Re: [PATCH] ACPI: GTDT: Relax sanity checking on Platform Timers array count

Marc Zyngier
2025-01-28T08:46:53Z

On Tue, 28 Jan 2025 00:17:49 +0000,
Oliver Upton <oliver.upton@linux.dev> wrote:
>
> Perhaps unsurprisingly there are some platforms where the GTDT isn't
> quite right and the Platforms Timer array overflows the length of the
> overall table.

Colour me shocked! Broken ACPI tables? [insert REM song here].

>
> While the recently-added sanity checking isn't wrong, it makes it
> impossible to boot the kernel on offending platforms. Try to hobble
> along and limit the Platform Timer count to the bounds of the table.
>
> Cc: Marc Zyngier <maz@kernel.org>
> Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
> Cc: Zheng Zengkai <zhengzengkai@huawei.com>
> Cc: stable@vger.kernel.org
> Fixes: 263e22d6bd1f ("ACPI: GTDT: Tighten the check for the array of platform timer structures")
> Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

Acked-by: Marc Zyngier <maz@kernel.org>

M.

--
Without deviation from the norm, progress is not possible.