Re: [PATCH] drivers/hwmon: Use pr_fmt and pr_

Joe Perches
2010-10-20T17:28:24Z

On Wed, 2010-10-20 at 10:18 -0700, Guenter Roeck wrote:
> On Wed, Oct 20, 2010 at 12:54:20PM -0400, Joe Perches wrote:
> > On Wed, 2010-10-20 at 09:49 -0700, Guenter Roeck wrote:
> > > On Wed, Oct 20, 2010 at 11:59:23AM -0400,
> > > Joe Perches wrote:
> > > [ ... ]
> > > > Anyway, I'd like to sort it out eventually.
> > > > For now, I just add the #define pr_fmt, with
> > > > a long term goal of removing them all and using
> > > > a different mechanism to remove the duplicated
> > > > prefix string altogether from the formats and
> > > > save some text.
> > > I don't mind individual pr_fmt defines as long as they are used.
> > > However, that is not the case in many of the patches.
> > > Just adding a pr_fmt define to a file without using it doesn't make sense to me.
> > kernel.h has the equivalent of:
> > #define pr_<level>(fmt, arg...) printk(KERN_<level> pr_fmt(fmt), ##arg)
> >
> And no one minds that there are literally hundreds of equivalent defines
> for pr_fmt in the code, and even more conflicting ones ? Odd.
>
> Maybe the following in kernel.h would make more sense.
>
> #ifndef pr_fmt
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> #endif
>
> At least it would make more sense than littering source files with pr_fmt definitions.
> If that doesn't fly, I would prefer to stick with the existing default definition in kernel.h.

That would give you no prefix at all and make the
logging messages harder to distinguish.

> At least that would give people an incentive to fix the problem in kernel.h (or in some other
> central location) if they dislike the resulting missing module names.

I don't think it flies for another year or two.

$ grep -Prh --include=*.[ch] "define\s*pr_fmt" * | \
perl -p -e 's/[ \t]+/ /g' | \
sort | uniq -c | sort -rn
211 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
93 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
16 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
16 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
4 #define pr_fmt(fmt) "intc: " fmt
4 #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
3 #define pr_fmt(fmt) "%s: " fmt, __func__
3 #define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
2 #define pr_fmt(fmt) "gcov: " fmt
2 #define pr_fmt(fmt) fmt
2 #define pr_fmt(fmt) DRV_NAME ": " fmt
1 #define pr_fmt(fmt) "viod: " fmt
1 #define pr_fmt(fmt) "tboot: " fmt
1 #define pr_fmt(fmt) "(stll) :" fmt
1 #define pr_fmt(fmt) "(stk) :" fmt
1 #define pr_fmt(fmt) "(stc): " fmt
1 #define pr_fmt(fmt) "PMU: " fmt
1 #define pr_fmt(fmt) "pit: " fmt
1 #define pr_fmt(fmt) "phram: " fmt
1 #define pr_fmt(fmt) "PCI: " fmt
1 #define pr_fmt(fmt) "module %s: " fmt
1 #define pr_fmt(fmt) "mmiotrace: " fmt
1 #define pr_fmt(fmt) KBUILD_MODNAME " WATCHDOG: " fmt
1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt /* Append 'batman-adv: ' before
1 #define pr_fmt(fmt) KBUILD_MODNAME " " fmt
1 #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
1 #define pr_fmt(fmt) "isram: " fmt
1 #define pr_fmt(fmt) "hw perfevents: " fmt
1 #define pr_fmt(fmt) "hw-breakpoint: " fmt
1 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
1 #define pr_fmt(fmt) "cxgb: " fmt
1 #define pr_fmt(fmt) "cn_test: " fmt
1 #define pr_fmt(fmt) "clock: " fmt
1 #define pr_fmt(fmt) "acerhdf: " fmt