s390/percpu: Get rid of ARCH_MODULE_NEEDS_WEAK_PER_CPU

Since the rework of the kernel virtual address space [1] the module area
and the kernel image are within the same 4GB area. Therefore there is no
need for the weak per cpu workaround for modules anymore. Remove it.

[1] commit c98d2ec ("s390/mm: Uncouple physical vs virtual address spaces")

Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Author: hcahca

arch/s390/Kconfig

@@ -140,7 +140,6 @@ config S390
 	select ARCH_INLINE_WRITE_UNLOCK_IRQ
 	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 	select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
-	select ARCH_MODULE_NEEDS_WEAK_PER_CPU
 	select ARCH_STACKWALK
 	select ARCH_SUPPORTS_ATOMIC_RMW
 	select ARCH_SUPPORTS_DEBUG_PAGEALLOC

arch/s390/include/asm/percpu.h

@@ -12,14 +12,6 @@
  */
 #define __my_cpu_offset get_lowcore()->percpu_offset
 
-/*
- * For 64 bit module code, the module may be more than 4G above the
- * per cpu area, use weak definitions to force the compiler to
- * generate external references.
- * Therefore, we have enabled CONFIG_ARCH_MODULE_NEEDS_WEAK_PER_CPU
- * in the Kconfig.
- */
-
 /*
  * We use a compare-and-swap loop since that uses less cpu cycles than
  * disabling and enabling interrupts like the generic variant would do.

include/linux/percpu-defs.h

@@ -52,7 +52,7 @@
 	__section(".discard") __attribute__((unused))
 
 /*
- * s390 and alpha modules require percpu variables to be defined as
+ * alpha modules require percpu variables to be defined as
  * weak to force the compiler to generate GOT based external
  * references for them.  This is necessary because percpu sections
  * will be located outside of the usually addressable area.