kernel.git/arch/s390/kernel/nmi.c, branch linux-4.10.y

s390/nmi: fix inline assembly constraints

2016-12-14T15:33:41Z

Add missing memory clobbers / barriers or use the Q constraint where possible to tell the compiler that the inline assemblies actually access memory and not only pointers to memory. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/nmi: improve revalidation of fpu / vector registers

2016-08-29T09:05:03Z

The machine check handler will do one of two things if the floating-point control, a floating point register or a vector register can not be revalidated: 1) if the PSW indicates user mode the process is terminated 2) if the PSW indicates kernel mode the system is stopped To unconditionally stop the system for 2) is incorrect. There are three possible outcomes if the floating-point control, a floating point register or a vector registers can not be revalidated: 1) The kernel is inside a kernel_fpu_begin/kernel_fpu_end block and needs the register. The system is stopped. 2) No active kernel_fpu_begin/kernel_fpu_end block and the CIF_CPU bit is not set. The user space process needs the register and is killed. 3) No active kernel_fpu_begin/kernel_fpu_end block and the CIF_FPU bit is set. Neither the kernel nor the user space process needs the lost register. Just revalidate it and continue. Signed-off-by: Martin Schwidefsky

s390/time: remove ETR support

2016-06-13T13:58:21Z

The External-Time-Reference (ETR) clock synchronization interface has been superseded by Server-Time-Protocol (STP). Remove the outdated ETR interface. Signed-off-by: Martin Schwidefsky

s390/nmi: reduce size of percpu variable

2015-10-27T08:33:57Z

Change the flag fields within struct mcck_struct to simple bit fields to reduce the size of the structure which is used as percpu variable. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/nmi: fix terminology

2015-10-27T08:33:56Z

According to the architecture registers are validated and not revalidated. So change comments and functions names to match. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/nmi: remove casts

2015-10-27T08:33:55Z

Remove all the casts to and from the machine check interruption code. This patch changes struct mci to a union, which contains an anonymous structure with the already known bits and in addition an unsigned long field, which contains the raw machine check interruption code. This allows to simply assign and decoce the interruption code value without the need for all those casts we had all the time. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/nmi: remove pointless error strings

2015-10-27T08:33:54Z

s390_handle_damage() has character string parameter which was used as a pointer to verbose error message. The hope was (a lot of years ago) when analyzing dumps that register R2 would still contain the pointer and therefore it would be rather easy to tell what went wrong. However gcc optimizes the strings away since a long time. And even if it wouldn't it is necessary to have a close look at the machine check interruption code to tell what's wrong. So remove the pointless error strings. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/fpu: split fpu-internal.h into fpu internals, api, and type headers

2015-10-16T07:41:12Z

Split the API and FPU type definitions into separate header files similar to "x86/fpu: Rename fpu-internal.h to fpu/internal.h" (78f7f1e54b). The new header files and their meaning are: asm/fpu/types.h: FPU related data types, needed for 'struct thread_struct' and 'struct task_struct'. asm/fpu/api.h: FPU related 'public' functions for other subsystems and device drivers. asm/fpu/internal.h: FPU internal functions mainly used to convert FPU register contents in signal handling. Signed-off-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky

s390/etr,stp: fix possible deadlock on machine check

2015-10-14T12:32:18Z

The first level machine check handler for etr and stp machine checks may call queue_work() while in nmi context. This may deadlock e.g. if the machine check happened when the interrupted context did hold a lock, that also will be acquired by queue_work(). Therefore split etr and stp machine check handling into first and second level handling. The second level handling will then issue the queue_work() call in process context which avoids the potential deadlock. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/nmi: initialize control register 0 earlier

2015-08-19T08:40:38Z

Change machine_check_init() to an early_initcall(). This makes sure it will be called before all other cpus are online and therfore saves us a lot of pointless smp_call_function() calls. The control register settings will be forwarded to the other cpus when they will be brought online. Signed-off-by: Heiko Carstens Reviewed-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky