linux-kernel - Re: [PATCH] x86/mm: Fix log overwrite in CPA check

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Message-ID: <20250620090140.GR1613376@noisy.programming.kicks-ass.net>
Date: Fri, 20 Jun 2025 11:01:40 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Khalid Ali <khaliidcaliy@...il.com>
Cc: dave.hansen@...ux.intel.com, luto@...nel.org, tglx@...utronix.de,
	mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/mm: Fix log overwrite in CPA check_conflict()

On Thu, Jun 19, 2025 at 05:42:41PM +0000, Khalid Ali wrote:
> From: Khalid Ali <khaliidcaliy@...il.com>
> 
> On certain configurations (e.g. custom builds), check_conflict()
> may produce a large number of warnings, flooding the kernel log
> and overwriting earlier messages.
> 
> Observed warning:
> 
>   CPA  protect  Rodata RO: 0xffff888022a75000 - 0xffff888022a75fff
>         PFN 22a75 req 8000000000000023 prevent 0000000000000002

That's not good. Your system is sick, limiting the warns isn't making
that better.