linux-kernel - Re: [PATCH 2/2] mm: hugetlb: fix the name of hugetlb CMA

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Message-ID: <20200603141342.GB559132@carbon.DHCP.thefacebook.com>
Date:   Wed, 3 Jun 2020 07:13:42 -0700
From:   Roman Gushchin <guro@...com>
To:     Barry Song <song.bao.hua@...ilicon.com>
CC:     <akpm@...ux-foundation.org>, <mike.kravetz@...cle.com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>
Subject: Re: [PATCH 2/2] mm: hugetlb: fix the name of hugetlb CMA

On Wed, Jun 03, 2020 at 08:40:25PM +1200, Barry Song wrote:
> once we enable CMA_DEBUGFS, we will get the below errors:
> directory 'cma-hugetlb' with parent 'cma' already present
> 
> only the first numa node will get a directory in debugfs.
> we should have different names for different CMA areas.
> 
> Cc: Roman Gushchin <guro@...com>
> Signed-off-by: Barry Song <song.bao.hua@...ilicon.com>

Acked-by: Roman Gushchin <guro@...com>

> ---
>  mm/hugetlb.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index bcabbe02192b..4ebc4edc3b40 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -5586,12 +5586,14 @@ void __init hugetlb_cma_reserve(int order)
>  	reserved = 0;
>  	for_each_node_state(nid, N_ONLINE) {
>  		int res;
> +		char name[20];
>  
>  		size = min(per_node, hugetlb_cma_size - reserved);
>  		size = round_up(size, PAGE_SIZE << order);
>  
> +		snprintf(name, 20, "hugetlb%d", nid);
>  		res = cma_declare_contiguous_nid(0, size, 0, PAGE_SIZE << order,
> -						 0, false, "hugetlb",
> +						 0, false, name,
>  						 &hugetlb_cma[nid], nid);
>  		if (res) {
>  			pr_warn("hugetlb_cma: reservation failed: err %d, node %d",
> -- 
> 2.23.0
> 
> 
>