Re: [RFC 01/15] slub: Create sysfs field /sys/slab/<cache>/ops

[Roman Gushchin <guro@fb.com>]

On Fri, Mar 08, 2019 at 03:14:12PM +1100, Tobin C. Harding wrote:
> Create an ops field in /sys/slab/*/ops to contain all the callback
> operations defined for a slab cache. This will be used to display
> the additional callbacks that will be defined soon to enable movable
> objects.
> 
> Display the existing ctor callback in the ops fields contents.
> 
> Co-developed-by: Christoph Lameter <cl@linux.com>
> Signed-off-by: Tobin C. Harding <tobin@kernel.org>

Hi Tobin!

> ---
>  mm/slub.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index dc777761b6b7..69164aa7cbbf 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -5009,13 +5009,18 @@ static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf,
>  }
>  SLAB_ATTR(cpu_partial);
>  
> -static ssize_t ctor_show(struct kmem_cache *s, char *buf)
> +static ssize_t ops_show(struct kmem_cache *s, char *buf)
>  {
> +	int x = 0;
> +
>  	if (!s->ctor)
>  		return 0;
        ^^^^^^^^^^^^^^^^^
You can drop this part, can't you?

Also, it's not clear (without looking into following patches) why do you
make this refactoring. So, please, add a note, or move this change into
the patch 3.

Thanks!