linux-kernel - Re: [PATCH] mm: use pgprot

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Message-ID: <f9e48ed2-0e90-1a2d-c62e-739c33c4cc53@arm.com>
Date:   Mon, 25 Apr 2022 15:59:02 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     liusongtang <liusongtang@...wei.com>, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        nixiaoming@...wei.com, young.liuyang@...wei.com, trivial@...nel.org
Subject: Re: [PATCH] mm: use pgprot_val to get value of pgprot

Should have added 'memory_hotplug' in the subject line. Otherwise
this does not specify where the change is (neither does the commit
message below).

mm/memory_hotplug: use pgprot_val to get value of pgprot

On 4/25/22 13:47, liusongtang wrote:
> pgprot.pgprot is a non-portable code, it should be replaced by
> portable macro pgprot_val.
> 
> Signed-off-by: liusongtang <liusongtang@...wei.com>
> ---
>  mm/memory_hotplug.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 416b38c..bf7d181 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -303,7 +303,7 @@ int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages,
>  	int err;
>  	struct vmem_altmap *altmap = params->altmap;
>  
> -	if (WARN_ON_ONCE(!params->pgprot.pgprot))
> +	if (WARN_ON_ONCE(!pgprot_val(params->pgprot)))
>  		return -EINVAL;
>  
>  	VM_BUG_ON(!mhp_range_allowed(PFN_PHYS(pfn), nr_pages * PAGE_SIZE, false));
Otherwise LGTM.

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>