linux-kernel - Re: [PATCH v2] mm/sparse: use MEMBLOCK_ALLOC

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Date: Tue, 11 Jun 2024 10:56:25 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Leesoo Ahn <lsahn@...eel.net>
Cc: Leesoo Ahn <lsahn@...akecorp.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/sparse: use MEMBLOCK_ALLOC_ACCESSIBLE enum instead
 of 0

On Tue, Jun 11, 2024 at 12:15:28AM +0900, Leesoo Ahn wrote:
> Setting 'limit' variable to 0 might seem like it means "no limit". But
> in the memblock API, 0 actually means the 'MEMBLOCK_ALLOC_ACCESSIBLE'
> enum, which limits the physical address range end based on
> 'memblock.current_limit'. This could be confusing.
> 
> Use the enum instead of 0 to make it clear.
> 
> Signed-off-by: Leesoo Ahn <lsahn@...eel.net>

Acked-by: Mike Rapoport (IBM) <rppt@...nel.org>

> ---
> v1 -> v2: do not rename 'limit' to 'limit_or_flag'
> ---
>  mm/sparse.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/sparse.c b/mm/sparse.c
> index de40b2c73406..cf93abc542ca 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -351,7 +351,7 @@ sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
>  again:
>  	usage = memblock_alloc_try_nid(size, SMP_CACHE_BYTES, goal, limit, nid);
>  	if (!usage && limit) {
> -		limit = 0;
> +		limit = MEMBLOCK_ALLOC_ACCESSIBLE;
>  		goto again;
>  	}
>  	return usage;
> -- 
> 2.34.1
> 

-- 
Sincerely yours,
Mike.