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Fri, 21 Mar 2025 22:18:28 -0700 (PDT) X-Google-Smtp-Source: AGHT+IE2YCyfrlPP3G8pShfgvgE8JMpszQjESi2Jtv/ETNYhFB8iJC5kL2lA56pxfuvgdT3ujjkBCA== X-Received: by 2002:a05:600c:1f8b:b0:43c:f1b8:16ad with SMTP id 5b1f17b1804b1-43d50a4a938mr58606995e9.30.1742620708003; Fri, 21 Mar 2025 22:18:28 -0700 (PDT) Received: from [10.239.241.125] ([88.128.92.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43d440ed4cbsm98232765e9.34.2025.03.21.22.18.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Mar 2025 22:18:27 -0700 (PDT) Message-ID: Date: Sat, 22 Mar 2025 06:18:26 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: mm: Correct the update of max_pfn To: Zhenhua Huang , anshuman.khandual@arm.com, catalin.marinas@arm.com, will@kernel.org, ryan.roberts@arm.com, mark.rutland@arm.com, ardb@kernel.org, yangyicong@hisilicon.com, joey.gouly@arm.com, quic_cgoldswo@quicinc.com, quic_sudaraja@quicinc.com, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, quic_tingweiz@quicinc.com References: <20250321070019.1271859-1-quic_zhenhuah@quicinc.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Stat-Signature: byo6td8u9rigasbc1d3yxamxznz61csp X-Rspam-User: X-Rspamd-Queue-Id: 7CEB240004 X-HE-Tag: 1742620713-871616 X-HE-Meta: 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 BIMXUG9n 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 21.03.25 08:00, Zhenhua Huang wrote: > Hotplugged memory can be smaller than the original memory. For example, > on my target: > > root@genericarmv8:~# cat /sys/kernel/debug/memblock/memory > 0: 0x0000000064005000..0x0000000064023fff 0 NOMAP > 1: 0x0000000064400000..0x00000000647fffff 0 NOMAP > 2: 0x0000000068000000..0x000000006fffffff 0 DRV_MNG > 3: 0x0000000088800000..0x0000000094ffefff 0 NONE > 4: 0x0000000094fff000..0x0000000094ffffff 0 NOMAP > max_pfn will affect read_page_owner. Therefore, it should first compare and > then select the larger value for max_pfn. > > Fixes: 8fac67ca236b ("arm64: mm: update max_pfn after memory hotplug") > Signed-off-by: Zhenhua Huang > --- > arch/arm64/mm/mmu.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c > index 1dfe1a8efdbe..310ff75891ef 100644 > --- a/arch/arm64/mm/mmu.c > +++ b/arch/arm64/mm/mmu.c > @@ -1361,7 +1361,8 @@ int arch_add_memory(int nid, u64 start, u64 size, > __remove_pgd_mapping(swapper_pg_dir, > __phys_to_virt(start), size); > else { > - max_pfn = PFN_UP(start + size); > + /* Address of hotplugged memory can be smaller */ > + max_pfn = max(max_pfn, PFN_UP(start + size)); > max_low_pfn = max_pfn; > } > Acked-by: David Hildenbrand -- Cheers, David / dhildenb