linux-kernel - Re: [PATCH 09/33] aio: dprintk() -> pr

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Date:	Thu, 21 Mar 2013 10:38:32 -0700
From:	Joe Perches <joe@...ches.com>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-aio@...ck.org,
	akpm@...ux-foundation.org, Zach Brown <zab@...hat.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jens Axboe <axboe@...nel.dk>,
	Asai Thambi S P <asamymuthupa@...ron.com>,
	Selvan Mani <smani@...ron.com>,
	Sam Bradshaw <sbradshaw@...ron.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH 09/33] aio: dprintk() -> pr_debug()

On Thu, 2013-03-21 at 09:35 -0700, Kent Overstreet wrote:
[]
> diff --git a/fs/aio.c b/fs/aio.c

Hi Kent.

I generally prefer pr_debug but maybe here's
a couple of things you don't already know.

> +#define pr_fmt(fmt) "%s: " fmt, __func__

dynamic debug can add __func__ to each output
with +f so I think this prefixing with %s, __func__
is unnecessary.

I do think
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
is fairly standard, (though that can be added by
dynamic_debug as well with -m)

For example, without dynamic debug enabled
but with DEBUG #defined and KBUILD_MODNAME
I could get in dmesg:
	aio: ENOMEM: nr_events too high
instead of
	ioctx_alloc: ENOMEM: nr_events too high
and I think that's more intelligible.

These messages are not emitted by default, only
when specifically enabled with dynamic_debug or
adding #define DEBUG to the sources or -DDEBUG
to the Makefile


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