linux-kernel - Re: [PATCH v3 1/2] x86/mm: Handle alloc failure in phys_*

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Message-ID: <586a10c2-fc65-4b39-add6-c383bbf46078@intel.com>
Date: Wed, 11 Jun 2025 12:36:20 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Em Sharnoff <sharnoff@...n.tech>, linux-kernel@...r.kernel.org,
 x86@...nel.org, linux-mm@...ck.org
Cc: Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
 Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
 Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
 "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
 Oleg Vasilev <oleg@...n.tech>, Arthur Petukhovsky <arthur@...n.tech>,
 Stefan Radig <stefan@...n.tech>, Misha Sakhnov <misha@...n.tech>
Subject: Re: [PATCH v3 1/2] x86/mm: Handle alloc failure in phys_*_init()

On 6/11/25 12:26, Em Sharnoff wrote:
> 2. Change the phys_*_init() functions to return int, and directly update
>    max_pfn_mapped from within them. They already call update_page_count(),
>    maybe this is similar?

That seems like the most straightforward. Each time they update a
mapping, they call a helper which bumps up 'max_pfn_mapped'.