linux-kernel - Re: [PATCH v2] mm/mempool: Add 'else' to split mutually exclusive case

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Date:   Fri, 25 Sep 2020 02:47:58 +0000
From:   linmiaohe <linmiaohe@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mm/mempool: Add 'else' to split mutually exclusive
 case

Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Thu, 24 Sep 2020 07:16:41 -0400 Miaohe Lin <linmiaohe@...wei.com> wrote:
>
>> Add else to split mutually exclusive case and avoid some unnecessary check.
>> It doesn't seem to change code generation (compiler is smart), but I 
>> think it helps readability.
>
> OK, I guess.  But the comments are now in the wrong place.
>

Many thanks for kindly reply and fix the wrong comments place.
Have a good day!

> --- a/mm/mempool.c~mm-mempool-add-else-to-split-mutually-exclusive-case-fix
> +++ a/mm/mempool.c
> @@ -60,8 +60,8 @@ static void check_element(mempool_t *poo
>  	/* 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 */
>  	} else if (pool->free == mempool_free_pages) {
> +		/* Mempools backed by page allocator */
>  		int order = (int)(long)pool->pool_data;
>  		void *addr = kmap_atomic((struct page *)element);
>  
> @@ -83,8 +83,8 @@ static void poison_element(mempool_t *po
>  	/* Mempools backed by slab allocator */
>  	if (pool->alloc == mempool_alloc_slab || pool->alloc == mempool_kmalloc) {
>  		__poison_element(element, ksize(element));
> -	/* Mempools backed by page allocator */
>  	} else if (pool->alloc == mempool_alloc_pages) {
> +		/* Mempools backed by page allocator */
>  		int order = (int)(long)pool->pool_data;
>  		void *addr = kmap_atomic((struct page *)element);
>  
> _
>
>