mm: provide init_mm mm_context initializer

Provide an INIT_MM_CONTEXT intializer macro which can be used to
statically initialize mm_struct:mm_context of init_mm.  This way we can
get rid of code which will do the initialization at run time (on s390).

In addition the current code can be found at a place where it is not
expected.  So let's have a common initializer which architectures
can use if needed.

This is based on a patch from Suzuki Poulose.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Suzuki Poulose <suzuki@in.ibm.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 4 deletions

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 90165e7ca04e..34c43f23b28c 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -332,10 +332,6 @@ void __init vmem_map_init(void)
         unsigned long start, end;
         int i;
 
-        spin_lock_init(&init_mm.context.list_lock);
-        INIT_LIST_HEAD(&init_mm.context.crst_list);
-        INIT_LIST_HEAD(&init_mm.context.pgtable_list);
-        init_mm.context.noexec = 0;
         ro_start = ((unsigned long)&_stext) & PAGE_MASK;
         ro_end = PFN_ALIGN((unsigned long)&_eshared);
         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {