Commit 61aaef51 authored Nov 25, 2016 by Martin Schwidefsky

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: f8fc82b4 ("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>

parent 5c5afd02

arch/s390/kernel/entry.S

+2 −1

Original line number	Diff line number	Diff line
		@@ -123,10 +123,11 @@ _PIF_WORK = (_PIF_PER_TRAP)

		.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