> -----Original Message----- > From: Greg KH [mailto:gre...@linuxfoundation.org] > Sent: Thursday, March 31, 2016 5:01 PM > To: KY Srinivasan <k...@microsoft.com> > Cc: linux-kernel@vger.kernel.org; de...@linuxdriverproject.org; > o...@aepfle.de; a...@canonical.com; vkuzn...@redhat.com; > jasow...@redhat.com > Subject: Re: [PATCH 2/7] Drivers: hv: vmbus: Use READ_ONCE() to read > variables that are volatile > > On Wed, Mar 23, 2016 at 05:53:52PM -0700, K. Y. Srinivasan wrote: > > Use the READ_ONCE macro to access variabes that can change > asynchronously. > > Why? What is this "fixing"?
This is to prevent the compiler optimizations and moving the code. This is the recommended mechanism for reading volatile variables. Regards, K. Y > > thanks, > > greg k-h
