linux-kernel - Re: [PATCH v5 1/6] mm: add ARCH_SUPPORTS_NON_LEAF

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Message-ID: <z5rp6yyr6ofr7fgiyt2nxwqszls4otirx6eohq6d3qozxtujzq@72talp4b36tc>
Date: Mon, 15 Jul 2024 16:24:26 -0500
From: Maxwell Bland <mbland@...orola.com>
To: kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-mm@...ck.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ard Biesheuvel <ardb@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Maxwell Bland <mbland@...orola.com>,
        Alexandre Ghiti <alexghiti@...osinc.com>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, oliver.sang@...el.com
Subject: Re: [PATCH v5 1/6] mm: add ARCH_SUPPORTS_NON_LEAF_PTDUMP

On Fri, Jul 05, 2024 at 10:52:26AM GMT, kernel test robot wrote:
> 
> 
> Hello,
> 
> kernel test robot noticed "WARNING:at_arch/x86/mm/dump_pagetables.c:#note_page" on:
> 
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20240705/202407051002.96bf438-oliver.sang@intel.com
> 

Note this config has CONFIG_ARCH_SUPPORTS_NON_LEAF_PTDUMP=y, added by
this patchset, but x86 does not yet support non-leaf ptdump semantics.

x86 support is on my TODOs, but I am caught up in other work (a LSM
and/or *.ko preventing dynamically-allocated datastructure write
gadgets! (-: ).

Regards,
Maxwell Bland