linux-kernel - Re: [PATCH] MM: kmemleak: Removed coding style warnings and added a NULL check

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Message-ID: <ZUtlwgDB1L2WVzfy@arm.com>
Date:   Wed, 8 Nov 2023 10:41:06 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Omkar Wagle <ov.wagle@...il.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MM: kmemleak: Removed coding style warnings and added a
 NULL check

On Tue, Nov 07, 2023 at 10:27:56PM -0800, Omkar Wagle wrote:
> @@ -406,10 +406,13 @@ static struct kmemleak_object *__lookup_object(unsigned long ptr, int alias,
>  	unsigned long untagged_ptr = (unsigned long)kasan_reset_tag((void *)ptr);
>  
>  	while (rb) {
> -		struct kmemleak_object *object;
> +		struct kmemleak_object *object = NULL;
>  		unsigned long untagged_objp;
>  
>  		object = rb_entry(rb, struct kmemleak_object, rb_node);
> +		if (!object)
> +			break;

No need for this. rb_entry() is a container_of() and we already check
that rb is not NULL.

> @@ -1027,7 +1030,7 @@ static void object_no_scan(unsigned long ptr)
>  void __ref kmemleak_alloc(const void *ptr, size_t size, int min_count,
>  			  gfp_t gfp)
>  {
> -	pr_debug("%s(0x%px, %zu, %d)\n", __func__, ptr, size, min_count);
> +	pr_debug("%s(0x%p, %zu, %d)\n", __func__, ptr, size, min_count);

That's for debugging, I'd rather keep the %px option. The same comment
applies to all the other pr_debug() changes in this file.

-- 
Catalin