linux-kernel - Re: In-kernel parser for the BMOF format used by WMI-ACPI

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Message-ID: <20250311210238.fjv4ssohn2l2qzih@pali>
Date: Tue, 11 Mar 2025 22:02:38 +0100
From: Pali Rohár <pali@...nel.org>
To: Armin Wolf <W_Armin@....de>
Cc: "linux@...ssschuh.net" <linux@...ssschuh.net>,
	Kurt Borja <kuurtb@...il.com>, akpm@...ux-foundation.org,
	mcgrof@...nel.org, russ.weight@...ux.dev, dakr@...nel.org,
	"platform-driver-x86@...r.kernel.org" <platform-driver-x86@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: In-kernel parser for the BMOF format used by WMI-ACPI

On Tuesday 11 March 2025 21:59:29 Armin Wolf wrote:
> Am 11.03.25 um 21:13 schrieb Pali Rohár:
> 
> > On Tuesday 11 March 2025 21:06:16 Armin Wolf wrote:
> > >   - Is there any way to check whether the Doublespace compression algorithm is still encumbered by patents?
> > Linux kernel 2.2 or 2.4 had full read/write support for doublespace
> > compression algorithm in mainline kernel and it was connected with fat
> > driver. IIRC it was dropped for kernel 2.6 because nobody ported that
> > vfat code to new fs API and hence doublespace in-kernel compression
> > algorithm was not needed/used anymore. But I do not remember details.
> > 
> > So IMHO it should not be a problem to reintroduce same code into kernel
> > again if there is a new need for it.
> > 
> > And in my project I reused the doublespace compression code from old
> > Linux kernel.
> 
> AFAIK only the CVF code used by the dmsdos driver was inside the mainline kernel,
> but not the dmsdos driver itself.

Ok, probably I remember it incorrectly. It is too long ago.