From: Will Deacon <will@kernel.org>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Brown <broonie@kernel.org>,
Ryan Roberts <ryan.roberts@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ard Biesheuvel <ardb@kernel.org>,
Ritesh Harjani <ritesh.list@gmail.com>,
linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org
Subject: Re: [PATCH 0/3] arm64/ptdump: Add cmdline 'early_ptdump'
Date: Thu, 18 Sep 2025 13:02:26 +0100 [thread overview]
Message-ID: <aMv00p44PyZZv7cH@willie-the-truck> (raw)
In-Reply-To: <20250910094623.2356282-1-anshuman.khandual@arm.com>
On Wed, Sep 10, 2025 at 03:16:20PM +0530, Anshuman Khandual wrote:
> Enable early kernel page table dump for debug purpose when required through
> a new kernel command line option 'early_ptdump'. But first this reorganizes
> ptdump_init() separating out the debugfs creation, so that it can be called
> early on in setup_arch(). This also adds kernel dmesg console print support
> for existing pt_dump_seq_[printf|puts]() helpers.
>
> This series applies on v6.17-rc5
>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Ryan Roberts <ryan.roberts@arm.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Ard Biesheuvel <ardb@kernel.org>
> Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-efi@vger.kernel.org
I'm really not convinced this is particularly useful and I've certainly
never felt the need to have something like it. If you're debugging really
early page-table issues, why you want to rely on all the ptdump
infrastructure to get logs out?
On the other hand, if people do find this useful, then I think it should
be implemented in the core code rather than done behind its back in the
arch code.
Will
prev parent reply other threads:[~2025-09-18 12:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-10 9:46 [PATCH 0/3] arm64/ptdump: Add cmdline 'early_ptdump' Anshuman Khandual
2025-09-10 9:46 ` [PATCH 1/3] arm64/ptdump: Re-organize ptdump_init() Anshuman Khandual
2025-09-10 9:46 ` [PATCH 2/3] arm64/ptdump: Enable console output in pt_dump_seq_[printf|puts]() Anshuman Khandual
2025-09-10 9:46 ` [PATCH 3/3] arm64/ptdump: Add 'early_ptdump' kernel command line option Anshuman Khandual
2025-09-18 12:02 ` Will Deacon [this message]
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