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Date:   Sat, 7 Sep 2019 01:30:45 +0200
From:   Greg KH <greg@kroah.com>
To:     Mark Salyzyn <salyzyn@android.com>
Cc:     linux-kernel@vger.kernel.org, kernel-team@android.com,
        Johannes Berg <johannes@sipsolutions.net>,
        "David S. Miller" <davem@davemloft.net>,
        Marcel Holtmann <marcel@holtmann.org>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        stable@vger.kernel.org
Subject: Re: [PATCH v2] net: enable wireless core features with
 LEGACY_WEXT_ALLCONFIG
Message-ID: <20190906233045.GB9478@kroah.com>
References: <20190906192403.195620-1-salyzyn@android.com>
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On Fri, Sep 06, 2019 at 12:24:00PM -0700, Mark Salyzyn wrote:
> In embedded environments the requirements are to be able to pick and
> chose which features one requires built into the kernel.  If an
> embedded environment wants to supports loading modules that have been
> kbuilt out of tree, there is a need to enable hidden configurations
> for legacy wireless core features to provide the API surface for
> them to load.
> 
> Introduce CONFIG_LEGACY_WEXT_ALLCONFIG to select all legacy wireless
> extension core features by activating in turn all the associated
> hidden configuration options, without having to specifically select
> any wireless module(s).
> 
> Signed-off-by: Mark Salyzyn <salyzyn@android.com>
> Cc: kernel-team@android.com
> Cc: Johannes Berg <johannes@sipsolutions.net>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Marcel Holtmann <marcel@holtmann.org>
> Cc: linux-wireless@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: stable@vger.kernel.org # 4.19
> ---
> v2: change name and documentation to CONFIG_LEGACY_WEXT_ALLCONFIG
> ---
>  net/wireless/Kconfig | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/net/wireless/Kconfig b/net/wireless/Kconfig
> index 67f8360dfcee..0d646cf28de5 100644
> --- a/net/wireless/Kconfig
> +++ b/net/wireless/Kconfig
> @@ -17,6 +17,20 @@ config WEXT_SPY
>  config WEXT_PRIV
>  	bool
>  
> +config LEGACY_WEXT_ALLCONFIG
> +	bool "allconfig for legacy wireless extensions"
> +	select WIRELESS_EXT
> +	select WEXT_CORE
> +	select WEXT_PROC
> +	select WEXT_SPY
> +	select WEXT_PRIV
> +	help
> +	  Config option used to enable all the legacy wireless extensions to
> +	  the core functionality used by add-in modules.
> +
> +	  If you are not building a kernel to be used for a variety of
> +	  out-of-kernel built wireless modules, say N here.
> +
>  config CFG80211
>  	tristate "cfg80211 - wireless configuration API"
>  	depends on RFKILL || !RFKILL
> -- 
> 2.23.0.187.g17f5b7556c-goog
> 

How is this patch applicable to stable kernels???