[PATCH v3 03/12] RISC-V: Comment on the TLB flush in smp_callin()

[Atish Patra]

From: Palmer Dabbelt <pal...@sifive.com>

This isn't readily apparent from reading the code.

Signed-off-by: Palmer Dabbelt <pal...@sifive.com>
[Atish: code comment formatting update]
Signed-off-by: Atish Patra <atish.pa...@wdc.com>
---
 arch/riscv/kernel/smpboot.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 56abab6a..712e9ca8 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -106,6 +106,10 @@ asmlinkage void __init smp_callin(void)
        trap_init();
        notify_cpu_starting(smp_processor_id());
        set_cpu_online(smp_processor_id(), 1);
+       /*
+        * Remote TLB flushes are ignored while the CPU is offline, so emit
+        * a local TLB flush right now just in case.
+        */
        local_flush_tlb_all();
        local_irq_enable();
        preempt_disable();
-- 
2.7.4