From: Lorenzo Stoakes <lstoakes@gmail.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>
Cc: "=Liam R . Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>,
linux-fsdevel@vger.kernel.org,
Lorenzo Stoakes <lstoakes@gmail.com>
Subject: [PATCH v2 3/5] mm: make vma_merge() and split_vma() internal
Date: Mon, 9 Oct 2023 21:53:18 +0100 [thread overview]
Message-ID: <31d2c79f7a3bca03d4a4c95e98d9a27cb1f99bf1.1696884493.git.lstoakes@gmail.com> (raw)
In-Reply-To: <cover.1696884493.git.lstoakes@gmail.com>
Now the common pattern of - attempting a merge via vma_merge() and should
this fail splitting VMAs via split_vma() - has been abstracted, the former
can be placed into mm/internal.h and the latter made static.
In addition, the split_vma() nommu variant also need not be exported.
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
---
include/linux/mm.h | 9 ---------
mm/internal.h | 9 +++++++++
mm/mmap.c | 8 ++++----
mm/nommu.c | 4 ++--
4 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 83ee1f35febe..74d7547ffb70 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3237,16 +3237,7 @@ extern int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma,
struct vm_area_struct *next);
extern int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma,
unsigned long start, unsigned long end, pgoff_t pgoff);
-extern struct vm_area_struct *vma_merge(struct vma_iterator *vmi,
- struct mm_struct *, struct vm_area_struct *prev, unsigned long addr,
- unsigned long end, unsigned long vm_flags, struct anon_vma *,
- struct file *, pgoff_t, struct mempolicy *, struct vm_userfaultfd_ctx,
- struct anon_vma_name *);
extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
-extern int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *,
- unsigned long addr, int new_below);
-extern int split_vma(struct vma_iterator *vmi, struct vm_area_struct *,
- unsigned long addr, int new_below);
extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
extern void unlink_file_vma(struct vm_area_struct *);
extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
diff --git a/mm/internal.h b/mm/internal.h
index 3a72975425bb..ddaeb9f2d9d7 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1011,6 +1011,15 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmd,
unsigned int flags);
+/*
+ * mm/mmap.c
+ */
+struct vm_area_struct *vma_merge(struct vma_iterator *vmi,
+ struct mm_struct *, struct vm_area_struct *prev, unsigned long addr,
+ unsigned long end, unsigned long vm_flags, struct anon_vma *,
+ struct file *, pgoff_t, struct mempolicy *, struct vm_userfaultfd_ctx,
+ struct anon_vma_name *);
+
enum {
/* mark page accessed */
FOLL_TOUCH = 1 << 16,
diff --git a/mm/mmap.c b/mm/mmap.c
index 22d968affc07..17c0dcfb1527 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2346,8 +2346,8 @@ static void unmap_region(struct mm_struct *mm, struct ma_state *mas,
* has already been checked or doesn't make sense to fail.
* VMA Iterator will point to the end VMA.
*/
-int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
- unsigned long addr, int new_below)
+static int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
+ unsigned long addr, int new_below)
{
struct vma_prepare vp;
struct vm_area_struct *new;
@@ -2428,8 +2428,8 @@ int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
* Split a vma into two pieces at address 'addr', a new vma is allocated
* either for the first part or the tail.
*/
-int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
- unsigned long addr, int new_below)
+static int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
+ unsigned long addr, int new_below)
{
if (vma->vm_mm->map_count >= sysctl_max_map_count)
return -ENOMEM;
diff --git a/mm/nommu.c b/mm/nommu.c
index f9553579389b..fc4afe924ad5 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1305,8 +1305,8 @@ SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg)
* split a vma into two pieces at address 'addr', a new vma is allocated either
* for the first part or the tail.
*/
-int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
- unsigned long addr, int new_below)
+static int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
+ unsigned long addr, int new_below)
{
struct vm_area_struct *new;
struct vm_region *region;
--
2.42.0
next prev parent reply other threads:[~2023-10-09 20:53 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-09 20:53 [PATCH v2 0/5] Abstract vma_merge() and split_vma() Lorenzo Stoakes
2023-10-09 20:53 ` [PATCH v2 1/5] mm: move vma_policy() and anon_vma_name() decls to mm_types.h Lorenzo Stoakes
2023-10-10 6:46 ` Vlastimil Babka
2023-10-09 20:53 ` [PATCH v2 2/5] mm: abstract the vma_merge()/split_vma() pattern for mprotect() et al Lorenzo Stoakes
2023-10-10 7:12 ` Vlastimil Babka
2023-10-10 18:11 ` Lorenzo Stoakes
2023-10-11 2:14 ` Liam R. Howlett
2023-10-11 6:34 ` Lorenzo Stoakes
2023-10-09 20:53 ` Lorenzo Stoakes [this message]
2023-10-09 20:53 ` [PATCH v2 4/5] mm: abstract merge for new VMAs into vma_merge_new_vma() Lorenzo Stoakes
2023-10-11 1:51 ` Liam R. Howlett
2023-10-11 6:48 ` Lorenzo Stoakes
2023-10-09 20:53 ` [PATCH v2 5/5] mm: abstract VMA merge and extend into vma_merge_extend() helper Lorenzo Stoakes
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