linux-kernel - Re: [patch 13/35] net: mdiobus: Remove WARN_ON_ONCE(in

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Date:   Mon, 28 Sep 2020 01:00:52 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Paul McKenney <paulmck@...nel.org>,
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        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
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Subject: Re: [patch 13/35] net: mdiobus: Remove WARN_ON_ONCE(in_interrupt())

On Sun, Sep 27, 2020 at 09:48:59PM +0200, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 
> in_interrupt() is ill defined and does not provide what the name
> suggests. The usage especially in driver code is deprecated and a tree wide
> effort to clean up and consolidate the (ab)usage of in_interrupt() and
> related checks is happening.
> 
> In this case the check covers only parts of the contexts in which these
> functions cannot be called. It fails to detect preemption or interrupt
> disabled invocations.
> 
> As the functions which contain these warnings invoke mutex_lock() which
> contains a broad variety of checks (always enabled or debug option
> dependent) and therefore covers all invalid conditions already, there is no
> point in having inconsistent warnings in those drivers. The conditional
> return is not really valuable in practice either.
> 
> Just remove them.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew