sh: Support kernel stacks smaller than a page.

[linux-2.6-omap-h63xx.git] / arch / sh / include / asm / thread_info.h

diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h
index 0a894cafb1ddcbc43b40303b62db4678d272ea72..f09ac4806294007a883b0a472ed2d6654a7ef19f 100644 (file)
--- a/arch/sh/include/asm/thread_info.h
+++ b/arch/sh/include/asm/thread_info.h
@@ -33,20 +33,12 @@ struct thread_info {
 #define PREEMPT_ACTIVE         0x10000000
 
 #if defined(CONFIG_4KSTACKS)
-#define THREAD_SIZE_ORDER      (0)
-#elif defined(CONFIG_PAGE_SIZE_4KB)
-#define THREAD_SIZE_ORDER      (1)
-#elif defined(CONFIG_PAGE_SIZE_8KB)
-#define THREAD_SIZE_ORDER      (1)
-#elif defined(CONFIG_PAGE_SIZE_16KB)
-#define THREAD_SIZE_ORDER      (0)
-#elif defined(CONFIG_PAGE_SIZE_64KB)
-#define THREAD_SIZE_ORDER      (0)
+#define THREAD_SHIFT   12
 #else
-#error "Unknown thread size"
+#define THREAD_SHIFT   13
 #endif
 
-#define THREAD_SIZE    (PAGE_SIZE << THREAD_SIZE_ORDER)
+#define THREAD_SIZE    (1 << THREAD_SHIFT)
 #define STACK_WARN     (THREAD_SIZE >> 3)
 
 /*
@@ -94,15 +86,19 @@ static inline struct thread_info *current_thread_info(void)
        return ti;
 }
 
+/* thread information allocation */
+#if THREAD_SHIFT >= PAGE_SHIFT
+
+#define THREAD_SIZE_ORDER      (THREAD_SHIFT - PAGE_SHIFT)
+
+#else /* THREAD_SHIFT < PAGE_SHIFT */
+
 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
 
-/* thread information allocation */
-#ifdef CONFIG_DEBUG_STACK_USAGE
-#define alloc_thread_info(ti)  kzalloc(THREAD_SIZE, GFP_KERNEL)
-#else
-#define alloc_thread_info(ti)  kmalloc(THREAD_SIZE, GFP_KERNEL)
-#endif
-#define free_thread_info(ti)   kfree(ti)
+extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
+extern void free_thread_info(struct thread_info *ti);
+ 
+#endif /* THREAD_SHIFT < PAGE_SHIFT */
 
 #endif /* __ASSEMBLY__ */