sh: Support kernel stacks smaller than a page.

[linux-2.6-omap-h63xx.git] / arch / sh / mm / init.c

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 31211bfdc6d8481f8d8e02ff918d88e40a972fb0..2a53943924b2c99479e3c748a31acf9db45494d1 100644 (file)
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -265,6 +265,35 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 }
 #endif
 
+#if THREAD_SHIFT < PAGE_SHIFT
+static struct kmem_cache *thread_info_cache;
+
+struct thread_info *alloc_thread_info(struct task_struct *tsk)
+{
+       struct thread_info *ti;
+
+       ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
+       if (unlikely(ti == NULL))
+               return NULL;
+#ifdef CONFIG_DEBUG_STACK_USAGE
+       memset(ti, 0, THREAD_SIZE);
+#endif
+       return ti;
+}
+
+void free_thread_info(struct thread_info *ti)
+{
+       kmem_cache_free(thread_info_cache, ti);
+}
+
+void thread_info_cache_init(void)
+{
+       thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
+                                             THREAD_SIZE, 0, NULL);
+       BUG_ON(thread_info_cache == NULL);
+}
+#endif /* THREAD_SHIFT < PAGE_SHIFT */
+
 #ifdef CONFIG_MEMORY_HOTPLUG
 int arch_add_memory(int nid, u64 start, u64 size)
 {