Messages in this thread Patch in this message | | | Date | Wed, 07 Jun 2017 18:15:06 +0200 | From | Peter Zijlstra <> | Subject | [RFC][PATCH 5/5] powerpc: Remove SYNC from _switch |
| |
Now that the scheduler's rq->lock is RCsc and thus provides full transitivity between scheduling actions. And since we cannot migrate current, a task needs a switch-out and a switch-in in order to migrate, in which case the RCsc provides all the ordering we need.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- arch/powerpc/kernel/entry_64.S | 8 -------- 1 file changed, 8 deletions(-)
--- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -488,14 +488,6 @@ _GLOBAL(_switch) std r23,_CCR(r1) std r1,KSP(r3) /* Set old stack pointer */ -#ifdef CONFIG_SMP - /* We need a sync somewhere here to make sure that if the - * previous task gets rescheduled on another CPU, it sees all - * stores it has performed on this one. - */ - sync -#endif /* CONFIG_SMP */ - /* * If we optimise away the clear of the reservation in system * calls because we know the CPU tracks the address of the
| |