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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>
Patch-mainline: linux-mm @ Tue, 17 Apr 2018 16:33:13
[vinmenon@codeaurora.org: trivial merge conflict fixes]
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
[charante@codeaurora.org: merge conflict fixes]
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 Vinayak Menon
commit f9eb248e24
2 changed files with 7 additions and 2 deletions
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7
include/linux/mm.h
View file

@ -529,6 +529,11 @@ 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 = {};
@ -536,7 +541,7 @@ 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

@ -359,7 +359,7 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig)
if (new) {
*new = *orig;
INIT_LIST_HEAD(&new->anon_vma_chain);
INIT_VMA(new);
}
return new;
}