linux-kernel - Re: [PATCH] mm: remove duplicated vma->vm

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Date:   Sun, 10 Sep 2023 14:26:27 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Xiu Jianfeng <xiujianfeng@...weicloud.com>
Cc:     Liam.Howlett@...cle.com, willy@...radead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, xiujianfeng@...wei.com
Subject: Re: [PATCH] mm: remove duplicated vma->vm_flags check when
 expanding stack

On Wed,  6 Sep 2023 10:33:12 +0000 Xiu Jianfeng <xiujianfeng@...weicloud.com> wrote:

> expand_upwards() and expand_downwards() will return -EFAULT if VM_GROWSUP
> or VM_GROWSDOWN is not correctly set in vma->vm_flags, however in
> !CONFIG_STACK_GROWSUP case, expand_stack_locked() returns -EINVAL first
> if !(vma->vm_flags & VM_GROWSDOWN) before calling expand_downwards(), to
> keep the consistency with CONFIG_STACK_GROWSUP case, remove this check.

What are the user-visible effects of this change?

Do you believe this fix should be backported into earlier kernel versions?