diff mbox series

[1/5] mm: introduce vma_is_stack() and vma_is_heap()

Message ID 20230712143831.120701-2-wangkefeng.wang@huawei.com (mailing list archive)
State Handled Elsewhere
Headers show
Series mm: convert to vma_is_heap/stack() | expand

Commit Message

Kefeng Wang July 12, 2023, 2:38 p.m. UTC 
Introduce the two helpers for general use.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 include/linux/mm.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Comments

David Hildenbrand July 17, 2023, 10:26 a.m. UTC | #1 
On 12.07.23 16:38, Kefeng Wang wrote:
> Introduce the two helpers for general use.
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> ---
>   include/linux/mm.h | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 1462cf15badf..0bbeb31ac750 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -926,6 +926,18 @@ static inline bool vma_is_anonymous(struct vm_area_struct *vma)
>   	return !vma->vm_ops;
>   }
>   
> +static inline bool vma_is_heap(struct vm_area_struct *vma)
> +{
> +       return vma->vm_start <= vma->vm_mm->brk &&
> +		vma->vm_end >= vma->vm_mm->start_brk;
> +}
> +
> +static inline bool vma_is_stack(struct vm_area_struct *vma)
> +{
> +       return vma->vm_start <= vma->vm_mm->start_stack &&
> +	       vma->vm_end >= vma->vm_mm->start_stack;
> +}
> +
>   static inline bool vma_is_temporary_stack(struct vm_area_struct *vma)
>   {
>   	int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP);

Looking at the comments in patch #3, should these functions be called

vma_is_initial_heap / vma_is_initial_stack ?
Christian Göttsche July 18, 2023, 3:10 p.m. UTC | #2 
On Wed, 12 Jul 2023 at 16:25, Kefeng Wang <wangkefeng.wang@huawei.com> wrote:
>
> Introduce the two helpers for general use.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> ---
>  include/linux/mm.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 1462cf15badf..0bbeb31ac750 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -926,6 +926,18 @@ static inline bool vma_is_anonymous(struct vm_area_struct *vma)
>         return !vma->vm_ops;
>  }
>
> +static inline bool vma_is_heap(struct vm_area_struct *vma)

What about declaring the parameters const to document in code these
functions do not modify any state, and allow callers to pass pointers
to const?

> +{
> +       return vma->vm_start <= vma->vm_mm->brk &&
> +               vma->vm_end >= vma->vm_mm->start_brk;
> +}
> +
> +static inline bool vma_is_stack(struct vm_area_struct *vma)
> +{
> +       return vma->vm_start <= vma->vm_mm->start_stack &&
> +              vma->vm_end >= vma->vm_mm->start_stack;
> +}
> +
>  static inline bool vma_is_temporary_stack(struct vm_area_struct *vma)
>  {
>         int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP);
> --
> 2.41.0
>
diff mbox series

Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1462cf15badf..0bbeb31ac750 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -926,6 +926,18 @@  static inline bool vma_is_anonymous(struct vm_area_struct *vma)
 	return !vma->vm_ops;
 }
 
+static inline bool vma_is_heap(struct vm_area_struct *vma)
+{
+       return vma->vm_start <= vma->vm_mm->brk &&
+		vma->vm_end >= vma->vm_mm->start_brk;
+}
+
+static inline bool vma_is_stack(struct vm_area_struct *vma)
+{
+       return vma->vm_start <= vma->vm_mm->start_stack &&
+	       vma->vm_end >= vma->vm_mm->start_stack;
+}
+
 static inline bool vma_is_temporary_stack(struct vm_area_struct *vma)
 {
 	int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP);