Re: bit fields && data tearing

From: H. Peter Anvin
Date: Fri Sep 05 2014 - 16:35:34 EST

On 09/05/2014 01:14 PM, Peter Hurley wrote:
> Here's how I read the two statements.
> First, the commit message:
> "It [this commit] documents that CPUs [supported by the Linux kernel]
> _must provide_ atomic one-byte and two-byte naturally aligned loads and stores."
> Second, in the body of the document:
> "The Linux kernel no longer supports pre-EV56 Alpha CPUs, because these
> older CPUs _do not provide_ atomic one-byte and two-byte loads and stores."

Does this apply in general or only to SMP configurations? I guess
non-SMP configurations would still have problems if interrupted in the
wrong place...


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