[PATCH] uml: Fix sysrq-r support for skas mode

The old code had the IP and SP coming from the registers in the thread
struct, which are completely wrong since those are the userspace
registers.  This fixes that by pulling the correct values from the
jmp_buf in which the kernel state of each thread is stored.

Signed-off-by: Allan Graves <allan.graves@oracle.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 7 deletions

diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
index f80850091e79..b331e970002f 100644
--- a/arch/um/kernel/sysrq.c
+++ b/arch/um/kernel/sysrq.c
@@ -62,13 +62,7 @@ void show_stack(struct task_struct *task, unsigned long *esp)
 
         if (esp == NULL) {
                 if (task != current && task != NULL) {
-                        /* XXX: Isn't this bogus? I.e. isn't this the
-                         * *userspace* stack of this task? If not so, use this
-                         * even when task == current (as in i386).
-                         */
                         esp = (unsigned long *) KSTK_ESP(task);
-                        /* Which one? No actual difference - just coding style.*/
-                        //esp = (unsigned long *) PT_REGS_IP(&task->thread.regs);
                 } else {
                         esp = (unsigned long *) &esp;
                 }
@@ -84,5 +78,5 @@ void show_stack(struct task_struct *task, unsigned long *esp)
         }
 
         printk("Call Trace: \n");
-        show_trace(current, esp);
+        show_trace(task, esp);
 }