1 files changed, 54 insertions, 0 deletions

diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index 077e06e..81add9b 100644
--- a/arch/sh/kernel/process.c
+++ b/arch/sh/kernel/process.c
@@ -2,6 +2,32 @@
 #include <linux/kernel.h>
 #include <linux/sched.h>
 
+struct kmem_cache *task_xstate_cachep = NULL;
+unsigned int xstate_size;
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+	*dst = *src;
+
+	if (src->thread.xstate) {
+		dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
+						      GFP_KERNEL);
+		if (!dst->thread.xstate)
+			return -ENOMEM;
+		memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
+	}
+
+	return 0;
+}
+
+void free_thread_xstate(struct task_struct *tsk)
+{
+	if (tsk->thread.xstate) {
+		kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
+		tsk->thread.xstate = NULL;
+	}
+}
+
 #if THREAD_SHIFT < PAGE_SHIFT
 static struct kmem_cache *thread_info_cache;
 
@@ -20,6 +46,7 @@ struct thread_info *alloc_thread_info(struct task_struct *tsk)
 
 void free_thread_info(struct thread_info *ti)
 {
+	free_thread_xstate(ti->task);
 	kmem_cache_free(thread_info_cache, ti);
 }
 
@@ -41,6 +68,33 @@ struct thread_info *alloc_thread_info(struct task_struct *tsk)
 
 void free_thread_info(struct thread_info *ti)
 {
+	free_thread_xstate(ti->task);
 	free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
 }
 #endif /* THREAD_SHIFT < PAGE_SHIFT */
+
+void arch_task_cache_init(void)
+{
+	if (!xstate_size)
+		return;
+
+	task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
+					       __alignof__(union thread_xstate),
+					       SLAB_PANIC | SLAB_NOTRACK, NULL);
+}
+
+#ifdef CONFIG_SH_FPU_EMU
+# define HAVE_SOFTFP	1
+#else
+# define HAVE_SOFTFP	0
+#endif
+
+void init_thread_xstate(void)
+{
+	if (boot_cpu_data.flags & CPU_HAS_FPU)
+		xstate_size = sizeof(struct sh_fpu_hard_struct);
+	else if (HAVE_SOFTFP)
+		xstate_size = sizeof(struct sh_fpu_soft_struct);
+	else
+		xstate_size = 0;
+}