| Date | Thu, 31 Aug 2017 09:46:54 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 03/13] openrisc: add 1 and 2 byte cmpxchg support |
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On Thu, Aug 31, 2017 at 06:58:34AM +0900, Stafford Horne wrote: > OpenRISC only supports hardware instructions that perform 4 byte atomic > operations. For enabling qrwlocks for upcoming SMP support 1 and 2 byte > implementations are needed. To do this we leverage the 4 byte atomic > operations and shift/mask the 1 and 2 byte areas as needed. > > This heavily borrows ideas and routines from sh and mips, which do > something similar.
Is there value in lifting them into something common?
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