linux-kernel - Re: [Regression] Missing device nodes for ETR, ETF and STM after CONFIG_UEVENT

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Message-ID: <20190726133316.688a43d8@windsurf>
Date:   Fri, 26 Jul 2019 13:33:16 +0200
From:   Thomas Petazzoni <thomas.petazzoni@...tlin.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Leo Yan <leo.yan@...aro.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [Regression] Missing device nodes for ETR, ETF and STM after
 CONFIG_UEVENT_HELPER=n

Hello,

On Fri, 26 Jul 2019 12:19:25 +0200
Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> > This somehow is not mounting etr, etf, stm devices when uevent-helper is
> > disabled. Anyways as Suzuki mentioned, using devtmpfs does fix the issue.  
> 
> Last I looked (many years ago) mdev requires uevent-helper in order for
> it to work.  I recommend that if you rely on mdev to keep that option
> enabled, or to just use devtmpfs and udev :)

Since Busybox 1.31.0, mdev has gained a daemon mode. In this mode, mdev
runs in the background, and receives uevent through a netlink socket.
So there's been some changes in how Busybox mdev works in recent times.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com