The patch titled
Subject: ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2
has been added to the -mm tree. Its filename is
ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2.patch
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------------------------------------------------------
From: Jane Chu <jane.chu@xxxxxxxxxx>
Subject: ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2
relocate comment
Link: http://lkml.kernel.org/r/20180731044831.26036-1-jane.chu@xxxxxxxxxx
Signed-off-by: Jane Chu <jane.chu@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN include/linux/mm.h~ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2 include/linux/mm.h
--- a/include/linux/mm.h~ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2
+++ a/include/linux/mm.h
@@ -389,13 +389,6 @@ enum page_entry_size {
* These are the virtual MM functions - opening of an area, closing and
* unmapping it (needed to keep files on disk up-to-date etc), pointer
* to the functions called when a no-page or a wp-page exception occurs.
- *
- * Note, when a new function is introduced to vm_operations_struct and
- * added to hugetlb_vm_ops, please consider adding the function to
- * shm_vm_ops. This is because under System V memory model, though
- * mappings created via shmget/shmat with "huge page" specified are
- * backed by hugetlbfs files, their original vm_ops are overwritten with
- * shm_vm_ops.
*/
struct vm_operations_struct {
void (*open)(struct vm_area_struct * area);
diff -puN mm/hugetlb.c~ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2 mm/hugetlb.c
--- a/mm/hugetlb.c~ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2
+++ a/mm/hugetlb.c
@@ -3167,6 +3167,13 @@ static vm_fault_t hugetlb_vm_op_fault(st
return 0;
}
+/*
+ * When a new function is introduced to vm_operations_struct and added
+ * to hugetlb_vm_ops, please consider adding the function to shm_vm_ops.
+ * This is because under System V memory model, mappings created via
+ * shmget/shmat with "huge page" specified are backed by hugetlbfs files,
+ * their original vm_ops are overwritten with shm_vm_ops.
+ */
const struct vm_operations_struct hugetlb_vm_ops = {
.fault = hugetlb_vm_op_fault,
.open = hugetlb_vm_op_open,
_
Patches currently in -mm which might be from jane.chu@xxxxxxxxxx are
ipc-shmc-add-pagesize-function-to-shm_vm_ops.patch
ipc-shmc-add-pagesize-function-to-shm_vm_ops-v2.patch
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