linux-kernel - Re: [PATCH] arm64: mm: Correct the update of max

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Message-Id: <174319246799.4193737.10993641019327469518.b4-ty@arm.com>
Date: Fri, 28 Mar 2025 20:08:21 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: anshuman.khandual@....com,
	david@...hat.com,
	will@...nel.org,
	ryan.roberts@....com,
	mark.rutland@....com,
	ardb@...nel.org,
	yangyicong@...ilicon.com,
	joey.gouly@....com,
	quic_cgoldswo@...cinc.com,
	quic_sudaraja@...cinc.com,
	akpm@...ux-foundation.org,
	Zhenhua Huang <quic_zhenhuah@...cinc.com>
Cc: linux-mm@...ck.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	quic_tingweiz@...cinc.com
Subject: Re: [PATCH] arm64: mm: Correct the update of max_pfn

On Fri, 21 Mar 2025 15:00:19 +0800, Zhenhua Huang wrote:
> Hotplugged memory can be smaller than the original memory. For example,
> on my target:
> 
> root@...ericarmv8:~# 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.
> 
> [...]

Applied to arm64 (for-next/core), thanks!

[1/1] arm64: mm: Correct the update of max_pfn
      https://git.kernel.org/arm64/c/89f43e1ce6f6

-- 
Catalin