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Message-ID: <3f46eefa-6415-4d7a-af91-eef898d4f77a@redhat.com>
Date:   Tue, 17 Oct 2023 16:39:05 +0200
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User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH v6 1/3] mm/memory_hotplug: replace an open-coded kmemdup()
 in add_memory_resource()
Content-Language: en-US
To:     Vishal Verma <vishal.l.verma@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Oscar Salvador <osalvador@suse.de>,
        Dan Williams <dan.j.williams@intel.com>,
        Dave Jiang <dave.jiang@intel.com>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org,
        Huang Ying <ying.huang@intel.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
        Michal Hocko <mhocko@suse.com>,
        Jonathan Cameron <Jonathan.Cameron@Huawei.com>,
        Jeff Moyer <jmoyer@redhat.com>
References: <20231016-vv-kmem_memmap-v6-0-078f0d3c0371@intel.com>
 <20231016-vv-kmem_memmap-v6-1-078f0d3c0371@intel.com>
From:   David Hildenbrand <david@redhat.com>
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Organization: Red Hat
In-Reply-To: <20231016-vv-kmem_memmap-v6-1-078f0d3c0371@intel.com>
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Precedence: bulk

On 17.10.23 07:44, Vishal Verma wrote:
> A review of the memmap_on_memory modifications to add_memory_resource()
> revealed an instance of an open-coded kmemdup(). Replace it with
> kmemdup().
> 
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Oscar Salvador <osalvador@suse.de>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Reported-by: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
> ---
>   mm/memory_hotplug.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index f8d3e7427e32..6be7de9efa55 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1439,11 +1439,11 @@ int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
>   	if (mhp_flags & MHP_MEMMAP_ON_MEMORY) {
>   		if (mhp_supports_memmap_on_memory(size)) {
>   			mhp_altmap.free = memory_block_memmap_on_memory_pages();
> -			params.altmap = kmalloc(sizeof(struct vmem_altmap), GFP_KERNEL);
> +			params.altmap = kmemdup(&mhp_altmap,
> +						sizeof(struct vmem_altmap),
> +						GFP_KERNEL);
>   			if (!params.altmap)
>   				goto error;
> -
> -			memcpy(params.altmap, &mhp_altmap, sizeof(mhp_altmap));
>   		}
>   		/* fallback to not using altmap  */
>   	}
> 

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb