linux-kernel - Re: [tip: x86/urgent] x86/e820: Discard high memory that can't be addressed by 32-bit systems

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Message-ID: <Z_9ZblhCgEeTgGQ8@gmail.com>
Date: Wed, 16 Apr 2025 09:17:02 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Mike Rapoport <rppt@...nel.org>, linux-kernel@...r.kernel.org,
	linux-tip-commits@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
	Andy Shevchenko <andy@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Davide Ciminaghi <ciminaghi@...dd.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org,
	x86@...nel.org
Subject: Re: [tip: x86/urgent] x86/e820: Discard high memory that can't be
 addressed by 32-bit systems


* Dave Hansen <dave.hansen@...el.com> wrote:

> On 4/15/25 00:18, Mike Rapoport wrote:
> >> How about we reuse 'MAX_NONPAE_PFN' like this:
> >>
> >> 	if (IS_ENABLED(CONFIG_X86_32))
> >> 		memblock_remove(PFN_PHYS(MAX_NONPAE_PFN), -1);
> >>
> >> Would that make the connection more obvious?
> > Yes, that's better. Here's the updated patch:
> 
> Looks, great. Thanks for the update and the quick turnaround on the
> first one after the bug report!
> 
> Tested-by: Dave Hansen <dave.hansen@...el.com>
> Acked-by: Dave Hansen <dave.hansen@...el.com>

I've amended the fix in tip:x86/urgent accordingly and added your tags, 
thanks!

	Ingo