parisc: Move thread_info into task struct

This implements the CONFIG_THREAD_INFO_IN_TASK option.

With this change:
- before thread_info was part of the stack and located at the beginning of the stack
- now the thread_info struct is moved and located inside the task_struct structure
- the stack is allocated and handled like the major other platforms
- drop the cpu field of thread_info and use instead the one in task_struct

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sven Schnelle <svens@stackframe.org>

1 files changed, 4 insertions, 6 deletions

diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index 34676658c040..42acc3b52017 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -14,6 +14,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/sort.h>
+#include <linux/sched/task_stack.h>
 
 #include <linux/uaccess.h>
 #include <asm/assembly.h>
@@ -299,12 +300,9 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
 			info->prev_sp = sp - 64;
 			info->prev_ip = 0;
 
-			/* The stack is at the end inside the thread_union
-			 * struct. If we reach data, we have reached the
-			 * beginning of the stack and should stop unwinding. */
-			if (info->prev_sp >= (unsigned long) task_thread_info(info->t) &&
-			    info->prev_sp < ((unsigned long) task_thread_info(info->t)
-						+ THREAD_SZ_ALGN)) {
+			/* Check if stack is inside kernel stack area */
+			if ((info->prev_sp - (unsigned long) task_stack_page(info->t))
+					>= THREAD_SIZE) {
 				info->prev_sp = 0;
 				break;
 			}