[PATCH] s390: improved machine check handling
Improved machine check handling. Kernel is now able to receive machine checks
while in kernel mode (system call, interrupt and program check handling).
Also register validation is now performed.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 93c71fe..50c3350 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -773,13 +773,24 @@
*(lowcore_ptr[i]) = S390_lowcore;
lowcore_ptr[i]->async_stack = stack + (ASYNC_SIZE);
-#ifdef CONFIG_CHECK_STACK
stack = __get_free_pages(GFP_KERNEL,0);
if (stack == 0ULL)
panic("smp_boot_cpus failed to allocate memory\n");
lowcore_ptr[i]->panic_stack = stack + (PAGE_SIZE);
+#ifndef __s390x__
+ if (MACHINE_HAS_IEEE) {
+ lowcore_ptr[i]->extended_save_area_addr =
+ (__u32) __get_free_pages(GFP_KERNEL,0);
+ if (lowcore_ptr[i]->extended_save_area_addr == 0)
+ panic("smp_boot_cpus failed to "
+ "allocate memory\n");
+ }
#endif
}
+#ifndef __s390x__
+ if (MACHINE_HAS_IEEE)
+ ctl_set_bit(14, 29); /* enable extended save area */
+#endif
set_prefix((u32)(unsigned long) lowcore_ptr[smp_processor_id()]);
for_each_cpu(cpu)