linux-kernel - Re: [PATCH v5 02/10] MMU notifier: use the new mmap locking API

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Date:   Mon, 18 May 2020 11:28:52 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michel Lespinasse <walken@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Matthew Wilcox <willy@...radead.org>,
        Liam Howlett <Liam.Howlett@...cle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        David Rientjes <rientjes@...gle.com>,
        Hugh Dickins <hughd@...gle.com>, Ying Han <yinghan@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH v5 02/10] MMU notifier: use the new mmap locking API

On 4/22/20 2:14 AM, Michel Lespinasse wrote:
> This use is converted manually ahead of the next patch in the series,
> as it requires including a new header which the automated conversion
> would miss.
> 
> Signed-off-by: Michel Lespinasse <walken@...gle.com>
> Reviewed-by: Daniel Jordan <daniel.m.jordan@...cle.com>
> Reviewed-by: Davidlohr Bueso <dbueso@...e.de>

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  include/linux/mmu_notifier.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
> index 736f6918335e..2f462710a1a4 100644
> --- a/include/linux/mmu_notifier.h
> +++ b/include/linux/mmu_notifier.h
> @@ -5,6 +5,7 @@
>  #include <linux/list.h>
>  #include <linux/spinlock.h>
>  #include <linux/mm_types.h>
> +#include <linux/mmap_lock.h>
>  #include <linux/srcu.h>
>  #include <linux/interval_tree.h>
>  
> @@ -277,9 +278,9 @@ mmu_notifier_get(const struct mmu_notifier_ops *ops, struct mm_struct *mm)
>  {
>  	struct mmu_notifier *ret;
>  
> -	down_write(&mm->mmap_sem);
> +	mmap_write_lock(mm);
>  	ret = mmu_notifier_get_locked(ops, mm);
> -	up_write(&mm->mmap_sem);
> +	mmap_write_unlock(mm);
>  	return ret;
>  }
>  void mmu_notifier_put(struct mmu_notifier *subscription);
>