sw64: fix THREAD_INFO_IN_TASK support

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6ILGG

--------------------------------

Since CONFIG_THREAD_INFO_IN_TASK has been activated, init_thread_info
and __current_thread_info are removed, and compile errors occur if
CONFIG_DYNAMIC_FTRACE=y or CONFIG_RELOCATABLE=y.

This patch replaces init_thread_info with task_thread_info(&init_task)
and fixes the method to relocate task pointer and stack pointer to new
kernel image for kaslr.
Signed-off-by: NHe Chuyue <hechuyue@wxiat.com>
Reviewed-by: NHe Sheng <hesheng@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>

arch/sw_64/kernel/ftrace.c

@@ -100,10 +100,12 @@ void arch_ftrace_update_code(int command)
 
 int __init ftrace_dyn_arch_init(void)
 {
-	init_thread_info.dyn_ftrace_addr = FTRACE_ADDR;
+	struct thread_info *ti = task_thread_info(&init_task);
+
+	ti->dyn_ftrace_addr = FTRACE_ADDR;
 
 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
-	init_thread_info.dyn_ftrace_regs_addr = FTRACE_REGS_ADDR;
+	ti->dyn_ftrace_regs_addr = FTRACE_REGS_ADDR;
 #endif
 	return 0;
 }

arch/sw_64/kernel/head.S

@@ -40,8 +40,10 @@ __start:
 	call	$26, relocate_kernel
 	ldl	$29, 0($30)
 	addl	$29, $0, $29
+	addl	$8, $0, $8
+	ldi	$30, 8($30)
 	/* Repoint the sp into the new kernel image */
-	ldi	$30, ASM_THREAD_SIZE($8)
+	addl	$30, $0, $30
 #endif
 	/* ... and then we can start the kernel.  */
 	call	$26, sw64_start_kernel

arch/sw_64/kernel/relocate.c

@@ -239,9 +239,6 @@ unsigned int __init relocate_kernel(void)
 		if (plat_post_relocation(offset))
 			goto out;
 
-		/* The current thread is now within the relocated image */
-		__current_thread_info = RELOCATED(&init_thread_union);
-
 		/* Return the new kernel's offset */
 		return offset;
 	}