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

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Date:	Fri, 18 Feb 2011 12:19:46 -0800
From:	Joe Perches <joe@...ches.com>
To:	Ingo Molnar <mingo@...e.hu>
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()

On Fri, 2011-02-18 at 21:05 +0100, Ingo Molnar wrote:
> * Joe Perches <joe@...ches.com> wrote:
> > 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.

Perhaps you should look at the surrounding code.
It's uses the same style as I chose for "board".

void show_regs_common(void)
{
	const char *vendor, *product, *board;

	vendor = dmi_get_system_info(DMI_SYS_VENDOR);
	if (!vendor)
		vendor = "";
	product = dmi_get_system_info(DMI_PRODUCT_NAME);
	if (!product)
		product = "";
...

> 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.

It's a question of using identical output or
merely similar output.

cheers, Joe

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