Re: [PATCH 1/2] mm, slub: use pGp to print page flags

[David Hildenbrand <david@redhat.com>]

On 15.01.21 07:13, 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)
> 
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
> ---
>  mm/slub.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index dc5b42e..901a45a 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);
>  
>  }
>  
> 

Sounds helpful to me.

"pr_err" combined with "INFO" looks a little weird - "Oh my, something
serious just happened!!!! - but, hey, just for your information ... " :)

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Thanks,

David / dhildenb