s390/dump: cleanup CPU save area handling

Introduce save_area_alloc(), save_area_boot_cpu(), save_area_add_regs()
and save_area_add_vxrs to deal with storing the CPU state in case of a
system dump. Remove struct save_area and save_area_ext, and create a new
struct save_area as a local definition to arch/s390/kernel/crash_dump.c.
Copy each individual field from the hardware status area to the save area,
storing the minimum of required data.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index bed191a39c5b..5043ecfa1fbc 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -117,18 +117,17 @@ int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
 
 static int __init init_cpu_info(void)
 {
-	struct save_area_ext *sa_ext;
+	struct save_area *sa;
 
 	/* get info for boot cpu from lowcore, stored in the HSA */
-
-	sa_ext = dump_save_areas.areas[0];
-	if (!sa_ext)
+	sa = save_area_boot_cpu();
+	if (!sa)
 		return -ENOMEM;
-	if (memcpy_hsa_kernel(&sa_ext->sa, __LC_FPREGS_SAVE_AREA,
-			      sizeof(struct save_area)) < 0) {
+	if (memcpy_hsa_kernel(hsa_buf, __LC_FPREGS_SAVE_AREA, 512) < 0) {
 		TRACE("could not copy from HSA\n");
 		return -EIO;
 	}
+	save_area_add_regs(sa, hsa_buf); /* vx registers are saved in smp.c */
 	return 0;
 }