s390: fix kernel oops for CONFIG_MARCH_Z900=y builds
The LAST_BREAK macro in entry.S uses a different instruction sequence
for CONFIG_MARCH_Z900 builds. The branch target offset to skip the
store of the last breaking event address needs to take the different
length of the code block into account.
Fixes: f8fc82b47149e344 ("s390: move sys_call_table and last_break from thread_info to thread_struct")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 9e0291a..161f4e6 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -123,10 +123,11 @@
.macro LAST_BREAK scratch
srag \scratch,%r10,23
- jz .+10
#ifdef CONFIG_HAVE_MARCH_Z990_FEATURES
+ jz .+10
stg %r10,__TASK_thread+__THREAD_last_break(%r12)
#else
+ jz .+14
lghi \scratch,__TASK_thread
stg %r10,__THREAD_last_break(\scratch,%r12)
#endif
