linux-kernel - Re: [PATCH v3 09/15] mm/slab_common: cleanup kmalloc

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Date:   Thu, 28 Jul 2022 18:13:09 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Joe Perches <joe@...ches.com>,
        Vasily Averin <vasily.averin@...ux.dev>,
        Matthew WilCox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 09/15] mm/slab_common: cleanup kmalloc_large()

On 7/12/22 15:39, Hyeonggon Yoo wrote:
> Now that kmalloc_large() and kmalloc_large_node() do mostly same job,
> make kmalloc_large() wrapper of __kmalloc_large_node_notrace().
> 
> In the meantime, add missing flag fix code in
> __kmalloc_large_node_notrace().
> 
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/slab_common.c | 36 +++++++++++++-----------------------
>  1 file changed, 13 insertions(+), 23 deletions(-)
> 
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index dc872e0ef0fc..9c46e2f9589f 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -932,29 +932,6 @@ gfp_t kmalloc_fix_flags(gfp_t flags)
>   * directly to the page allocator. We use __GFP_COMP, because we will need to
>   * know the allocation order to free the pages properly in kfree.
>   */
> -void *kmalloc_large(size_t size, gfp_t flags)
> -{
> -	void *ret = NULL;
> -	struct page *page;
> -	unsigned int order = get_order(size);
> -
> -	if (unlikely(flags & GFP_SLAB_BUG_MASK))
> -		flags = kmalloc_fix_flags(flags);
> -
> -	flags |= __GFP_COMP;
> -	page = alloc_pages(flags, order);
> -	if (likely(page)) {
> -		ret = page_address(page);
> -		mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B,
> -				      PAGE_SIZE << order);
> -	}
> -	ret = kasan_kmalloc_large(ret, size, flags);
> -	/* As ret might get tagged, call kmemleak hook after KASAN. */
> -	kmemleak_alloc(ret, size, 1, flags);
> -	trace_kmalloc(_RET_IP_, ret, NULL, size, PAGE_SIZE << order, flags);
> -	return ret;
> -}
> -EXPORT_SYMBOL(kmalloc_large);
>  
>  static __always_inline
>  void *__kmalloc_large_node_notrace(size_t size, gfp_t flags, int node)
> @@ -963,6 +940,9 @@ void *__kmalloc_large_node_notrace(size_t size, gfp_t flags, int node)
>  	void *ptr = NULL;
>  	unsigned int order = get_order(size);
>  
> +	if (unlikely(flags & GFP_SLAB_BUG_MASK))
> +		flags = kmalloc_fix_flags(flags);
> +
>  	flags |= __GFP_COMP;
>  	page = alloc_pages_node(node, flags, order);
>  	if (page) {
> @@ -978,6 +958,16 @@ void *__kmalloc_large_node_notrace(size_t size, gfp_t flags, int node)
>  	return ptr;
>  }
>  
> +void *kmalloc_large(size_t size, gfp_t flags)
> +{
> +	void *ret = __kmalloc_large_node_notrace(size, flags, NUMA_NO_NODE);
> +
> +	trace_kmalloc(_RET_IP_, ret, NULL, size,
> +		      PAGE_SIZE << get_order(size), flags);
> +	return ret;
> +}
> +EXPORT_SYMBOL(kmalloc_large);
> +
>  void *kmalloc_large_node_notrace(size_t size, gfp_t flags, int node)
>  {
>  	return __kmalloc_large_node_notrace(size, flags, node);