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s390: fix kernel oops for CONFIG_MARCH_Z900=y builds

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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: f8fc82b471 ("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>
This commit is contained in:
Martin Schwidefsky 2016-11-25 09:53:42 +01:00
parent 5c5afd0201
commit 61aaef51cc
1 changed files with 2 additions and 1 deletions
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3
arch/s390/kernel/entry.S
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@ -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