linux-kernel - Re: [PATCH 16/34] drivers/tee: convert put_page() to put_user

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Date:   Fri, 2 Aug 2019 08:29:07 +0200
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     john.hubbard@...il.com
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jérôme Glisse <jglisse@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org, ceph-devel@...r.kernel.org,
        devel@...verdev.osuosl.org, devel@...ts.orangefs.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        kvm@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-block@...r.kernel.org,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>, linux-fbdev@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-mm@...ck.org, linux-nfs@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-xfs@...r.kernel.org, netdev@...r.kernel.org,
        rds-devel@....oracle.com, sparclinux@...r.kernel.org,
        x86@...nel.org, xen-devel@...ts.xenproject.org,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH 16/34] drivers/tee: convert put_page() to put_user_page*()

On Fri, Aug 2, 2019 at 4:20 AM <john.hubbard@...il.com> wrote:
>
> From: John Hubbard <jhubbard@...dia.com>
>
> For pages that were retained via get_user_pages*(), release those pages
> via the new put_user_page*() routines, instead of via put_page() or
> release_pages().
>
> This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> ("mm: introduce put_user_page*(), placeholder versions").
>
> Cc: Jens Wiklander <jens.wiklander@...aro.org>
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>  drivers/tee/tee_shm.c | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)

Acked-by: Jens Wiklander <jens.wiklander@...aro.org>

I suppose you're taking this via your own tree or such.

Thanks,
Jens

>
> diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
> index 2da026fd12c9..c967d0420b67 100644
> --- a/drivers/tee/tee_shm.c
> +++ b/drivers/tee/tee_shm.c
> @@ -31,16 +31,13 @@ static void tee_shm_release(struct tee_shm *shm)
>
>                 poolm->ops->free(poolm, shm);
>         } else if (shm->flags & TEE_SHM_REGISTER) {
> -               size_t n;
>                 int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
>
>                 if (rc)
>                         dev_err(teedev->dev.parent,
>                                 "unregister shm %p failed: %d", shm, rc);
>
> -               for (n = 0; n < shm->num_pages; n++)
> -                       put_page(shm->pages[n]);
> -
> +               put_user_pages(shm->pages, shm->num_pages);
>                 kfree(shm->pages);
>         }
>
> @@ -313,16 +310,13 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
>         return shm;
>  err:
>         if (shm) {
> -               size_t n;
> -
>                 if (shm->id >= 0) {
>                         mutex_lock(&teedev->mutex);
>                         idr_remove(&teedev->idr, shm->id);
>                         mutex_unlock(&teedev->mutex);
>                 }
>                 if (shm->pages) {
> -                       for (n = 0; n < shm->num_pages; n++)
> -                               put_page(shm->pages[n]);
> +                       put_user_pages(shm->pages, shm->num_pages);
>                         kfree(shm->pages);
>                 }
>         }
> --
> 2.22.0
>