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From: Heiko Carstens on 26 May 2010 12:40
From: Heiko Carstens <heiko.carstens(a)de.ibm.com>

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(a)de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky(a)de.ibm.com>
Cc: Suzuki Poulose <suzuki(a)in.ibm.com>
Cc: Alexey Dobriyan <adobriyan(a)gmail.com>
---
arch/s390/include/asm/mmu.h | 5 +++++
arch/s390/mm/vmem.c | 4 ----
mm/init-mm.c | 6 ++++++
3 files changed, 11 insertions(+), 4 deletions(-)

--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -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
--- 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++) {
--- a/mm/init-mm.c
+++ b/mm/init-mm.c
@@ -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)
};
--
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Prev: [PATCH] Typo in netdevice.h
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