linux-kernel - Re: [PATCH v2 1/2] mmap locking API: add mmap_lock_is

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Message-ID: <CANN689FtXN-6tGkyGc9ja7rrZTTUEoW5omfEJ=PmOaft4YkaaA@mail.gmail.com>
Date:   Fri, 14 Aug 2020 01:30:39 -0700
From:   Michel Lespinasse <walken@...gle.com>
To:     Chinwen Chang <chinwen.chang@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Davidlohr Bueso <dbueso@...e.de>,
        Alexey Dobriyan <adobriyan@...il.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Steven Price <steven.price@....com>,
        Song Liu <songliubraving@...com>,
        Jimmy Assarsson <jimmyassarsson@...il.com>,
        Huang Ying <ying.huang@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        wsd_upstream@...iatek.com
Subject: Re: [PATCH v2 1/2] mmap locking API: add mmap_lock_is_contended()

On Wed, Aug 12, 2020 at 7:14 PM Chinwen Chang
<chinwen.chang@...iatek.com> wrote:
>
> Add new API to query if someone wants to acquire mmap_lock
> for write attempts.
>
> Using this instead of rwsem_is_contended makes it more tolerant
> of future changes to the lock type.
>
> Signed-off-by: Chinwen Chang <chinwen.chang@...iatek.com>

Acked-by: Michel Lespinasse <walken@...gle.com>