linux-kernel - Re: [PATCH 1/9] userfaultfd/hugetlbfs: avoid including userfaultfd

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Message-ID: <20210412234707.GB1002612@xz-x1>
Date:   Mon, 12 Apr 2021 19:47:07 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Axel Rasmussen <axelrasmussen@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Colascione <dancol@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Joe Perches <joe@...ches.com>,
        Lokesh Gidra <lokeshgidra@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Shaohua Li <shli@...com>, Shuah Khan <shuah@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Wang Qing <wangqing@...o.com>, linux-api@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
        Brian Geffon <bgeffon@...gle.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Oliver Upton <oupton@...gle.com>
Subject: Re: [PATCH 1/9] userfaultfd/hugetlbfs: avoid including
 userfaultfd_k.h in hugetlb.h

On Thu, Apr 08, 2021 at 04:43:19PM -0700, Axel Rasmussen wrote:
> Minimizing header file inclusion is desirable. In this case, we can do
> so just by forward declaring the enumeration our signature relies upon.
> 
> Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>
> ---
>  include/linux/hugetlb.h | 5 ++++-
>  mm/hugetlb.c            | 1 +
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 1d3246b31a41..dfb749eaf348 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -11,7 +11,6 @@
>  #include <linux/kref.h>
>  #include <linux/pgtable.h>
>  #include <linux/gfp.h>
> -#include <linux/userfaultfd_k.h>
>  
>  struct ctl_table;
>  struct user_struct;
> @@ -136,6 +135,8 @@ unsigned long hugetlb_total_pages(void);
>  vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
>  			unsigned long address, unsigned int flags);
>  #ifdef CONFIG_USERFAULTFD
> +enum mcopy_atomic_mode;

(I'm not 100% sure, but.. maybe this can be moved even out of ifdef?  Then you
 can define it once at the top rather than twice?)

Reviewed-by: Peter Xu <peterx@...hat.com>

-- 
Peter Xu