Merging upstream version 4.19.304.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 15 insertions, 10 deletions

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 8783d065f..2e4f6a1eb 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -96,6 +96,17 @@ DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
 DEFINE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
 EXPORT_PER_CPU_SYMBOL(cpu_info);
 
+struct mwait_cpu_dead {
+	unsigned int	control;
+	unsigned int	status;
+};
+
+/*
+ * Cache line aligned data for mwait_play_dead(). Separate on purpose so
+ * that it's unlikely to be touched by other CPUs.
+ */
+static DEFINE_PER_CPU_ALIGNED(struct mwait_cpu_dead, mwait_cpu_dead);
+
 /* Logical package management. We might want to allocate that dynamically */
 unsigned int __max_logical_packages __read_mostly;
 EXPORT_SYMBOL(__max_logical_packages);
@@ -231,6 +242,7 @@ static void notrace start_secondary(void *unused)
 #endif
 	load_current_idt();
 	cpu_init();
+	fpu__init_cpu();
 	x86_cpuinit.early_percpu_clock_init();
 	preempt_disable();
 	smp_callin();
@@ -1594,10 +1606,10 @@ static bool wakeup_cpu0(void)
  */
 static inline void mwait_play_dead(void)
 {
+	struct mwait_cpu_dead *md = this_cpu_ptr(&mwait_cpu_dead);
 	unsigned int eax, ebx, ecx, edx;
 	unsigned int highest_cstate = 0;
 	unsigned int highest_subcstate = 0;
-	void *mwait_ptr;
 	int i;
 
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
@@ -1631,13 +1643,6 @@ static inline void mwait_play_dead(void)
 			(highest_subcstate - 1);
 	}
 
-	/*
-	 * This should be a memory location in a cache line which is
-	 * unlikely to be touched by other processors.  The actual
-	 * content is immaterial as it is not actually modified in any way.
-	 */
-	mwait_ptr = &current_thread_info()->flags;
-
 	wbinvd();
 
 	while (1) {
@@ -1649,9 +1654,9 @@ static inline void mwait_play_dead(void)
 		 * case where we return around the loop.
 		 */
 		mb();
-		clflush(mwait_ptr);
+		clflush(md);
 		mb();
-		__monitor(mwait_ptr, 0, 0);
+		__monitor(md, 0, 0);
 		mb();
 		__mwait(eax, 0);
 		/*