linux-kernel - Re: [PATCH 7/9] mm: Calc the right pfn if page size is not 4K

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Message-ID: <931b1e5a-de85-f172-a834-1496bc45535e@huawei.com>
Date:   Tue, 29 Mar 2022 09:14:50 +0800
From:   mawupeng <mawupeng1@...wei.com>
To:     <david@...hat.com>, <akpm@...ux-foundation.org>,
        <catalin.marinas@....com>, <will@...nel.org>, <corbet@....net>
CC:     <ardb@...nel.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
        <bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        <hpa@...cr.com>, <dvhart@...radead.org>, <andy@...radead.org>,
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        <linux-efi@...r.kernel.org>, <linux-ia64@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH 7/9] mm: Calc the right pfn if page size is not 4K



在 2022/3/28 20:33, David Hildenbrand 写道:
> On 26.03.22 07:46, Wupeng Ma wrote:
>> From: Ma Wupeng <mawupeng1@...wei.com>
>>
>> Pervious 0x100000 is used to check the 4G limit in
> 
> s/Pervious/Previous/
> 
>> find_zone_movable_pfns_for_nodes(). This is right in x86 because
>> the page size can only be 4K. But 16K and 64K are available in
>> arm64. So replate it with SIZE_4G >> PAGE_SHIFT.
> 
> s/replate/replace/
> 
>>
>> Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
>> ---
>>   mm/page_alloc.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index 6e0b4596cde9..41fd987b5b93 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -7811,7 +7811,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
>>   
>>   			usable_startpfn = memblock_region_memory_base_pfn(r);
>>   
>> -			if (usable_startpfn < 0x100000) {
>> +			if (usable_startpfn < (SZ_4G >> PAGE_SHIFT)) {
> 
> PHYS_PFN(SZ_4G)
> 
> ?
> 
Thanks for reviewing, will be fixed in the next version.

Thanks.
>>   				mem_below_4gb_not_mirrored = true;
>>   				continue;
>>   			}
> 
>