(flg, fmt, args...)     do {} while (0)
>
> It'd be nice to change the last do {} while (0)
> to something like:
>
> #define dprintk(flg, fmt, args...) \
> do { if (0) pr_debug(fmt, ## args); } while (0)
>
> so the compiler can always verify but not emit any
> actual code or format strings.
>
> Also, using macros with ... and __VA_ARGS__ is
> a bit more modern.
>
> #define dprintk(flg, fmt, ...) \
> do { if (0) pr_debug(fmt, ##__VA_ARGS__); } while (0)

Na, no_printk():

#define dprintk(flg, fmt, ...) no_printk(fmt, ##__VA_ARGS__)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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