sh: Always provide thread_info allocators.

Presently the thread_info allocators are special cased, depending on
THREAD_SHIFT < PAGE_SHIFT. This provides a sensible definition for them
regardless of configuration, in preparation for extended CPU state.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 49 insertions, 2 deletions

diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index 5bec10c8bd7..379053c008f 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -13,8 +13,8 @@ CFLAGS_REMOVE_return_address.o = -pg
 
 obj-y	:= debugtraps.o dma-nommu.o dumpstack.o 			\
 	   idle.o io.o io_generic.o irq.o				\
-	   irq_$(BITS).o machvec.o nmi_debug.o process_$(BITS).o 	\
-	   ptrace_$(BITS).o return_address.o				\
+	   irq_$(BITS).o machvec.o nmi_debug.o process.o		\
+	   process_$(BITS).o ptrace_$(BITS).o return_address.o		\
 	   setup.o signal_$(BITS).o sys_sh.o sys_sh$(BITS).o		\
 	   syscalls_$(BITS).o time.o topology.o traps.o			\
 	   traps_$(BITS).o unwinder.o
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
new file mode 100644
index 00000000000..b2bda83baee
--- /dev/null
+++ b/arch/sh/kernel/process.c
@@ -0,0 +1,47 @@
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+
+#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);
+}
+#else
+struct thread_info *alloc_thread_info(struct task_struct *tsk)
+{
+#ifdef CONFIG_DEBUG_STACK_USAGE
+	gfp_t mask = GFP_KERNEL | __GFP_ZERO;
+#else
+	gfp_t mask = GFP_KERNEL;
+#endif
+	return (struct thread_info *)__get_free_pages(mask, THREAD_SIZE_ORDER);
+}
+
+void free_thread_info(struct thread_info *ti)
+{
+	free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
+}
+#endif /* THREAD_SHIFT < PAGE_SHIFT */