linux-kernel - Re: [PATCH 5.10 245/530] tty: actually undefine superseded ASYNC flags

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Date:   Wed, 12 May 2021 17:17:32 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.10 245/530] tty: actually undefine superseded ASYNC
 flags

On Wed, May 12, 2021 at 04:45:55PM +0200, Greg Kroah-Hartman wrote:
> From: Johan Hovold <johan@...nel.org>
> 
> [ Upstream commit d09845e98a05850a8094ea8fd6dd09a8e6824fff ]
> 
> Some kernel-internal ASYNC flags have been superseded by tty-port flags
> and should no longer be used by kernel drivers.
> 
> Fix the misspelled "__KERNEL__" compile guards which failed their sole
> purpose to break out-of-tree drivers that have not yet been updated.
> 
> Fixes: 5c0517fefc92 ("tty: core: Undefine ASYNC_* flags superceded by TTY_PORT* flags")
> Signed-off-by: Johan Hovold <johan@...nel.org>
> Link: https://lore.kernel.org/r/20210407095208.31838-2-johan@kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

I don't think this should be backported to any stable tree and the
stable tag was left out on purpose.

> ---
>  include/uapi/linux/tty_flags.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/tty_flags.h b/include/uapi/linux/tty_flags.h
> index 900a32e63424..6a3ac496a56c 100644
> --- a/include/uapi/linux/tty_flags.h
> +++ b/include/uapi/linux/tty_flags.h
> @@ -39,7 +39,7 @@
>   * WARNING: These flags are no longer used and have been superceded by the
>   *	    TTY_PORT_ flags in the iflags field (and not userspace-visible)
>   */
> -#ifndef _KERNEL_
> +#ifndef __KERNEL__
>  #define ASYNCB_INITIALIZED	31 /* Serial port was initialized */
>  #define ASYNCB_SUSPENDED	30 /* Serial port is suspended */
>  #define ASYNCB_NORMAL_ACTIVE	29 /* Normal device is active */
> @@ -81,7 +81,7 @@
>  #define ASYNC_SPD_WARP		(ASYNC_SPD_HI|ASYNC_SPD_SHI)
>  #define ASYNC_SPD_MASK		(ASYNC_SPD_HI|ASYNC_SPD_VHI|ASYNC_SPD_SHI)
>  
> -#ifndef _KERNEL_
> +#ifndef __KERNEL__
>  /* These flags are no longer used (and were always masked from userspace) */
>  #define ASYNC_INITIALIZED	(1U << ASYNCB_INITIALIZED)
>  #define ASYNC_NORMAL_ACTIVE	(1U << ASYNCB_NORMAL_ACTIVE)

Johan