From: Ingo Molnar <mingo@elte.hu>
Date: Thu, 5 Feb 2009 12:45:43 +0000 (+0100)
Subject: printk: introduce printk_once()
X-Git-Tag: v2.6.30-rc1~208^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f036be96dd9ce442ffb9ab33e3c165f5178815c0;p=pandora-kernel.git

printk: introduce printk_once()

This pattern shows up frequently in the kernel:

  static int once = 1;
  ...

		if (once) {
			once = 0;
			printk(KERN_ERR "message\n");
		}
  ...

So add a printk_once() helper macro that reduces this to a single line
of:

		printk_once(KERN_ERR "message\n");

It works analogously to WARN_ONCE() & friends. (We use a macro not
an inline because vararg expansion in inlines looks awkward and the
macro is simple enough.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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