The patch titled
Subject: IB/umem: use get_user_pages_fast() to pin DMA pages
has been removed from the -mm tree. Its filename was
ib-umem-use-get_user_pages_fast-to-pin-dma-pages.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: John Hubbard <jhubbard@xxxxxxxxxx>
Subject: IB/umem: use get_user_pages_fast() to pin DMA pages
And get rid of the mmap_sem calls, as part of that. Note that
get_user_pages_fast() will, if necessary, fall back to
__gup_longterm_unlocked(), which takes the mmap_sem as needed.
Link: http://lkml.kernel.org/r/20200107224558.2362728-10-jhubbard@xxxxxxxxxx
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Björn Töpel <bjorn.topel@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Jerome Glisse <jglisse@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/core/umem.c | 17 ++++++-----------
1 file changed, 6 insertions(+), 11 deletions(-)
--- a/drivers/infiniband/core/umem.c~ib-umem-use-get_user_pages_fast-to-pin-dma-pages
+++ a/drivers/infiniband/core/umem.c
@@ -257,16 +257,13 @@ struct ib_umem *ib_umem_get(struct ib_de
sg = umem->sg_head.sgl;
while (npages) {
- down_read(&mm->mmap_sem);
- ret = get_user_pages(cur_base,
- min_t(unsigned long, npages,
- PAGE_SIZE / sizeof (struct page *)),
- gup_flags | FOLL_LONGTERM,
- page_list, NULL);
- if (ret < 0) {
- up_read(&mm->mmap_sem);
+ ret = get_user_pages_fast(cur_base,
+ min_t(unsigned long, npages,
+ PAGE_SIZE /
+ sizeof(struct page *)),
+ gup_flags | FOLL_LONGTERM, page_list);
+ if (ret < 0)
goto umem_release;
- }
cur_base += ret * PAGE_SIZE;
npages -= ret;
@@ -274,8 +271,6 @@ struct ib_umem *ib_umem_get(struct ib_de
sg = ib_umem_add_sg_table(sg, page_list, ret,
dma_get_max_seg_size(device->dma_device),
&umem->sg_nents);
-
- up_read(&mm->mmap_sem);
}
sg_mark_end(sg);
_
Patches currently in -mm which might be from jhubbard@xxxxxxxxxx are
