linux-kernel - Re: [PATCH] mm/mempool: Add 'else' to split mutually exclusive case

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Message-Id: <20200824121840.4cd7eb3dce03e8e1473221b3@linux-foundation.org>
Date:   Mon, 24 Aug 2020 12:18:40 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/mempool: Add 'else' to split mutually exclusive case

On Mon, 24 Aug 2020 07:53:54 -0400 Miaohe Lin <linmiaohe@...wei.com> wrote:

> Add else to split mutually exclusive case and avoid some unnecessary check.
> 
> --- a/mm/mempool.c
> +++ b/mm/mempool.c
> @@ -60,9 +60,8 @@ static void check_element(mempool_t *pool, void *element)
>  	/* Mempools backed by slab allocator */
>  	if (pool->free == mempool_free_slab || pool->free == mempool_kfree)
>  		__check_element(pool, element, ksize(element));
> -
>  	/* Mempools backed by page allocator */
> -	if (pool->free == mempool_free_pages) {
> +	else if (pool->free == mempool_free_pages) {
>  		int order = (int)(long)pool->pool_data;
>  		void *addr = kmap_atomic((struct page *)element);
>  

It doesn't seem to change code generation (compiler is smart), but I
think it helps readability.