linux-kernel - Re: [PATCH v5 1/3] VT: Use macros to define ioctls

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Date: Wed, 29 May 2024 09:29:23 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Alexey Gladkov <legion@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, kbd@...ts.linux.dev,
 linux-api@...r.kernel.org, linux-fbdev@...r.kernel.org,
 linux-serial@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
 Arnd Bergmann <arnd@...nel.org>
Subject: Re: [PATCH v5 1/3] VT: Use macros to define ioctls

On 18. 04. 24, 8:18, Greg Kroah-Hartman wrote:
> On Wed, Apr 17, 2024 at 07:37:35PM +0200, Alexey Gladkov wrote:
>> 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.
>>
>> Signed-off-by: Alexey Gladkov <legion@...nel.org>
>> ---
>>   include/uapi/linux/kd.h | 96 +++++++++++++++++++++--------------------
>>   1 file changed, 49 insertions(+), 47 deletions(-)
> 
> This is a nice cleanup, thanks for doing it, I'll just take this one
> change now if you don't object.

Unfortunately, _IOC_NONE is 1 on some archs as noted by Arnd, and this 
commit changed the kd ioctl values in there which broke stuff as noted 
by Al.

We either:
* use _IOC(0, X, Y) in here, instead of _IO(X, Y), or
* define KDIOC(X) as _IOC(0, KD_IOCTL_BASE, X), or
* revert the commit which landed to -rc1 already.

thanks,
-- 
js