Joe Perches [off-list ref] wrote:

On Sat, 2011-08-27 at 09:28 -0400, Andy Walls wrote:

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On Wed, 2011-08-24 at 14:42 -0700, Joe Perches wrote:

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On Wed, 2011-08-24 at 06:34 -0400, Andy Walls wrote:

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On Sun, 2011-08-21 at 15:56 -0700, Joe Perches wrote:

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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

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driver: cx18-0, cx18-1, cx18-2, etc.  With a quick skim, I think

your

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change preserves the format of all output messages (except

removing

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periods).  Can you confirm this?

Here's the output diff of
strings built-in.o | grep "^<.>" | sort
new and old

[]

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Yuck.

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2. PLease don't add a pr_fmt() #define to exevry file.  Just put

one

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where all the other CX18_*() macros are defined.  Every file

picks those

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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

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to #include statements.  That sort of thing just ups maintenance

hours

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later.  That's not a good trade off for subjectively better log
messages.
Won't redifining the 'pr_fmt(fmt)' generate preprocessor warnings
anyway?

No.

Andy, I fully understand how this stuff works.
You apparently don't (yet).

Look at include/linux/printk.h

#ifndef pr_fmt
#define pr_fmt(fmt) fmt
#endif

A default empty define is used when one
is not specified before printk.h is
included.  kernel.h includes printk.h

v4l2_<level> uses the "name" of the video
device in its output.  That name may not
be the same name as the module.

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Hi Joe,

I don't need to fully understand it.

This is a happy to glad change with no functional nor performance benefit.  It adds unneeded lines of code to the driver and mangles some of the log messages.

I see no benefit from my perspective.

Regards,
Andy