linux-kernel - Re: [PATCH v2] arm64/debug: Remove superfluous SMP function call

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Date:	Thu, 14 Apr 2016 18:13:39 +0100
From:	Will Deacon <will.deacon@....com>
To:	Anna-Maria Gleixner <anna-maria@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, rt@...utronix.de,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] arm64/debug: Remove superfluous SMP function call

On Wed, Apr 06, 2016 at 10:42:28AM +0200, Anna-Maria Gleixner wrote:
> Since commit 1cf4f629d9d2 ("cpu/hotplug: Move online calls to
> hotplugged cpu") it is ensured that callbacks of CPU_ONLINE and
> CPU_DOWN_PREPARE are processed on the hotplugged CPU. Due to this SMP
> function calls are no longer required.
> 
> Replace smp_call_function_single() with a direct call to
> clear_os_lock(). The function writes the OSLAR register to clear OS
> locking. This does not require to be called with interrupts disabled,
> therefore the smp_call_function_single() calling convention is not
> preserved.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
> ---
>  arch/arm64/kernel/debug-monitors.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)

Applied this and the hw_breakpoint one too, thanks.

Will