linux-kernel - Re: [PATCH 03/29] x86/boot/e820: Simplify the PPro Erratum #50 workaround

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Message-ID: <aAc3LGfa7HTBJqWx@surfacebook.localdomain>
Date: Tue, 22 Apr 2025 09:29:00 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org, Andy Shevchenko <andy@...nel.org>,
	Arnd Bergmann <arnd@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Juergen Gross <jgross@...e.com>, "H . Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Rapoport <rppt@...nel.org>,
	Paul Menzel <pmenzel@...gen.mpg.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Woodhouse <dwmw@...zon.co.uk>
Subject: Re: [PATCH 03/29] x86/boot/e820: Simplify the PPro Erratum #50
 workaround

Mon, Apr 21, 2025 at 08:51:43PM +0200, Ingo Molnar kirjoitti:
> No need to print out the table - users won't really be able
> to tell much from it anyway and the messages around this
> erratum are unnecessarily obtuse.
> 
> Instead clearly inform the user that a 256 kB hole is being
> punched in their memory map at the 1.75 GB physical address.
> 
> Not that there are many PPro users left. :-)

...

> +		e820__range_update(0x70000000ULL, 0x40000ULL, E820_TYPE_RAM, E820_TYPE_RESERVED);

Perhaps, 0x40000ULL --> SZ_256K ?

-- 
With Best Regards,
Andy Shevchenko