linux-kernel - Re: [PATCH] ARM/hw_breakpoint: Fix possible recursive locking for arch_hw_breakpoint

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Date:   Fri, 16 Jun 2017 17:42:45 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH] ARM/hw_breakpoint: Fix possible recursive locking for
 arch_hw_breakpoint_init

On 2017-06-16 01:22:38 [-0700], Tony Lindgren wrote:
> Recent change to use cpuhp_setup_state_cpuslocked() with commit
> fe2a5cd8aa03 ("ARM/hw_breakpoint: Use cpuhp_setup_state_cpuslocked()")
> missed to change the related paired cpuhp_remove_state_nocalls_cpuslocked().
> 
> Now if arch_hw_breakpoint_init() fails, we get "WARNING: possible recursive
> locking detected" on the exit path.
> 
> Fixes: fe2a5cd8aa03 ("ARM/hw_breakpoint: Use
> cpuhp_setup_state_cpuslocked()")
> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: linux-arm-kernel@...ts.infradead.org
> Signed-off-by: Tony Lindgren <tony@...mide.com>

Acked-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Thank you.

Sebastian