[S390] hibernate: Do real CPU swap at resume time

Currently, when the physical resume CPU is not equal to the physical suspend
CPU, we swap the CPUs logically, by modifying the logical/physical CPU mapping.
This has two major drawbacks: First the change is visible from user space (e.g.
CPU sysfs files) and second it is hard to ensure that nowhere in the kernel
the physical CPU ID is stored before suspend.
To fix this, we now really swap the physical CPUs, if the resume CPU is not
the pysical suspend CPU. We restart the suspend CPU and stop the resume CPU
using SIGP restart and SIGP stop. If the suspend CPU is no longer available,
we write a message and load a disabled wait PSW.

Signed-off-by: Michael Holzheu <michael.holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/arch/s390/kernel/sclp.S b/arch/s390/kernel/sclp.S
index 20639dfe0c4..e27ca63076d 100644
--- a/arch/s390/kernel/sclp.S
+++ b/arch/s390/kernel/sclp.S
@@ -24,8 +24,6 @@ LC_EXT_INT_CODE		= 0x86			# addr of ext int code
 #   R3  = external interruption parameter if R2=0
 #
 
-.section ".init.text","ax"
-
 _sclp_wait_int:
         stm     %r6,%r15,24(%r15)               # save registers
         basr    %r13,0                          # get base register
@@ -318,9 +316,8 @@ _sclp_print_early:
         .long   _sclp_work_area
 .Lascebc:
         .long   _ascebc
-.previous
 
-.section ".init.data","a"
+.section .data,"aw",@progbits
         .balign 4096
 _sclp_work_area:
         .fill   4096