Merge branch 'percpu-for-linus' into percpu-for-next

Conflicts:
	arch/sparc/kernel/smp_64.c
	arch/x86/kernel/cpu/perf_counter.c
	arch/x86/kernel/setup_percpu.c
	drivers/cpufreq/cpufreq_ondemand.c
	mm/percpu.c

Conflicts in core and arch percpu codes are mostly from commit
ed78e1e078dd44249f88b1dd8c76dafb39567161 which substituted many
num_possible_cpus() with nr_cpu_ids.  As for-next branch has moved all
the first chunk allocators into mm/percpu.c, the changes are moved
from arch code to mm/percpu.c.

Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 24 insertions, 12 deletions

diff --git a/arch/s390/power/swsusp.c b/arch/s390/power/swsusp.c
index e6a4fe9f5f24..bd1f5c6b0b8c 100644
--- a/arch/s390/power/swsusp.c
+++ b/arch/s390/power/swsusp.c
@@ -7,24 +7,36 @@
  *
  */
 
+#include <asm/system.h>
 
-/*
- * save CPU registers before creating a hibernation image and before
- * restoring the memory state from it
- */
 void save_processor_state(void)
 {
-        /* implentation contained in the
-         * swsusp_arch_suspend function
+        /* swsusp_arch_suspend() actually saves all cpu register contents.
+         * Machine checks must be disabled since swsusp_arch_suspend() stores
+         * register contents to their lowcore save areas. That's the same
+         * place where register contents on machine checks would be saved.
+         * To avoid register corruption disable machine checks.
+         * We must also disable machine checks in the new psw mask for
+         * program checks, since swsusp_arch_suspend() may generate program
+         * checks. Disabling machine checks for all other new psw masks is
+         * just paranoia.
          */
+        local_mcck_disable();
+        /* Disable lowcore protection */
+        __ctl_clear_bit(0,28);
+        S390_lowcore.external_new_psw.mask &= ~PSW_MASK_MCHECK;
+        S390_lowcore.svc_new_psw.mask &= ~PSW_MASK_MCHECK;
+        S390_lowcore.io_new_psw.mask &= ~PSW_MASK_MCHECK;
+        S390_lowcore.program_new_psw.mask &= ~PSW_MASK_MCHECK;
 }
 
-/*
- * restore the contents of CPU registers
- */
 void restore_processor_state(void)
 {
-        /* implentation contained in the
-         * swsusp_arch_resume function
-         */
+        S390_lowcore.external_new_psw.mask |= PSW_MASK_MCHECK;
+        S390_lowcore.svc_new_psw.mask |= PSW_MASK_MCHECK;
+        S390_lowcore.io_new_psw.mask |= PSW_MASK_MCHECK;
+        S390_lowcore.program_new_psw.mask |= PSW_MASK_MCHECK;
+        /* Enable lowcore protection */
+        __ctl_set_bit(0,28);
+        local_mcck_enable();
 }