linux-kernel - Re: [RFC][PATCH 0/5] arch: atomic rework

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Message-ID: <52F3DA85.1060209@arm.com>
Date:	Thu, 06 Feb 2014 18:55:01 +0000
From:	Ramana Radhakrishnan <ramrad01@....com>
To:	David Howells <dhowells@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	Will Deacon <Will.Deacon@....com>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	"gcc@....gnu.org" <gcc@....gnu.org>
Subject: Re: [RFC][PATCH 0/5] arch: atomic rework

On 02/06/14 18:25, David Howells wrote:
>
> Is it worth considering a move towards using C11 atomics and barriers and
> compiler intrinsics inside the kernel?  The compiler _ought_ to be able to do
> these.


It sounds interesting to me, if we can make it work properly and 
reliably. + gcc@....gnu.org for others in the GCC community to chip in.

>
> One thing I'm not sure of, though, is how well gcc's atomics will cope with
> interrupt handlers touching atomics on CPUs without suitable atomic
> instructions - that said, userspace does have to deal with signals getting
> underfoot. but then userspace can't normally disable interrupts.
>
> David
>

Ramana

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