[PATCH v8 22/26] mm, tree-wide: rename put_user_page*() to unpin_user_page*()

From: John Hubbard
Date: Mon Dec 09 2019 - 17:54:49 EST

In order to provide a clearer, more symmetric API for pinning
and unpinning DMA pages. This way, pin_user_pages*() calls
match up with unpin_user_pages*() calls, and the API is a lot
closer to being self-explanatory.

Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
Documentation/core-api/pin_user_pages.rst | 2 +-
arch/powerpc/mm/book3s64/iommu_api.c | 4 +--
drivers/gpu/drm/via/via_dmablit.c | 4 +--
drivers/infiniband/core/umem.c | 2 +-
drivers/infiniband/hw/hfi1/user_pages.c | 2 +-
drivers/infiniband/hw/mthca/mthca_memfree.c | 6 ++--
drivers/infiniband/hw/qib/qib_user_pages.c | 2 +-
drivers/infiniband/hw/qib/qib_user_sdma.c | 6 ++--
drivers/infiniband/hw/usnic/usnic_uiom.c | 2 +-
drivers/infiniband/sw/siw/siw_mem.c | 2 +-
drivers/media/v4l2-core/videobuf-dma-sg.c | 4 +--
drivers/platform/goldfish/goldfish_pipe.c | 4 +--
drivers/vfio/vfio_iommu_type1.c | 2 +-
fs/io_uring.c | 4 +--
include/linux/mm.h | 26 ++++++++---------
mm/gup.c | 32 ++++++++++-----------
mm/process_vm_access.c | 4 +--
net/xdp/xdp_umem.c | 2 +-
18 files changed, 55 insertions(+), 55 deletions(-)

diff --git a/Documentation/core-api/pin_user_pages.rst b/Documentation/core-api/pin_user_pages.rst
index 4f26637a5005..bba96428ade7 100644
--- a/Documentation/core-api/pin_user_pages.rst
+++ b/Documentation/core-api/pin_user_pages.rst
@@ -220,7 +220,7 @@ since the system was booted, via two new /proc/vmstat entries: ::
/proc/vmstat/nr_foll_pin_requested

Those are both going to show zero, unless CONFIG_DEBUG_VM is set. This is
-because there is a noticeable performance drop in put_user_page(), when they
+because there is a noticeable performance drop in unpin_user_page(), when they
are activated.

References
diff --git a/arch/powerpc/mm/book3s64/iommu_api.c b/arch/powerpc/mm/book3s64/iommu_api.c
index fc1670a6fc3c..b965a0dfd4a2 100644
--- a/arch/powerpc/mm/book3s64/iommu_api.c
+++ b/arch/powerpc/mm/book3s64/iommu_api.c
@@ -168,7 +168,7 @@ static long mm_iommu_do_alloc(struct mm_struct *mm, unsigned long ua,

free_exit:
/* free the references taken */
- put_user_pages(mem->hpages, pinned);
+ unpin_user_pages(mem->hpages, pinned);

vfree(mem->hpas);
kfree(mem);
@@ -211,7 +211,7 @@ static void mm_iommu_unpin(struct mm_iommu_table_group_mem_t *mem)
if (!page)
continue;

- put_user_pages_dirty_lock(&page, 1,
+ unpin_user_pages_dirty_lock(&page, 1,
mem->hpas[i] & MM_IOMMU_TABLE_GROUP_PAGE_DIRTY);

mem->hpas[i] = 0;
diff --git a/drivers/gpu/drm/via/via_dmablit.c b/drivers/gpu/drm/via/via_dmablit.c
index 37c5e572993a..719d036c9384 100644
--- a/drivers/gpu/drm/via/via_dmablit.c
+++ b/drivers/gpu/drm/via/via_dmablit.c
@@ -188,8 +188,8 @@ via_free_sg_info(struct pci_dev *pdev, drm_via_sg_info_t *vsg)
kfree(vsg->desc_pages);
/* fall through */
case dr_via_pages_locked:
- put_user_pages_dirty_lock(vsg->pages, vsg->num_pages,
- (vsg->direction == DMA_FROM_DEVICE));
+ unpin_user_pages_dirty_lock(vsg->pages, vsg->num_pages,
+ (vsg->direction == DMA_FROM_DEVICE));
/* fall through */
case dr_via_pages_alloc:
vfree(vsg->pages);
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 55daefaa9b88..a6094766b6f5 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -54,7 +54,7 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d

for_each_sg_page(umem->sg_head.sgl, &sg_iter, umem->sg_nents, 0) {
page = sg_page_iter_page(&sg_iter);
- put_user_pages_dirty_lock(&page, 1, umem->writable && dirty);
+ unpin_user_pages_dirty_lock(&page, 1, umem->writable && dirty);
}

sg_free_table(&umem->sg_head);
diff --git a/drivers/infiniband/hw/hfi1/user_pages.c b/drivers/infiniband/hw/hfi1/user_pages.c
index 9a94761765c0..3b505006c0a6 100644
--- a/drivers/infiniband/hw/hfi1/user_pages.c
+++ b/drivers/infiniband/hw/hfi1/user_pages.c
@@ -118,7 +118,7 @@ int hfi1_acquire_user_pages(struct mm_struct *mm, unsigned long vaddr, size_t np
void hfi1_release_user_pages(struct mm_struct *mm, struct page **p,
size_t npages, bool dirty)
{
- put_user_pages_dirty_lock(p, npages, dirty);
+ unpin_user_pages_dirty_lock(p, npages, dirty);

if (mm) { /* during close after signal, mm can be NULL */
atomic64_sub(npages, &mm->pinned_vm);
diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c
index 8269ab040c21..78a48aea3faf 100644
--- a/drivers/infiniband/hw/mthca/mthca_memfree.c
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.c
@@ -482,7 +482,7 @@ int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,

ret = pci_map_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
if (ret < 0) {
- put_user_page(pages[0]);
+ unpin_user_page(pages[0]);
goto out;
}

@@ -490,7 +490,7 @@ int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
mthca_uarc_virt(dev, uar, i));
if (ret) {
pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
- put_user_page(sg_page(&db_tab->page[i].mem));
+ unpin_user_page(sg_page(&db_tab->page[i].mem));
goto out;
}

@@ -556,7 +556,7 @@ void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
if (db_tab->page[i].uvirt) {
mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, uar, i), 1);
pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
- put_user_page(sg_page(&db_tab->page[i].mem));
+ unpin_user_page(sg_page(&db_tab->page[i].mem));
}
}

diff --git a/drivers/infiniband/hw/qib/qib_user_pages.c b/drivers/infiniband/hw/qib/qib_user_pages.c
index 7fc4b5f81fcd..342e3172ca40 100644
--- a/drivers/infiniband/hw/qib/qib_user_pages.c
+++ b/drivers/infiniband/hw/qib/qib_user_pages.c
@@ -40,7 +40,7 @@
static void __qib_release_user_pages(struct page **p, size_t num_pages,
int dirty)
{
- put_user_pages_dirty_lock(p, num_pages, dirty);
+ unpin_user_pages_dirty_lock(p, num_pages, dirty);
}

/**
diff --git a/drivers/infiniband/hw/qib/qib_user_sdma.c b/drivers/infiniband/hw/qib/qib_user_sdma.c
index 1a3cc2957e3a..a67599b5a550 100644
--- a/drivers/infiniband/hw/qib/qib_user_sdma.c
+++ b/drivers/infiniband/hw/qib/qib_user_sdma.c
@@ -317,7 +317,7 @@ static int qib_user_sdma_page_to_frags(const struct qib_devdata *dd,
* the caller can ignore this page.
*/
if (put) {
- put_user_page(page);
+ unpin_user_page(page);
} else {
/* coalesce case */
kunmap(page);
@@ -631,7 +631,7 @@ static void qib_user_sdma_free_pkt_frag(struct device *dev,
kunmap(pkt->addr[i].page);

if (pkt->addr[i].put_page)
- put_user_page(pkt->addr[i].page);
+ unpin_user_page(pkt->addr[i].page);
else
__free_page(pkt->addr[i].page);
} else if (pkt->addr[i].kvaddr) {
@@ -706,7 +706,7 @@ static int qib_user_sdma_pin_pages(const struct qib_devdata *dd,
/* if error, return all pages not managed by pkt */
free_pages:
while (i < j)
- put_user_page(pages[i++]);
+ unpin_user_page(pages[i++]);

done:
return ret;
diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c b/drivers/infiniband/hw/usnic/usnic_uiom.c
index 600896727d34..bd9f944b68fc 100644
--- a/drivers/infiniband/hw/usnic/usnic_uiom.c
+++ b/drivers/infiniband/hw/usnic/usnic_uiom.c
@@ -75,7 +75,7 @@ static void usnic_uiom_put_pages(struct list_head *chunk_list, int dirty)
for_each_sg(chunk->page_list, sg, chunk->nents, i) {
page = sg_page(sg);
pa = sg_phys(sg);
- put_user_pages_dirty_lock(&page, 1, dirty);
+ unpin_user_pages_dirty_lock(&page, 1, dirty);
usnic_dbg("pa: %pa\n", &pa);
}
kfree(chunk);
diff --git a/drivers/infiniband/sw/siw/siw_mem.c b/drivers/infiniband/sw/siw/siw_mem.c
index e53b07dcfed5..e2061dc0b043 100644
--- a/drivers/infiniband/sw/siw/siw_mem.c
+++ b/drivers/infiniband/sw/siw/siw_mem.c
@@ -63,7 +63,7 @@ struct siw_mem *siw_mem_id2obj(struct siw_device *sdev, int stag_index)
static void siw_free_plist(struct siw_page_chunk *chunk, int num_pages,
bool dirty)
{
- put_user_pages_dirty_lock(chunk->plist, num_pages, dirty);
+ unpin_user_pages_dirty_lock(chunk->plist, num_pages, dirty);
}

void siw_umem_release(struct siw_umem *umem, bool dirty)
diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c
index 162a2633b1e3..13b65ed9e74c 100644
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf-dma-sg.c
@@ -349,8 +349,8 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma)
BUG_ON(dma->sglen);

if (dma->pages) {
- put_user_pages_dirty_lock(dma->pages, dma->nr_pages,
- dma->direction == DMA_FROM_DEVICE);
+ unpin_user_pages_dirty_lock(dma->pages, dma->nr_pages,
+ dma->direction == DMA_FROM_DEVICE);
kfree(dma->pages);
dma->pages = NULL;
}
diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index 2a5901efecde..1ab207ec9c94 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -360,8 +360,8 @@ static int transfer_max_buffers(struct goldfish_pipe *pipe,

*consumed_size = pipe->command_buffer->rw_params.consumed_size;

- put_user_pages_dirty_lock(pipe->pages, pages_count,
- !is_write && *consumed_size > 0);
+ unpin_user_pages_dirty_lock(pipe->pages, pages_count,
+ !is_write && *consumed_size > 0);

mutex_unlock(&pipe->lock);
return 0;
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 18bfc2fc8e6d..a177bf2c6683 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -310,7 +310,7 @@ static int put_pfn(unsigned long pfn, int prot)
if (!is_invalid_reserved_pfn(pfn)) {
struct page *page = pfn_to_page(pfn);

- put_user_pages_dirty_lock(&page, 1, prot & IOMMU_WRITE);
+ unpin_user_pages_dirty_lock(&page, 1, prot & IOMMU_WRITE);
return 1;
}
return 0;
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 9639ebc21e8a..f5a378251995 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4400,7 +4400,7 @@ static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx)
struct io_mapped_ubuf *imu = &ctx->user_bufs[i];

for (j = 0; j < imu->nr_bvecs; j++)
- put_user_page(imu->bvec[j].bv_page);
+ unpin_user_page(imu->bvec[j].bv_page);

if (ctx->account_mem)
io_unaccount_mem(ctx->user, imu->nr_bvecs);
@@ -4545,7 +4545,7 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,
* release any pages we did get
*/
if (pret > 0)
- put_user_pages(pages, pret);
+ unpin_user_pages(pages, pret);
if (ctx->account_mem)
io_unaccount_mem(ctx->user, nr_pages);
kvfree(imu->bvec);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 0fb9929e00af..6a1a357e7d86 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1045,27 +1045,27 @@ static inline void put_page(struct page *page)
}

/**
- * put_user_page() - release a gup-pinned page
+ * unpin_user_page() - release a gup-pinned page
* @page: pointer to page to be released
*
* Pages that were pinned via pin_user_pages*() must be released via either
- * put_user_page(), or one of the put_user_pages*() routines. This is so that
- * eventually such pages can be separately tracked and uniquely handled. In
+ * unpin_user_page(), or one of the unpin_user_pages*() routines. This is so
+ * that eventually such pages can be separately tracked and uniquely handled. In
* particular, interactions with RDMA and filesystems need special handling.
*
- * put_user_page() and put_page() are not interchangeable, despite this early
- * implementation that makes them look the same. put_user_page() calls must
+ * unpin_user_page() and put_page() are not interchangeable, despite this early
+ * implementation that makes them look the same. unpin_user_page() calls must
* be perfectly matched up with pin*() calls.
*/
-static inline void put_user_page(struct page *page)
+static inline void unpin_user_page(struct page *page)
{
put_page(page);
}

-void put_user_pages_dirty_lock(struct page **pages, unsigned long npages,
- bool make_dirty);
+void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
+ bool make_dirty);

-void put_user_pages(struct page **pages, unsigned long npages);
+void unpin_user_pages(struct page **pages, unsigned long npages);

#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
#define SECTION_IN_PAGE_FLAGS
@@ -2595,7 +2595,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
#define FOLL_ANON 0x8000 /* don't do file mappings */
#define FOLL_LONGTERM 0x10000 /* mapping lifetime is indefinite: see below */
#define FOLL_SPLIT_PMD 0x20000 /* split huge pmd before returning */
-#define FOLL_PIN 0x40000 /* pages must be released via put_user_page() */
+#define FOLL_PIN 0x40000 /* pages must be released via unpin_user_page */

/*
* FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each
@@ -2630,7 +2630,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
* Direct IO). This lets the filesystem know that some non-file-system entity is
* potentially changing the pages' data. In contrast to FOLL_GET (whose pages
* are released via put_page()), FOLL_PIN pages must be released, ultimately, by
- * a call to put_user_page().
+ * a call to unpin_user_page().
*
* FOLL_PIN is similar to FOLL_GET: both of these pin pages. They use different
* and separate refcounting mechanisms, however, and that means that each has
@@ -2638,7 +2638,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
*
* FOLL_GET: get_user_pages*() to acquire, and put_page() to release.
*
- * FOLL_PIN: pin_user_pages*() to acquire, and put_user_pages to release.
+ * FOLL_PIN: pin_user_pages*() to acquire, and unpin_user_pages to release.
*
* FOLL_PIN and FOLL_GET are mutually exclusive for a given function call.
* (The underlying pages may experience both FOLL_GET-based and FOLL_PIN-based
@@ -2648,7 +2648,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
* FOLL_PIN should be set internally by the pin_user_pages*() APIs, never
* directly by the caller. That's in order to help avoid mismatches when
* releasing pages: get_user_pages*() pages must be released via put_page(),
- * while pin_user_pages*() pages must be released via put_user_page().
+ * while pin_user_pages*() pages must be released via unpin_user_page().
*
* Please see Documentation/vm/pin_user_pages.rst for more information.
*/
diff --git a/mm/gup.c b/mm/gup.c
index 4862ff982bc3..73aedcefa4bd 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -52,7 +52,7 @@ static inline struct page *try_get_compound_head(struct page *page, int refs)
}

/**
- * put_user_pages_dirty_lock() - release and optionally dirty gup-pinned pages
+ * unpin_user_pages_dirty_lock() - release and optionally dirty gup-pinned pages
* @pages: array of pages to be maybe marked dirty, and definitely released.
* @npages: number of pages in the @pages array.
* @make_dirty: whether to mark the pages dirty
@@ -62,19 +62,19 @@ static inline struct page *try_get_compound_head(struct page *page, int refs)
*
* For each page in the @pages array, make that page (or its head page, if a
* compound page) dirty, if @make_dirty is true, and if the page was previously
- * listed as clean. In any case, releases all pages using put_user_page(),
- * possibly via put_user_pages(), for the non-dirty case.
+ * listed as clean. In any case, releases all pages using unpin_user_page(),
+ * possibly via unpin_user_pages(), for the non-dirty case.
*
- * Please see the put_user_page() documentation for details.
+ * Please see the unpin_user_page() documentation for details.
*
* set_page_dirty_lock() is used internally. If instead, set_page_dirty() is
* required, then the caller should a) verify that this is really correct,
* because _lock() is usually required, and b) hand code it:
- * set_page_dirty_lock(), put_user_page().
+ * set_page_dirty_lock(), unpin_user_page().
*
*/
-void put_user_pages_dirty_lock(struct page **pages, unsigned long npages,
- bool make_dirty)
+void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
+ bool make_dirty)
{
unsigned long index;

@@ -85,7 +85,7 @@ void put_user_pages_dirty_lock(struct page **pages, unsigned long npages,
*/

if (!make_dirty) {
- put_user_pages(pages, npages);
+ unpin_user_pages(pages, npages);
return;
}

@@ -113,21 +113,21 @@ void put_user_pages_dirty_lock(struct page **pages, unsigned long npages,
*/
if (!PageDirty(page))
set_page_dirty_lock(page);
- put_user_page(page);
+ unpin_user_page(page);
}
}
-EXPORT_SYMBOL(put_user_pages_dirty_lock);
+EXPORT_SYMBOL(unpin_user_pages_dirty_lock);

/**
- * put_user_pages() - release an array of gup-pinned pages.
+ * unpin_user_pages() - release an array of gup-pinned pages.
* @pages: array of pages to be marked dirty and released.
* @npages: number of pages in the @pages array.
*
- * For each page in the @pages array, release the page using put_user_page().
+ * For each page in the @pages array, release the page using unpin_user_page().
*
- * Please see the put_user_page() documentation for details.
+ * Please see the unpin_user_page() documentation for details.
*/
-void put_user_pages(struct page **pages, unsigned long npages)
+void unpin_user_pages(struct page **pages, unsigned long npages)
{
unsigned long index;

@@ -137,9 +137,9 @@ void put_user_pages(struct page **pages, unsigned long npages)
* single operation to the head page should suffice.
*/
for (index = 0; index < npages; index++)
- put_user_page(pages[index]);
+ unpin_user_page(pages[index]);
}
-EXPORT_SYMBOL(put_user_pages);
+EXPORT_SYMBOL(unpin_user_pages);

#ifdef CONFIG_MMU
static struct page *no_page_table(struct vm_area_struct *vma,
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index fd20ab675b85..de41e830cdac 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -126,8 +126,8 @@ static int process_vm_rw_single_vec(unsigned long addr,
pa += pinned_pages * PAGE_SIZE;

/* If vm_write is set, the pages need to be made dirty: */
- put_user_pages_dirty_lock(process_pages, pinned_pages,
- vm_write);
+ unpin_user_pages_dirty_lock(process_pages, pinned_pages,
+ vm_write);
}

return rc;
diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index d071003b5e76..ac182c38f7b0 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -212,7 +212,7 @@ static int xdp_umem_map_pages(struct xdp_umem *umem)

static void xdp_umem_unpin_pages(struct xdp_umem *umem)
{
- put_user_pages_dirty_lock(umem->pgs, umem->npgs, true);
+ unpin_user_pages_dirty_lock(umem->pgs, umem->npgs, true);

kfree(umem->pgs);
umem->pgs = NULL;
--
2.24.0