linux-kernel - Re: PROBLEM: kbd busted in linux 6.10-rc1 (regression)

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Message-ID: <20240529052543.GL2118490@ZenIV>
Date: Wed, 29 May 2024 06:25:43 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: Nick Bowler <nbowler@...conx.ca>
Cc: linux-kernel@...r.kernel.org,
	Linux regressions mailing list <regressions@...ts.linux.dev>,
	Alexey Gladkov <legion@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: PROBLEM: kbd busted in linux 6.10-rc1 (regression)

On Wed, May 29, 2024 at 12:45:56AM -0400, Nick Bowler quoted:

>        All other headers use _IOC() macros to describe ioctls for a long time
>        now. This header is stuck in the last century.
>    
>        Simply use the _IO() macro. No other changes.

.. are needed, since _IO() is arch-dependent; this is quite enough to fuck
alpha and sparc over.  _IO(x,y) is (1<<29) + 256*x + y there; both ports
got started with compat userland support, so _IO...() family there is
modelled after OSF/1 and Solaris resp.

kbd ioctls predate all of that.

Please, revert 8c467f330059 - commit in question breaks userland on alpha
and on sparc for no reason whatsoever.  Might be worth adding a comment
to those definitions at some point, but that can go on top of revert.

Folks, 0xXYZW is *not* an uncool way to spell _IO(0xXY,0xZW) - if there's
any chance that those definitions are seen on all architectures, they
should be left alone.