RISC-V: Use mmgrab()

commit f1f1007644ff ("mm: add new mmgrab() helper") added a
helper that we missed out on.

Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 4a232600cedb..17e748312afd 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>
@@ -101,7 +102,7 @@ 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();