On 19.07.23 09:51, Kefeng Wang wrote:
Factor out VMA stack and heap checks and name them
vma_is_initial_stack() and vma_is_initial_heap() for
general use.
Cc: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
---
[...]
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2dd73e4f3d8e..51f8c573db74 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -822,6 +822,27 @@ static inline bool vma_is_anonymous(struct vm_area_struct *vma)
return !vma->vm_ops;
}
Worth adding a similar comment like for vma_is_initial_stack() ?
+static inline bool vma_is_initial_heap(const struct vm_area_struct *vma)
+{
+ return vma->vm_start <= vma->vm_mm->brk &&
+ vma->vm_end >= vma->vm_mm->start_brk;
+}
+
+/*
+ * Indicate if the VMA is a stack for the given task; for
+ * /proc/PID/maps that is the stack of the main task.
+ */
+static inline bool vma_is_initial_stack(const struct vm_area_struct *vma)
+{
+ /*
+ * We make no effort to guess what a given thread considers to be
+ * its "stack". It's not even well-defined for programs written
+ * languages like Go.
+ */
+ 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);
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
--
Cheers,
David / dhildenb
