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Commit 2ee0a429 authored by Chris Dearman's avatar Chris Dearman Committed by Ralf Baechle
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MIPS: CMP: Fix memory barriers for correct operation of amon_cpu_start 



Signed-off-by: default avatarChris Dearman <(chris@mips.com)>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent cea2be44

arch/mips/mti-malta/malta-amon.c

+4 −3
Original line number Diff line number Diff line
@@ -70,11 +70,12 @@ void amon_cpu_start(int cpu, 
	launch->sp = sp;

	launch->a0 = a0;



	/* Make sure target sees parameters before the go bit */

	smp_mb();



	smp_wmb();              /* Target must see parameters before go */

	launch->flags |= LAUNCH_FGO;

	smp_wmb();              /* Target must see go before we poll  */



	while ((launch->flags & LAUNCH_FGONE) == 0)

		;

	smp_rmb();      /* Target will be updating flags soon */

	pr_debug("launch: cpu%d gone!\n", cpu);

}