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We are unable to produce load/store barriers for pre-ARMv7 targets. Phab:D894 added dummy cases to SMP.h for these barriers to prevent the build from failing under the assumption that there are no SMP-capable devices of this vintage. However, #10433 points out that it is more correct to simply set NOSMP for such targets. Tested By: rwbarton Test Plan: Validate Reviewers: erikd, rwbarton, austin Reviewed By: rwbarton Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1704 GHC Trac Issues: #10433
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