linux-kernel - Re: [PATCH v4 02/10] MMU notifier: use the new mmap locking API

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Date:   Mon, 20 Apr 2020 12:51:12 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Michel Lespinasse <walken@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Liam Howlett <Liam.Howlett@...cle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        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>
Subject: Re: [PATCH v4 02/10] MMU notifier: use the new mmap locking API

On Tue, 14 Apr 2020, 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>

>---
> 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);
>-- 
>2.26.0.110.g2183baf09c-goog
>