linux-kernel - Re: [PATCH] mm: Fix printk format strings

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Message-Id: <20071010235306.c71afe66.akpm@linux-foundation.org>
Date:	Wed, 10 Oct 2007 23:53:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Hugh Dickins <hugh@...itas.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Fix printk format strings

On Thu, 11 Oct 2007 08:47:01 +0200 Vegard Nossum <vegard.nossum@...il.com> wrote:

> This makes sure printk format strings contain no more than a single
> line.
> 
> Signed-off-by: Vegard Nossum <vegard.nossum@...il.com>
> ---
>  mm/page_alloc.c |   20 +++++++++++---------
>  1 files changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 1a8c595..96f0b33 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -198,13 +198,15 @@ static inline int bad_range(struct zone *zone, struct page *page)
>  
>  static void bad_page(struct page *page)
>  {
> -	printk(KERN_EMERG "Bad page state in process '%s'\n"
> -		KERN_EMERG "page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n"
> -		KERN_EMERG "Trying to fix it up, but a reboot is needed\n"
> -		KERN_EMERG "Backtrace:\n",
> -		current->comm, page, (int)(2*sizeof(unsigned long)),
> -		(unsigned long)page->flags, page->mapping,
> +	printk(KERN_EMERG "Bad page state in process '%s'\n", current->comm);
> +	printk(KERN_EMERG
> +		"page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n",
> +		page, (int) (2 * sizeof(unsigned long)),
> +		(unsigned long) page->flags, page->mapping,
>  		page_mapcount(page), page_count(page));
> +	printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n");
> +	printk(KERN_EMERG "Backtrace:\n");
> +
>  	dump_stack();
>  	page->flags &= ~(1 << PG_lru	|
>  			1 << PG_private |
> @@ -1575,13 +1577,13 @@ void show_free_areas(void)
>  		}
>  	}
>  
> -	printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu unstable:%lu\n"
> -		" free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
> +	printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu unstable:%lu\n",
>  		global_page_state(NR_ACTIVE),
>  		global_page_state(NR_INACTIVE),
>  		global_page_state(NR_FILE_DIRTY),
>  		global_page_state(NR_WRITEBACK),
> -		global_page_state(NR_UNSTABLE_NFS),
> +		global_page_state(NR_UNSTABLE_NFS));
> +	printk(" free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
>  		global_page_state(NR_FREE_PAGES),
>  		global_page_state(NR_SLAB_RECLAIMABLE) +
>  			global_page_state(NR_SLAB_UNRECLAIMABLE),

I don't understand the reason for this change.

-
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