powerpc: make process.c suitable for both 32-bit and 64-bit

Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/init_task.c

+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/init_task.h>
+#include <linux/fs.h>
+#include <linux/mqueue.h>
+#include <asm/uaccess.h>
+
+static struct fs_struct init_fs = INIT_FS;
+static struct files_struct init_files = INIT_FILES;
+static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
+static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
+struct mm_struct init_mm = INIT_MM(init_mm);
+
+EXPORT_SYMBOL(init_mm);
+
+/*
+ * Initial thread structure.
+ *
+ * We need to make sure that this is 16384-byte aligned due to the
+ * way process stacks are handled. This is done by having a special
+ * "init_task" linker map entry..
+ */
+union thread_union init_thread_union 
+	__attribute__((__section__(".data.init_task"))) =
+		{ INIT_THREAD_INFO(init_task) };
+
+/*
+ * Initial task structure.
+ *
+ * All other task structs will be allocated on slabs in fork.c
+ */
+struct task_struct init_task = INIT_TASK(init_task);
+
+EXPORT_SYMBOL(init_task);

include/asm-powerpc/elf.h

@@ -214,10 +214,8 @@ extern int dump_task_fpu(struct task_struct *, elf_fpregset_t *);
    but it's not easy, and we've already done it here.  */
 # define ELF_HWCAP	(cur_cpu_spec->cpu_user_features)
 #ifdef __powerpc64__
-# define ELF_PLAT_INIT(_r, load_addr)	do { \
-	memset(_r->gpr, 0, sizeof(_r->gpr)); \
-	_r->ctr = _r->link = _r->xer = _r->ccr = 0; \
-	_r->gpr[2] = load_addr; \
+# define ELF_PLAT_INIT(_r, load_addr)	do {	\
+	_r->gpr[2] = load_addr; 		\
 } while (0)
 #endif /* __powerpc64__ */