linux-kernel - Re: [PATCH] mm/cma: get nid from physical address

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Message-ID: <1d38aa26-cd2f-4330-9dcc-6c379cecb83b@huawei.com>
Date: Thu, 16 May 2024 18:03:44 +0800
From: Kefeng Wang <wangkefeng.wang@...wei.com>
To: Yajun Deng <yajun.deng@...ux.dev>, <akpm@...ux-foundation.org>
CC: <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/cma: get nid from physical address



On 2024/5/16 17:17, Yajun Deng wrote:
> The nid passed to cma_declare_contiguous_nid() may be NUMA_NO_NODE,
> which is not the actual nid. To get the correct nid, we can get the nid
> from physical address.
> 

Please check

https://lore.kernel.org/linux-riscv/47437c2b-5946-41c6-ad1b-cc03329eb230@huawei.com/

> Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
> ---
>   mm/cma.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/mm/cma.c b/mm/cma.c
> index 3e9724716bad..be6cdde32944 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -361,6 +361,7 @@ int __init cma_declare_contiguous_nid(phys_addr_t base,
>   		kmemleak_ignore_phys(addr);
>   		base = addr;
>   	}
> +	nid = early_pfn_to_nid(PHYS_PFN(base));
>   
>   	ret = cma_init_reserved_mem(base, size, order_per_bit, name, res_cma);
>   	if (ret)