linux-kernel - Re: [tip:x86/debug] x86: Combine printk()s in show_regs

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Message-ID: <20110218200528.GA4966@elte.hu>
Date:	Fri, 18 Feb 2011 21:05:28 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Joe Perches <joe@...ches.com>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	jbeulich@...ell.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/debug] x86: Combine printk()s in show_regs_common()


* Joe Perches <joe@...ches.com> wrote:

> On Fri, 2011-02-18 at 10:40 +0000, tip-bot for Jan Beulich wrote:
> > Commit-ID:  fd8fa4d3ddc4cc04ec8097e632b995d535c52beb
> > Gitweb:     http://git.kernel.org/tip/fd8fa4d3ddc4cc04ec8097e632b995d535c52beb
> > Author:     Jan Beulich <JBeulich@...ell.com>
> > AuthorDate: Thu, 17 Feb 2011 15:56:58 +0000
> > Committer:  Ingo Molnar <mingo@...e.hu>
> > CommitDate: Fri, 18 Feb 2011 08:52:30 +0100
> > 
> > x86: Combine printk()s in show_regs_common()
> > 
> > Printing a single character alone when there's an immediately
> > following printk() is pretty pointless (and wasteful).
> 
> Ingo, why did you choose to apply this patch instead of
> the alternative one I posted on the same thread?

Your version:

	/* Board Name is optional */
	board = dmi_get_system_info(DMI_BOARD_NAME);
	if (!board)
		board = "";

	printk(KERN_CONT "\n");

	printk(KERN_DEFAULT "Pid: %d, comm: %.20s %s %s %.*s %s %s%s%s\n",
	       current->pid, current->comm, print_tainted(),
	       init_utsname()->release,
	       (int)strcspn(init_utsname()->version, " "),
	       init_utsname()->version,
	       vendor, product,
	       strlen(board) ? "/" : "",
	       board);

The 'board' fiddling and the strlen(board) check complicates things unnecessarily 
and makes the code hard to read. Jan's version was at least simple.

Something like this:

	/* Board Name is optional */
	board = dmi_get_system_info(DMI_BOARD_NAME);

	printk(KERN_CONT "\n");

	printk(KERN_DEFAULT "Pid: %d, comm: %.20s %s %s %.*s %s %s %s %s\n",
	       current->pid, current->comm, print_tainted(),
	       init_utsname()->release,
	       (int)strcspn(init_utsname()->version, " "),
	       init_utsname()->version,
	       vendor, product, board ? : "");

Would be easier to read and gives similarly useful output.

Thanks,

	Ingo
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