linux-kernel - Re: [PATCH v3] mm: hugetlb: optionally allocate gigantic hugepages using cma

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Date:   Thu, 12 Mar 2020 09:33:20 -0400
From:   Qian Cai <cai@....pw>
To:     Roman Gushchin <guro@...com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        kernel-team@...com, linux-kernel@...r.kernel.org,
        Rik van Riel <riel@...riel.com>,
        Andreas Schaufler <andreas.schaufler@....de>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH v3] mm: hugetlb: optionally allocate gigantic hugepages
 using cma

On Wed, 2020-03-11 at 15:09 -0700, Roman Gushchin wrote:
> +#ifdef CONFIG_CMA
> +static unsigned long hugetlb_cma_size __initdata;
> +
> +static int __init cmdline_parse_hugetlb_cma(char *p)
> +{
> +	unsigned long long val;
> +	char *endptr;
> +
> +	if (!p)
> +		return -EINVAL;
> +
> +	val = simple_strtoull(p, &endptr, 0);
> +	hugetlb_cma_size = memparse(p, &p);
> +	return 0;
> +}
> +

Here will generate a compilation warning,

mm/hugetlb.c: In function 'cmdline_parse_hugetlb_cma':
mm/hugetlb.c:5548:21: warning: variable 'val' set but not used [-Wunused-but-
set-variable]
  unsigned long long val;
                     ^~~
Also, the comments for simple_strtoull() in lib/vsprintf.c said,

"This function is obsolete. Please use kstrtoull instead."