BMC/Intel-BMC/linux.git/arch/s390/kernel/entry.S, branch dev-4.10

s390: remove unused labels from entry.S

2016-12-12T11:04:26+00:00

Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390: fix machine check panic stack switch

2016-12-07T06:22:13+00:00

For system damage machine checks or machine checks due to invalid PSW fields the system will be stopped. In order to get an oops message out before killing the system the machine check handler branches to .Lmcck_panic, switches to the panic stack and then does the usual machine check handling. The switch to the panic stack is incomplete, the stack pointer in %r15 is replaced, but the pt_regs pointer in %r11 is not. The result is a program check which will kill the system in a slightly different way. Signed-off-by: Martin Schwidefsky

s390: fix kernel oops for CONFIG_MARCH_Z900=y builds

2016-11-25T09:07:55+00:00

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 Signed-off-by: Martin Schwidefsky

s390/thread_info: get rid of THREAD_ORDER define

2016-11-23T15:02:21+00:00

We have the s390 specific THREAD_ORDER define and the THREAD_SIZE_ORDER define which is also used in common code. Both have exactly the same semantics. Therefore get rid of THREAD_ORDER and always use THREAD_SIZE_ORDER instead. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390: move sys_call_table and last_break from thread_info to thread_struct

2016-11-15T15:48:20+00:00

Move the last two architecture specific fields from the thread_info structure to the thread_struct. All that is left in thread_info is the flags field. Reviewed-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390: move thread_info into task_struct

2016-11-11T15:37:41+00:00

This is the s390 variant of commit 15f4eae70d36 ("x86: Move thread_info into task_struct"). Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/preempt: move preempt_count to the lowcore

2016-11-11T15:37:40+00:00

Convert s390 to use a field in the struct lowcore for the CPU preemption count. It is a bit cheaper to access a lowcore field compared to a thread_info variable and it removes the depencency on a task related structure. bloat-o-meter on the vmlinux image for the default configuration (CONFIG_PREEMPT_NONE=y) reports a small reduction in text size: add/remove: 0/0 grow/shrink: 18/578 up/down: 228/-5448 (-5220) A larger improvement is achieved with the default configuration but with CONFIG_PREEMPT=y and CONFIG_DEBUG_PREEMPT=n: add/remove: 2/6 grow/shrink: 59/4477 up/down: 1618/-228762 (-227144) Reviewed-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390: move exports to definitions

2016-08-08T03:47:20+00:00

Acked-by: Heiko Carstens Signed-off-by: Al Viro

s390: have unique symbol for __switch_to address

2016-07-04T07:25:22+00:00

After linking there are several symbols for the same address that the __switch_to symbol points to. E.g.: 000000000089b9c0 T __kprobes_text_start 000000000089b9c0 T __lock_text_end 000000000089b9c0 T __lock_text_start 000000000089b9c0 T __sched_text_end 000000000089b9c0 T __switch_to When disassembling with "objdump -d" this results in a missing __switch_to function. It would be named __kprobes_text_start instead. To unconfuse objdump add a nop in front of the kprobes text section. That way __switch_to appears again. Obviously this solution is sort of a hack, since it also depends on link order if this works or not. However it is the best I can come up with for now. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390: remove pointless load within __switch_to

2016-06-28T07:32:40+00:00

Remove a leftover from the code that transferred a couple of TIF bits from the previous task to the next task. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky