Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Atish Patra <atish.patra@wdc.com>
To:     palmer@sifive.com, linux-riscv@lists.infradead.org
Cc:     mark.rutland@arm.com, hch@infradead.org, anup@brainfault.org,
        atish.patra@wdc.com, tglx@linutronix.de,
        linux-kernel@vger.kernel.org, Damien.LeMoal@wdc.com,
        marc.zyngier@arm.com, jeremy.linton@arm.com,
        gregkh@linuxfoundation.org, jason@lakedaemon.net,
        catalin.marinas@arm.com, dmitriy@oss-tech.org,
        ard.biesheuvel@linaro.org
Subject: [PATCH v4 09/12] RISC-V: Use mmgrab()
Date:   Tue, 11 Sep 2018 13:05:36 -0700
Message-Id: <1536696339-15204-10-git-send-email-atish.patra@wdc.com>
In-Reply-To: <1536696339-15204-1-git-send-email-atish.patra@wdc.com>
References: <1536696339-15204-1-git-send-email-atish.patra@wdc.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Palmer Dabbelt <palmer@sifive.com>

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>
---
 arch/riscv/kernel/smpboot.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 4a232600..17e74831 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();
-- 
2.7.4