Merge branch 'WIP.x86-pti.entry-for-linus' of git://git.kernel.org/pub/scm/linux...

[mirror_ubuntu-bionic-kernel.git] / arch / x86 / power / cpu.c

diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index 36a28eddb435e72d2abc5ffbdd1e78a46b56876e..a7d966964c6f20577c927cf5e618bc86b3331977 100644 (file)
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -152,17 +152,19 @@ static void do_fpu_end(void)
 static void fix_processor_context(void)
 {
        int cpu = smp_processor_id();
-       struct tss_struct *t = &per_cpu(cpu_tss, cpu);
 #ifdef CONFIG_X86_64
        struct desc_struct *desc = get_cpu_gdt_rw(cpu);
        tss_desc tss;
 #endif
-       set_tss_desc(cpu, t);   /*
-                                * This just modifies memory; should not be
-                                * necessary. But... This is necessary, because
-                                * 386 hardware has concept of busy TSS or some
-                                * similar stupidity.
-                                */
+
+       /*
+        * We need to reload TR, which requires that we change the
+        * GDT entry to indicate "available" first.
+        *
+        * XXX: This could probably all be replaced by a call to
+        * force_reload_TR().
+        */
+       set_tss_desc(cpu, &get_cpu_entry_area(cpu)->tss.x86_tss);
 
 #ifdef CONFIG_X86_64
        memcpy(&tss, &desc[GDT_ENTRY_TSS], sizeof(tss_desc));