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Subject: Re: [PATCH 1/3] mm, slub: use pGp to print page flags
To:     Yafang Shao <laoar.shao@gmail.com>, david@redhat.com, cl@linux.com,
        penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com,
        akpm@linux-foundation.org, pmladek@suse.com, rostedt@goodmis.org,
        sergey.senozhatsky@gmail.com, andriy.shevchenko@linux.intel.com,
        linux@rasmusvillemoes.dk
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org
References: <20210128021947.22877-1-laoar.shao@gmail.com>
 <20210128021947.22877-2-laoar.shao@gmail.com>
From:   Vlastimil Babka <vbabka@suse.cz>
Message-ID: <1c64112b-ade8-682f-3963-b4040fffb52d@suse.cz>
Date:   Thu, 28 Jan 2021 11:23:25 +0100
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Precedence: bulk

On 1/28/21 3:19 AM, Yafang Shao wrote:
> As pGp has been already introduced in printk, we'd better use it to make
> the output human readable.
> 
> Before this change, the output is,
> [ 6155.716018] INFO: Slab 0x000000004027dd4f objects=33 used=3 fp=0x000000008cd1579c flags=0x17ffffc0010200
> 
> While after this change, the output is,
> [ 8846.517809] INFO: Slab 0x00000000f42a2c60 objects=33 used=3 fp=0x0000000060d32ca8 flags=0x17ffffc0010200(slab|head)
> 
> Reviewed-by: David Hildenbrand <david@redhat.com>
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>

Reviewed-by: Vlastimil Babka <vbabka@suse.cz>

> ---
>  mm/slub.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 69742ab9a21d..4b9ab267afbc 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -641,8 +641,9 @@ void print_tracking(struct kmem_cache *s, void *object)
>  
>  static void print_page_info(struct page *page)
>  {
> -	pr_err("INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n",
> -	       page, page->objects, page->inuse, page->freelist, page->flags);
> +	pr_err("INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=%#lx(%pGp)\n",
> +	       page, page->objects, page->inuse, page->freelist,
> +	       page->flags, &page->flags);
>  
>  }
>  
>