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Diffstat (limited to 'arch/x86/kernel/smpboot.c')
-rw-r--r--arch/x86/kernel/smpboot.c32
1 files changed, 13 insertions, 19 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index a5e928b0cb5f..abf4a86ffc54 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -73,7 +73,6 @@
#ifdef CONFIG_X86_32
u8 apicid_2_node[MAX_APICID];
-static int low_mappings;
#endif
/* State of each CPU */
@@ -281,6 +280,18 @@ notrace static void __cpuinit start_secondary(void *unused)
* fragile that we want to limit the things done here to the
* most necessary things.
*/
+
+#ifdef CONFIG_X86_32
+ /*
+ * Switch away from the trampoline page-table
+ *
+ * Do this before cpu_init() because it needs to access per-cpu
+ * data which may not be mapped in the trampoline page-table.
+ */
+ load_cr3(swapper_pg_dir);
+ __flush_tlb_all();
+#endif
+
vmi_bringup();
cpu_init();
preempt_disable();
@@ -299,12 +310,6 @@ notrace static void __cpuinit start_secondary(void *unused)
legacy_pic->chip->unmask(0);
}
-#ifdef CONFIG_X86_32
- while (low_mappings)
- cpu_relax();
- __flush_tlb_all();
-#endif
-
/* This must be done before setting cpu_online_mask */
set_cpu_sibling_map(raw_smp_processor_id());
wmb();
@@ -750,6 +755,7 @@ do_rest:
#ifdef CONFIG_X86_32
/* Stack for startup_32 can be just as for start_secondary onwards */
irq_ctx_init(cpu);
+ initial_page_table = __pa(&trampoline_pg_dir);
#else
clear_tsk_thread_flag(c_idle.idle, TIF_FORK);
initial_gs = per_cpu_offset(cpu);
@@ -897,20 +903,8 @@ int __cpuinit native_cpu_up(unsigned int cpu)
per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
-#ifdef CONFIG_X86_32
- /* init low mem mapping */
- clone_pgd_range(swapper_pg_dir, swapper_pg_dir + KERNEL_PGD_BOUNDARY,
- min_t(unsigned long, KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
- flush_tlb_all();
- low_mappings = 1;
-
err = do_boot_cpu(apicid, cpu);
- zap_low_mappings(false);
- low_mappings = 0;
-#else
- err = do_boot_cpu(apicid, cpu);
-#endif
if (err) {
pr_debug("do_boot_cpu failed %d\n", err);
return -EIO;