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Date: Sat, 27 Aug 2011 09:28:59 -0400 From: Andy Walls <awalls@...metrocast.net> To: Joe Perches <joe@...ches.com> Cc: Mauro Carvalho Chehab <mchehab@...radead.org>, ivtv-devel@...vdriver.org, linux-media@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 06/14] [media] cx18: Use current logging styles On Wed, 2011-08-24 at 14:42 -0700, Joe Perches wrote: > On Wed, 2011-08-24 at 06:34 -0400, Andy Walls wrote: > > On Sun, 2011-08-21 at 15:56 -0700, Joe Perches wrote: > > > Add pr_fmt. > > > Convert printks to pr_<level>. > > > Convert printks without KERN_<level> to appropriate pr_<level>. > > > Removed embedded prefixes when pr_fmt was added. > > > Use ##__VA_ARGS__ for variadic macros. > > > Coalesce format strings. > > 1. It is important to preserve the per-card prefixes emitted by the > > driver: cx18-0, cx18-1, cx18-2, etc. With a quick skim, I think your > > change preserves the format of all output messages (except removing > > periods). Can you confirm this? > > Here's the output diff of > strings built-in.o | grep "^<.>" | sort > new and old > $ diff -u0 cx18.old cx18.new > --- cx18.old 2011-08-24 13:18:41.000000000 -0700 > +++ cx18.new 2011-08-24 14:04:10.000000000 -0700 > @@ -1,2 +1,9 @@ > -<3>cx18-alsa cx is NULL > -<3>cx18-alsa: %s: struct v4l2_device * is NULL > +<3>cx18_alsa: cx is NULL > +<3>cx18_alsa: %s-alsa: %s: failed to create struct snd_cx18_card > +<3>cx18_alsa: %s-alsa: %s: snd_card_create() failed with err %d > +<3>cx18_alsa: %s-alsa: %s: snd_card_register() failed with err %d > +<3>cx18_alsa: %s-alsa: %s: snd_cx18_card_create() failed with err %d > +<3>cx18_alsa: %s-alsa: %s: snd_cx18_pcm_create() failed with err %d > +<3>cx18_alsa: %s-alsa: %s: snd_cx18_pcm_create() failed with err %d > +<3>cx18_alsa: %s-alsa: %s: struct snd_cx18_card * already exists > +<3>cx18_alsa: %s: struct v4l2_device * is NULL > @@ -17,7 +23,0 @@ > -<3>%s-alsa: %s: failed to create struct snd_cx18_card > -<3>%s-alsa: %s: snd_card_create() failed with err %d > -<3>%s-alsa: %s: snd_card_register() failed with err %d > -<3>%s-alsa: %s: snd_cx18_card_create() failed with err %d > -<3>%s-alsa: %s: snd_cx18_pcm_create() failed with err %d > -<3>%s-alsa: %s: snd_cx18_pcm_create() failed with err %d > -<3>%s-alsa: %s: struct snd_cx18_card * already exists Yuck. > @@ -62 +62 @@ > -<3>%s: Prefix your subject line with [UNKNOWN CX18 CARD]. > +<3>%s: Prefix your subject line with [UNKNOWN CX18 CARD] > @@ -80 +80 @@ > -<4>%s-alsa: %s: struct snd_cx18_card * is NULL > +<4>cx18_alsa: %s-alsa: %s: struct snd_cx18_card * is NULL Yuck. > @@ -82 +82 @@ > -<4>%s: Could not register GPIO reset controllersubdevice; proceeding anyway. > +<4>%s: Could not register GPIO reset controller subdevice; proceeding anyway. > @@ -85 +85 @@ > -<4>%s: MPEG Index stream cannot be claimed directly, but something tried. > +<4>%s: MPEG Index stream cannot be claimed directly, but something tried > @@ -99,12 +99,14 @@ > -<6>cx18-alsa: module loading... > -<6>cx18-alsa: module unload complete > -<6>cx18-alsa: module unloading... > -<6>cx18-alsa-pcm %s: Allocating vbuffer > -<6>cx18-alsa-pcm %s: cx18 alsa announce ptr=%p data=%p num_bytes=%zd > -<6>cx18-alsa-pcm %s: dma area was NULL - ignoring > -<6>cx18-alsa-pcm %s: freeing pcm capture region > -<6>cx18-alsa-pcm %s: runtime was NULL > -<6>cx18-alsa-pcm %s: %s called > -<6>cx18-alsa-pcm %s: %s: length was zero > -<6>cx18-alsa-pcm %s: stride is zero > -<6>cx18-alsa-pcm %s: substream was NULL > +<6>cx18_alsa: module loading... > +<6>cx18_alsa: module unload complete > +<6>cx18_alsa: module unloading... > +<6>cx18_alsa: %s: Allocating vbuffer > +<6>cx18_alsa: %s: created cx18 ALSA interface instance > +<6>cx18_alsa: %s: cx18 alsa announce ptr=%p data=%p num_bytes=%zd > +<6>cx18_alsa: %s: dma area was NULL - ignoring > +<6>cx18_alsa: %s: freeing pcm capture region > +<6>cx18_alsa: %s: PCM stream for card is disabled - skipping > +<6>cx18_alsa: %s: runtime was NULL > +<6>cx18_alsa: %s: %s called > +<6>cx18_alsa: %s: %s: length was zero > +<6>cx18_alsa: %s: stride is zero > +<6>cx18_alsa: %s: substream was NULL > @@ -172 +174 @@ > -<6>%s: info: dualwatch: change stereo flag from 0x%x to 0x%x. > +<6>%s: info: dualwatch: change stereo flag from 0x%x to 0x%x > @@ -188 +190 @@ > -<6>%s: info: Preparing for firmware halt. > +<6>%s: info: Preparing for firmware halt > @@ -206 +208 @@ > -<6>%s: info: Switching standard to %llx. > +<6>%s: info: Switching standard to %llx > @@ -236 +237,0 @@ > -<6>%s: %s: created cx18 ALSA interface instance > @@ -239 +239,0 @@ > -<6>%s: %s: PCM stream for card is disabled - skipping > > 2. PLease don't add a pr_fmt() #define to exevry file. Just put one > > where all the other CX18_*() macros are defined. Every file picks those > > up. > > It's not the first #include of every file. > printk.h has a default #define pr_fmt(fmt) fmt > Well then don't use "pr_fmt(fmt)" in cx18, if it overloads a define somewhere else in the kernel and has a dependency on its order relative to #include statements. That sort of thing just ups maintenance hours later. That's not a good trade off for subjectively better log messages. Won't redifining the 'pr_fmt(fmt)' generate preprocessor warnings anyway? NACK. Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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