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FROMLIST: mm: introduce INIT_VMA()

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Some VMA struct fields need to be initialized once the VMA structure is
allocated.
Currently this only concerns anon_vma_chain field but some other will be
added to support the speculative page fault.

Instead of spreading the initialization calls all over the code, let's
introduce a dedicated inline function.

Change-Id: I9f6b29dc74055354318b548e2b6b22c37d4c61bb
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Link: https://lore.kernel.org/lkml/1523975611-15978-8-git-send-email-ldufour@linux.vnet.ibm.com/
Bug: 161210518
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
This commit is contained in:
Laurent Dufour
2018-04-17 16:33:13 +02:00
committed by Suren Baghdasaryan
parent 5835d87162
commit 0076600734
2 changed files with 7 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/mm.h
View File

@@ -625,6 +625,11 @@ struct vm_operations_struct {
unsigned long addr);
};
static inline void INIT_VMA(struct vm_area_struct *vma)
{
INIT_LIST_HEAD(&vma->anon_vma_chain);
}
static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm)
{
static const struct vm_operations_struct dummy_vm_ops = {};
@@ -632,7 +637,7 @@ static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm)
memset(vma, 0, sizeof(*vma));
vma->vm_mm = mm;
vma->vm_ops = &dummy_vm_ops;
INIT_LIST_HEAD(&vma->anon_vma_chain);
INIT_VMA(vma);
}
static inline void vma_set_anonymous(struct vm_area_struct *vma)

2
kernel/fork.c
View File

@@ -365,7 +365,7 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig)
* will be reinitialized.
*/
*new = data_race(*orig);
INIT_LIST_HEAD(&new->anon_vma_chain);
INIT_VMA(new);
new->vm_next = new->vm_prev = NULL;
}
return new;