linux-kernel - Re: [RFC PATCH RESEND 04/28] mm: move mmap

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Date:   Thu, 1 Sep 2022 16:24:09 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     akpm@...ux-foundation.org, michel@...pinasse.org,
        jglisse@...gle.com, mhocko@...e.com, vbabka@...e.cz,
        hannes@...xchg.org, mgorman@...e.de, dave@...olabs.net,
        willy@...radead.org, liam.howlett@...cle.com, peterz@...radead.org,
        ldufour@...ux.ibm.com, laurent.dufour@...ibm.com,
        paulmck@...nel.org, luto@...nel.org, songliubraving@...com,
        peterx@...hat.com, david@...hat.com, dhowells@...hat.com,
        hughd@...gle.com, bigeasy@...utronix.de, rientjes@...gle.com,
        axelrasmussen@...gle.com, joelaf@...gle.com, minchan@...gle.com,
        kernel-team@...roid.com, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH RESEND 04/28] mm: move mmap_lock assert function
 definitions

On Thu, Sep 01, 2022 at 10:34:52AM -0700, Suren Baghdasaryan wrote:
> Move mmap_lock assert function definitions up so that they can be used
> by other mmap_lock routines.
> 
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> ---
>  include/linux/mmap_lock.h | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
> index 96e113e23d04..e49ba91bb1f0 100644
> --- a/include/linux/mmap_lock.h
> +++ b/include/linux/mmap_lock.h
> @@ -60,6 +60,18 @@ static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
>  
>  #endif /* CONFIG_TRACING */
>  
> +static inline void mmap_assert_locked(struct mm_struct *mm)
> +{
> +	lockdep_assert_held(&mm->mmap_lock);
> +	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);

These look redundant to me - maybe there's a reason the VM developers want both,
but I would drop the VM_BUG_ON() and just keep the lockdep_assert_held(), since
that's the standard way to write that assertion.