linux-kernel - Re: [PATCHv10 11/18] x86/mm: Make e820_end_ram_pfn() cover E820_TYPE

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Message-ID: <20240508121217.GDZjtsIZmROSwirNUF@fat_crate.local>
Date: Wed, 8 May 2024 14:12:17 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	Elena Reshetova <elena.reshetova@...el.com>,
	Jun Nakajima <jun.nakajima@...el.com>,
	Rick Edgecombe <rick.p.edgecombe@...el.com>,
	Tom Lendacky <thomas.lendacky@....com>,
	"Kalra, Ashish" <ashish.kalra@....com>,
	Sean Christopherson <seanjc@...gle.com>,
	"Huang, Kai" <kai.huang@...el.com>, Baoquan He <bhe@...hat.com>,
	kexec@...ts.infradead.org, linux-coco@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
	Tao Liu <ltao@...hat.com>
Subject: Re: [PATCHv10 11/18] x86/mm: Make e820_end_ram_pfn() cover
 E820_TYPE_ACPI ranges

On Tue, Apr 09, 2024 at 02:30:03PM +0300, Kirill A. Shutemov wrote:
> Subject: Re: [PATCHv10 11/18] x86/mm: Make e820_end_ram_pfn() cover E820_TYPE_ACPI ranges
						^^^^^^^

e820__end_of_ram_pfn()

> e820__end_of_ram_pfn() is used to calculate max_pfn which, among other
> things, guides where direct mapping ends. Any memory above max_pfn is
> not going to be present in the direct mapping.
> 
> e820__end_of_ram_pfn() finds the end of the ram based on the highest

RAM

..

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette