linux-kernel - Re: [PATCH v2 1/4] mm: factor out VMA stack and heap checks

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Message-ID: <456a78ae-5d7e-9955-5edb-f9f46c22bd75@redhat.com>
Date:   Wed, 19 Jul 2023 10:18:02 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-perf-users@...r.kernel.org,
        selinux@...r.kernel.org,
        Christian Göttsche <cgzones@...glemail.com>
Subject: Re: [PATCH v2 1/4] mm: factor out VMA stack and heap checks

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@...glemail.com>
> Cc: David Hildenbrand <david@...hat.com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---


[...]

> 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@...hat.com>

-- 
Cheers,

David / dhildenb