linux-kernel - Re: [PATCH v2 1/4] mm: kmemleak: add OBJECT_PHYS flag for objects allocated with physical address

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Message-ID: <Yp3rO4WpLzxLA6+7@arm.com>
Date:   Mon, 6 Jun 2022 12:55:39 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Patrick Wang <patrick.wang.shcn@...il.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, yee.lee@...iatek.com
Subject: Re: [PATCH v2 1/4] mm: kmemleak: add OBJECT_PHYS flag for objects
 allocated with physical address

On Fri, Jun 03, 2022 at 11:54:12AM +0800, Patrick Wang wrote:
> diff --git a/mm/kmemleak.c b/mm/kmemleak.c
> index a182f5ddaf68..1e9e0aa93ae5 100644
> --- a/mm/kmemleak.c
> +++ b/mm/kmemleak.c
> @@ -172,6 +172,8 @@ struct kmemleak_object {
>  #define OBJECT_NO_SCAN		(1 << 2)
>  /* flag set to fully scan the object when scan_area allocation failed */
>  #define OBJECT_FULL_SCAN	(1 << 3)
> +/* flag set for object allocated with physical address */
> +#define OBJECT_PHYS		(1 << 4)
>  
>  #define HEX_PREFIX		"    "
>  /* number of bytes to print per line; must be 16 or 32 */
> @@ -575,7 +577,8 @@ static int __save_stack_trace(unsigned long *trace)
>   * memory block and add it to the object_list and object_tree_root.
>   */
>  static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
> -					     int min_count, gfp_t gfp)
> +					     int min_count, gfp_t gfp,
> +					     bool is_phys)

The patch looks fine but I wonder whether we should have different
functions for is_phys true/false, we may end up fewer changes overall
since most places simply pass is_phys == false:

static struct kmemleak_object *__create_object(unsigned long ptr, size_t size,
					       int min_count, gfp_t gfp,
					       bool is_phys);

static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
					     int min_count, gfp_t gfp)
{
	return __create_object(ptr, size, min_count, gfp, false);
}

static struct kmemleak_object *create_object_phys(unsigned long ptr, size_t size,
						  int min_count, gfp_t gfp)
{
	return __create_object(ptr, size, min_count, gfp, true);
}

Same for the other patches that change a few more functions.

-- 
Catalin