[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>
diff --git a/arch/s390/kernel/sclp.S b/arch/s390/kernel/sclp.S
index 20639df..e27ca63 100644
--- a/arch/s390/kernel/sclp.S
+++ b/arch/s390/kernel/sclp.S
@@ -24,8 +24,6 @@
# 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 @@
.long _sclp_work_area
.Lascebc:
.long _ascebc
-.previous
-.section ".init.data","a"
+.section .data,"aw",@progbits
.balign 4096
_sclp_work_area:
.fill 4096