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

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Date:   Mon, 25 Apr 2022 21:48:52 +0800
From:   liusongtang <liusongtang@...wei.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Anshuman Khandual <anshuman.khandual@....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

OK, Shall I add "Suggested-by: Kefeng Wang <wangkefeng.wang@...wei.com>" 
to these patches?

On 2022/4/25 18:40, Kefeng Wang wrote:
>
> On 2022/4/25 18:29, Anshuman Khandual wrote:
>> 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
>
>
> $ git grep "pgprot\.pgprot"
> arch/ia64/mm/init.c:    if (WARN_ON_ONCE(params->pgprot.pgprot != 
> PAGE_KERNEL.pgprot))
> arch/s390/mm/init.c:    if (WARN_ON_ONCE(params->pgprot.pgprot != 
> PAGE_KERNEL.pgprot))
> arch/sh/mm/init.c:      if (WARN_ON_ONCE(params->pgprot.pgprot != 
> PAGE_KERNEL.pgprot))
> mm/memory_hotplug.c:    if (WARN_ON_ONCE(!params->pgprot.pgprot))
>
> You can change other's codes too.
>
>>
>> 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>
>>
>> .
> .