On Thu, Jul 25, 2019 at 09:46:34AM +0200, Greg KH wrote:
> On Sat, Jul 20, 2019 at 11:02:14PM +0530, Bharath Vedartham wrote:
> > For pages that were retained via get_user_pages*(), release those pages
> > via the new put_user_page*() routines, instead of via put_page().
> >
> > This is part a tree-wide conversion, as described in commit fc1d8e7cca2d ("mm: introduce put_user_page*(), placeholder versions").
>
> Please line-wrap this line.
>
> >
> > Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
> > Cc: John Hubbard <jhubbard@xxxxxxxxxx>
> > Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> > Cc: Matt Sickler <Matt.Sickler@xxxxxxxxxxxxxx>
> > Cc: devel@xxxxxxxxxxxxxxxxxxxx
> > Cc: linux-kernel@xxxxxxxxxxxxxxx
> > Cc: linux-mm@xxxxxxxxx
> > Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
> > Signed-off-by: Bharath Vedartham <linux.bhar@xxxxxxxxx>
> > ---
> > Changes since v1
> > - Improved changelog by John's suggestion.
> > - Moved logic to dirty pages below sg_dma_unmap
> > and removed PageReserved check.
> > Changes since v2
> > - Added back PageResevered check as suggested by John Hubbard.
> > Changes since v3
> > - Changed the commit log as suggested by John.
> > - Added John's Reviewed-By tag
> >
> > ---
> > drivers/staging/kpc2000/kpc_dma/fileops.c | 17 ++++++-----------
> > 1 file changed, 6 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/staging/kpc2000/kpc_dma/fileops.c b/drivers/staging/kpc2000/kpc_dma/fileops.c
> > index 6166587..75ad263 100644
> > --- a/drivers/staging/kpc2000/kpc_dma/fileops.c
> > +++ b/drivers/staging/kpc2000/kpc_dma/fileops.c
> > @@ -198,9 +198,7 @@ int kpc_dma_transfer(struct dev_private_data *priv, struct kiocb *kcb, unsigned
> > sg_free_table(&acd->sgt);
> > err_dma_map_sg:
> > err_alloc_sg_table:
> > - for (i = 0 ; i < acd->page_count ; i++){
> > - put_page(acd->user_pages[i]);
> > - }
> > + put_user_pages(acd->user_pages, acd->page_count);
> > err_get_user_pages:
> > kfree(acd->user_pages);
> > err_alloc_userpages:
> > @@ -221,16 +219,13 @@ void transfer_complete_cb(struct aio_cb_data *acd, size_t xfr_count, u32 flags)
> >
> > dev_dbg(&acd->ldev->pldev->dev, "transfer_complete_cb(acd = [%p])\n", acd);
> >
> > - for (i = 0 ; i < acd->page_count ; i++){
> > - if (!PageReserved(acd->user_pages[i])){
> > - set_page_dirty(acd->user_pages[i]);
> > - }
> > - }
> > -
> > dma_unmap_sg(&acd->ldev->pldev->dev, acd->sgt.sgl, acd->sgt.nents, acd->ldev->dir);
> >
> > - for (i = 0 ; i < acd->page_count ; i++){
> > - put_page(acd->user_pages[i]);
> > + for (i = 0; i < acd->page_count; i++) {
> > + if (!PageReserved(acd->user_pages[i]))
> > + put_user_pages_dirty(&acd->user_pages[i], 1);
> > + else
> > + put_user_page(acd->user_pages[i]);
> > }
> >
> > sg_free_table(&acd->sgt);
> > --
> > 2.7.4
>
> This patch can not be applied at all :(
>
> Can you redo it against the latest staging-next branch and resend?
>
> thanks,
Yup. Will do that!
> greg k-h
