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Subject[PATCH 6/8] RISC-V: Use mmgrab()
Date
From
f1f1007644ff ("mm: add new mmgrab() helper") added a helper that we
missed out on.

Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
---
arch/riscv/kernel/smpboot.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index e1f6a5ad0416..5437a04babcd 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -30,6 +30,7 @@
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/sched/task_stack.h>
+#include <linux/sched/mm.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
@@ -79,8 +80,8 @@ 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();
@@ -100,7 +101,7 @@ asmlinkage void __init smp_callin(void)
struct mm_struct *mm = &init_mm;

/* All kernel threads share the same mm context. */
- atomic_inc(&mm->mm_count);
+ mmgrab(mm);
current->active_mm = mm;

trap_init();
--
2.16.4
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