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mm: provide init_mm mm_context initializer

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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>
This commit is contained in:
Heiko Carstens 2010-08-09 17:18:28 -07:00 committed by Linus Torvalds
parent e7d8634079
commit a1b200e27c
3 changed files with 11 additions and 4 deletions
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5
arch/s390/include/asm/mmu.h
View file

@ -13,4 +13,9 @@ typedef struct {
int alloc_pgste; /* cloned contexts will have extended page tables */
} mm_context_t;
#define INIT_MM_CONTEXT(name) \
.context.list_lock = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
.context.crst_list = LIST_HEAD_INIT(name.context.crst_list), \
.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list),
#endif

4
arch/s390/mm/vmem.c
View file

@ -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++) {

6
mm/init-mm.c
View file

@ -7,6 +7,11 @@
#include <asm/atomic.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
#ifndef INIT_MM_CONTEXT
#define INIT_MM_CONTEXT(name)
#endif
struct mm_struct init_mm = {
.mm_rb = RB_ROOT,
@ -17,4 +22,5 @@ struct mm_struct init_mm = {
.page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
.cpu_vm_mask = CPU_MASK_ALL,
INIT_MM_CONTEXT(init_mm)
};