linux-kernel - Re: [PATCH] arm64: replace read_lock to rcu lock in call_step

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Message-ID: <20160209160442.GS22874@arm.com>
Date:	Tue, 9 Feb 2016 16:04:42 +0000
From:	Will Deacon <will.deacon@....com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Yang Shi <yang.shi@...aro.org>, linaro-kernel@...ts.linaro.org,
	linux-rt-users@...r.kernel.org, catalin.marinas@....com,
	bigeasy@...utronix.de, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: replace read_lock to rcu lock in call_step_hook

On Tue, Feb 09, 2016 at 10:07:58AM -0500, Steven Rostedt wrote:
> On Tue, 9 Feb 2016 14:54:26 +0000
> Will Deacon <will.deacon@....com> wrote:
> 
> 
> > Acked-by: Will Deacon <will.deacon@....com>
> 
> Will,

Hi Steve,

> The patch looks good to me. Do you want to take it through your tree?
> 
> It benefits mainline too as a rcu_read_lock() is more efficient than
> rwlocks. Although I will say this is a slow path anyway.

I was thinking that Catalin would queue it for 4.6 in the arm64 tree,
since that's probably easiest in case any unlikely conflicts crop up.

Will