On Thu, 2016-12-08 at 20:19 +0900, Roger Shimizu wrote: > Dear Steve, > > Thanks for your comments! > Very informative! > > > On Thu, Dec 8, 2016 at 12:53 AM, Steve McIntyre <steve@einval.com> wrote: > > > > There are kernel helpers available to provide some atomic support, but > > they'll be very slow compared to real hardware support at this level. > > Are those kernel helper already reached Debian? > Or there's still some work here? [...] The cmpxchg32 helper has been there since 2.6.12 while the cmpxchg64 helper was added in 3.1. So all supported Debian releases have them. Ben. -- Ben Hutchings When in doubt, use brute force. - Ken Thompson
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