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From:   Atish Patra <atish.patra@wdc.com>
To:     linux-riscv@lists.infradead.org, palmer@sifive.com
Cc:     anup@brainfault.org, hch@infradead.org,
        linux-kernel@vger.kernel.org, atish.patra@wdc.com
Subject: [PATCH v6 10/14] RISC-V: Use WRITE_ONCE instead of direct access
Date:   Tue,  2 Oct 2018 12:15:03 -0700
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The secondary harts spin on couple of per cpu variables until both of
these are non-zero so it's not necessary to have any ordering here.
However, WRITE_ONCE should be used to avoid tearing.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 arch/riscv/kernel/smpboot.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 17e74831..1e478615 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -81,8 +81,9 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 	 * the spinning harts that they can continue the boot process.
 	 */
 	smp_mb();
-	__cpu_up_stack_pointer[cpu] = task_stack_page(tidle) + THREAD_SIZE;
-	__cpu_up_task_pointer[cpu] = tidle;
+	WRITE_ONCE(__cpu_up_stack_pointer[cpu],
+		  task_stack_page(tidle) + THREAD_SIZE);
+	WRITE_ONCE(__cpu_up_task_pointer[cpu], tidle);
 
 	while (!cpu_online(cpu))
 		cpu_relax();
-- 
2.7.4