arm64: Do not attempt to use init_mm in reset_context()

[cascardo/linux.git] / arch / arm64 / mm / context.c

diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c
index baa758d..76c1e6c 100644 (file)
--- a/arch/arm64/mm/context.c
+++ b/arch/arm64/mm/context.c
@@ -92,6 +92,14 @@ static void reset_context(void *info)
        unsigned int cpu = smp_processor_id();
        struct mm_struct *mm = current->active_mm;
 
+       /*
+        * current->active_mm could be init_mm for the idle thread immediately
+        * after secondary CPU boot or hotplug. TTBR0_EL1 is already set to
+        * the reserved value, so no need to reset any context.
+        */
+       if (mm == &init_mm)
+               return;
+
        smp_rmb();
        asid = cpu_last_asid + cpu;