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

From: Ramana Radhakrishnan <ramrad01 at arm dot com>
To: David Howells <dhowells at redhat dot com>
Cc: Peter Zijlstra <peterz at infradead dot org>, "linux-arch at vger dot kernel dot org" <linux-arch at vger dot kernel dot org>, "linux-kernel at vger dot kernel dot org" <linux-kernel at vger dot kernel dot org>, "torvalds at linux-foundation dot org" <torvalds at linux-foundation dot org>, "akpm at linux-foundation dot org" <akpm at linux-foundation dot org>, "mingo at kernel dot org" <mingo at kernel dot org>, Will Deacon <Will dot Deacon at arm dot com>, "paulmck at linux dot vnet dot ibm dot com" <paulmck at linux dot vnet dot ibm dot com>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
Date: Thu, 06 Feb 2014 18:55:01 +0000
Subject: Re: [RFC][PATCH 0/5] arch: atomic rework
Authentication-results: sourceware.org; auth=none
References: <20140206134825 dot 305510953 at infradead dot org> <21984 dot 1391711149 at warthog dot procyon dot org dot uk>

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 andreliably. + gcc@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

Follow-Ups:
- Re: [RFC][PATCH 0/5] arch: atomic rework
  - From: Will Deacon

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