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Date: Sun, 5 Apr 2026 07:47:11 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Danilo Krummrich <dakr@kernel.org>
Cc: Gary Guo <gary@garyguo.net>, Markus Probst <markus.probst@posteo.de>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Len Brown <lenb@kernel.org>, Miguel Ojeda <ojeda@kernel.org>,
	Boqun Feng <boqun@kernel.org>,
	=?iso-8859-1?Q?Bj=F6rn?= Roy Baron <bjorn3_gh@protonmail.com>,
	Benno Lossin <lossin@kernel.org>,
	Andreas Hindborg <a.hindborg@kernel.org>,
	Alice Ryhl <aliceryhl@google.com>, Trevor Gross <tmgross@umich.edu>,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	rust-for-linux@vger.kernel.org, driver-core@lists.linux.dev
Subject: Re: [PATCH] rust: ACPI: fix missing match data for PRP0001
Message-ID: <2026040502-monetary-mammal-667f@gregkh>
References: <20260401-rust_acpi_prp0001-v1-1-f6a4d2ef9244@posteo.de>
 <2026040124-unbolted-timing-ce25@gregkh>
 <565d58a4b766bd4a63a45da81849ea178dce5f63.camel@posteo.de>
 <DHI5Y6PNVJSJ.SCAJL0A4W2TR@kernel.org>
 <DHKOQBER5U5N.IHLHH5ORAZCQ@garyguo.net>
 <DHKOXDNO7MBC.PZK5N30ELOCG@kernel.org>
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In-Reply-To: <DHKOXDNO7MBC.PZK5N30ELOCG@kernel.org>

On Sat, Apr 04, 2026 at 11:32:44PM +0200, Danilo Krummrich wrote:
> On Sat Apr 4, 2026 at 11:23 PM CEST, Gary Guo wrote:
> > BTW, if most drivers use driver_data of ID as pointers, why is it defined as
> > kernel_ulong_t instead of just `void*`?
> 
> I think that's because the ID tables are exported to userspace via
> scripts/mod/file2alias.c. If it would be void *, then there could be a mismatch
> in size when cross compiling.
> 

That is correct, and is why it is defined this way.