linux-kernel - Re: [PATCH v3] arm64: Expose the end of the linear map in PHYSMEM

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Message-Id: <172546436035.2663988.13656024915203929376.b4-ty@kernel.org>
Date: Wed,  4 Sep 2024 17:12:36 +0100
From: Will Deacon <will@...nel.org>
To: Catalin M arinas <catalin.marinas@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ard Biesheuvel <ardb@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	D Scott Phillips <scott@...amperecomputing.com>
Cc: kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	Alison Schofield <alison.schofield@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Ankit Agrawal <ankita@...dia.com>,
	Baoquan He <bhe@...hat.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Wang Jinchao <wangjinchao@...sion.com>,
	linux-kernel@...r.kernel.org,
	patches@...erecomputing.com
Subject: Re: [PATCH v3] arm64: Expose the end of the linear map in PHYSMEM_END

On Tue, 03 Sep 2024 09:45:32 -0700, D Scott Phillips wrote:
> The memory hot-plug and resource management code needs to know the
> largest address which can fit in the linear map, so set
> PHYSMEM_END for that purpose.
> 
> This fixes a crash[1] at boot when amdgpu tries to create
> DEVICE_PRIVATE_MEMORY and is given a physical address by the
> resource management code which is outside the range which can have
> a `struct page`
> 
> [...]

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

I dropped the cc: stable, however, as PHYSMEM_END looks like it only
exists in linux-next.

[1/1] arm64: Expose the end of the linear map in PHYSMEM_END
      https://git.kernel.org/arm64/c/eeb8fdfcf090

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev