linux-kernel - Re: [PATCH] usb: storage: Add usb_stor

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Date:	Thu, 18 Apr 2013 09:11:44 -0700
From:	Joe Perches <joe@...ches.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kay Sievers <kay.sievers@...y.org>,
	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: storage: Add usb_stor_dbg, reduce object size

On Thu, 2013-04-18 at 10:57 -0400, Alan Stern wrote:
> On Wed, 17 Apr 2013, Joe Perches wrote:
> 
> > On Wed, 2013-04-17 at 14:47 -0400, Alan Stern wrote:
> > > On Wed, 17 Apr 2013, Joe Perches wrote:
> > []
> > > > +int usb_stor_dbg(const struct us_data *us, const char *fmt, ...)
> > > > +{
> > > > +     struct va_format vaf;
> > > > +     va_list args;
> > > > +     int r;
> > > > +
> > > > +     va_start(args, fmt);
> > > > +
> > > > +     if (us && us->pusb_dev) {
> > > > +             r = dev_vprintk_emit(7, &us->pusb_dev->dev, fmt, args);
> > > 
> > > Isn't there a symbolic constant you can use instead of "7"?
> > 
> > Nope.
> > lib/dynamic_debug:__dynamic_dev_dbg() does the same thing.
> 
> This clearly is an omission in the logging API.
> 
> Kay, why doesn't the kernel have symbolic constants for the various
> logging facilities and levels?

Because they're so _very_ rarely used in decimal form.

printk.c, drivers/base/core.c, and net/core/dev.c
sensibly use - '0', and I think dynamic_debug is the
only other current user.

I suppose a new inline could be created something like

static inline int printk_get_level_decimal(const char *level)
{
	if (printk_get_level(level)) {
		switch (level[1]) {
			case '0' ... '7':
				return level[1] - '0';
		}
	}

	return -1;
}


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