linux-kernel - Re: [PATCH v11 2/7] userfaultfd: Define dummy uffd_wp

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Date:   Thu, 16 Mar 2023 09:02:11 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc:     Peter Xu <peterx@...hat.com>, David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michał Mirosław <emmir@...gle.com>,
        Andrei Vagin <avagin@...il.com>,
        Danylo Mocherniuk <mdanylo@...gle.com>,
        Paul Gofman <pgofman@...eweavers.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Nadav Amit <namit@...are.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>,
        Christian Brauner <brauner@...nel.org>,
        Yang Shi <shy828301@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Yun Zhou <yun.zhou@...driver.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Alex Sierra <alex.sierra@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        Greg KH <gregkh@...uxfoundation.org>, kernel@...labora.com
Subject: Re: [PATCH v11 2/7] userfaultfd: Define dummy uffd_wp_range()

Hi,

On Thu, Mar 09, 2023 at 06:57:13PM +0500, Muhammad Usama Anjum wrote:
> Define uffd_wp_range() for the cases when CONFIG_USERFAULTFD isn't set.
> 
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
>  include/linux/userfaultfd_k.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h
> index b680c0ec8b85..fd1a1ecdb5f6 100644
> --- a/include/linux/userfaultfd_k.h
> +++ b/include/linux/userfaultfd_k.h
> @@ -182,6 +182,14 @@ extern int userfaultfd_wp_async(struct vm_area_struct *vma);
>  
>  #else /* CONFIG_USERFAULTFD */
>  
> +extern inline long uffd_wp_range(struct mm_struct *dst_mm,

static inline

> +				 struct vm_area_struct *vma,
> +				 unsigned long start, unsigned long len,
> +				 bool enable_wp)
> +{
> +	return 0;
> +}
> +

I didn't see uffd_wp_range() defined in the previous patch.
Could be a rebase issue?

In any case, the stub should be defined in the same patch as the actual
function in order not to break bisectability.

>  /* mm helpers */
>  static inline vm_fault_t handle_userfault(struct vm_fault *vmf,
>  				unsigned long reason)
> -- 
> 2.39.2
> 

-- 
Sincerely yours,
Mike.