Re: [PATCH v2 4/5] mm/slab: Add __free() support for kvfree

[Greg Kroah-Hartman]

On Mon, Aug 14, 2023 at 12:43:32AM -0700, Dan Williams wrote:
> Allow for the declaration of variables that trigger kvfree() when they
> go out of scope.
> 
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
>  include/linux/slab.h |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 848c7c82ad5a..241025367943 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -746,6 +746,8 @@ static inline __alloc_size(1, 2) void *kvcalloc(size_t n, size_t size, gfp_t fla
>  extern void *kvrealloc(const void *p, size_t oldsize, size_t newsize, gfp_t flags)
>  		      __realloc_size(3);
>  extern void kvfree(const void *addr);
> +DEFINE_FREE(kvfree, void *, if (_T) kvfree(_T))

No need to check _T before calling this, right (as was also pointed out
earlier).

thanks,

greg k-h