From 11250fd12eb8a58205e69ea36f19fa8c084afb62 Mon Sep 17 00:00:00 2001 From: Kefeng Wang Date: Fri, 28 Jul 2023 13:00:40 +0800 Subject: mm: factor out VMA stack and heap checks MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Patch series "mm: convert to vma_is_initial_heap/stack()", v3. Add vma_is_initial_stack() and vma_is_initial_heap() helpers and use them to simplify code. This patch (of 4): Factor out VMA stack and heap checks and name them vma_is_initial_stack() and vma_is_initial_heap() for general use. Link: https://lkml.kernel.org/r/20230728050043.59880-1-wangkefeng.wang@huawei.com Link: https://lkml.kernel.org/r/20230728050043.59880-2-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Reviewed-by: David Hildenbrand Acked-by: Peter Zijlstra (Intel) Cc: Christian Göttsche Cc: Alex Deucher Cc: Arnaldo Carvalho de Melo Cc: Christian Göttsche Cc: Christian König Cc: Daniel Vetter Cc: David Airlie Cc: Eric Paris Cc: Felix Kuehling Cc: "Pan, Xinhui" Cc: Paul Moore Cc: Stephen Smalley Signed-off-by: Andrew Morton --- include/linux/mm.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'include') diff --git a/include/linux/mm.h b/include/linux/mm.h index b2520dd555f9..f64d1de3af09 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -833,6 +833,31 @@ static inline bool vma_is_anonymous(struct vm_area_struct *vma) return !vma->vm_ops; } +/* + * Indicate if the VMA is a heap for the given task; for + * /proc/PID/maps that is the heap of the main task. + */ +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); -- cgit v1.2.3