mm/gup: Switch all callers of get_user_pages() to not pass tsk/mm

We will soon modify the vanilla get_user_pages() so it can no
longer be used on mm/tasks other than 'current/current->mm',
which is by far the most common way it is called.  For now,
we allow the old-style calls, but warn when they are used.
(implemented in previous patch)

This patch switches all callers of:

	get_user_pages()
	get_user_pages_unlocked()
	get_user_pages_locked()

to stop passing tsk/mm so they will no longer see the warnings.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: jack@suse.cz
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20160212210156.113E9407@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

29 files changed, 44 insertions, 64 deletions

diff --git a/arch/cris/arch-v32/drivers/cryptocop.c b/arch/cris/arch-v32/drivers/cryptocop.c
index 877da1908234..617645d21b20 100644
--- a/arch/cris/arch-v32/drivers/cryptocop.c
+++ b/arch/cris/arch-v32/drivers/cryptocop.c
@@ -2719,9 +2719,7 @@ static int cryptocop_ioctl_process(struct inode *inode, struct file *filp, unsig
         /* Acquire the mm page semaphore. */
         down_read(&current->mm->mmap_sem);
 
-        err = get_user_pages(current,
-                             current->mm,
-                             (unsigned long int)(oper.indata + prev_ix),
+        err = get_user_pages((unsigned long int)(oper.indata + prev_ix),
                              noinpages,
                              0,  /* read access only for in data */
                              0, /* no force */
@@ -2736,9 +2734,7 @@ static int cryptocop_ioctl_process(struct inode *inode, struct file *filp, unsig
         }
         noinpages = err;
         if (oper.do_cipher){
-                err = get_user_pages(current,
-                                     current->mm,
-                                     (unsigned long int)oper.cipher_outdata,
+                err = get_user_pages((unsigned long int)oper.cipher_outdata,
                                      nooutpages,
                                      1, /* write access for out data */
                                      0, /* no force */
diff --git a/arch/ia64/kernel/err_inject.c b/arch/ia64/kernel/err_inject.c
index 0c161ed6d18e..09f845793d12 100644
--- a/arch/ia64/kernel/err_inject.c
+++ b/arch/ia64/kernel/err_inject.c
@@ -142,8 +142,7 @@ store_virtual_to_phys(struct device *dev, struct device_attribute *attr,
         u64 virt_addr=simple_strtoull(buf, NULL, 16);
         int ret;
 
-        ret = get_user_pages(current, current->mm, virt_addr,
-                        1, VM_READ, 0, NULL, NULL);
+        ret = get_user_pages(virt_addr, 1, VM_READ, 0, NULL, NULL);
         if (ret<=0) {
 #ifdef ERR_INJ_DEBUG
                 printk("Virtual address %lx is not existing.\n",virt_addr);
diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c
index 1afd87c999b0..982e83f9d11f 100644
--- a/arch/mips/mm/gup.c
+++ b/arch/mips/mm/gup.c
@@ -286,8 +286,7 @@ slow_irqon:
         start += nr << PAGE_SHIFT;
         pages += nr;
 
-        ret = get_user_pages_unlocked(current, mm, start,
-                                      (end - start) >> PAGE_SHIFT,
+        ret = get_user_pages_unlocked(start, (end - start) >> PAGE_SHIFT,
                                       write, 0, pages);
 
         /* Have to be a bit careful with return values */
diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index 13dab0c1645c..49a1c84ed266 100644
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -210,7 +210,6 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
                         struct page **pages)
 {
-        struct mm_struct *mm = current->mm;
         int nr, ret;
 
         might_sleep();
@@ -222,8 +221,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
         /* Try to get the remaining pages with get_user_pages */
         start += nr << PAGE_SHIFT;
         pages += nr;
-        ret = get_user_pages_unlocked(current, mm, start,
-                             nr_pages - nr, write, 0, pages);
+        ret = get_user_pages_unlocked(start, nr_pages - nr, write, 0, pages);
         /* Have to be a bit careful with return values */
         if (nr > 0)
                 ret = (ret < 0) ? nr : ret + nr;
diff --git a/arch/sh/mm/gup.c b/arch/sh/mm/gup.c
index e7af6a65baab..40fa6c8adc43 100644
--- a/arch/sh/mm/gup.c
+++ b/arch/sh/mm/gup.c
@@ -257,7 +257,7 @@ slow_irqon:
                 start += nr << PAGE_SHIFT;
                 pages += nr;
 
-                ret = get_user_pages_unlocked(current, mm, start,
+                ret = get_user_pages_unlocked(start,
                         (end - start) >> PAGE_SHIFT, write, 0, pages);
 
                 /* Have to be a bit careful with return values */
diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c
index eb3d8e8ebc6b..4e06750a5d29 100644
--- a/arch/sparc/mm/gup.c
+++ b/arch/sparc/mm/gup.c
@@ -237,7 +237,7 @@ slow:
                 start += nr << PAGE_SHIFT;
                 pages += nr;
 
-                ret = get_user_pages_unlocked(current, mm, start,
+                ret = get_user_pages_unlocked(start,
                         (end - start) >> PAGE_SHIFT, write, 0, pages);
 
                 /* Have to be a bit careful with return values */
diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
index 6d5eb5900372..ce5e4545203b 100644
--- a/arch/x86/mm/gup.c
+++ b/arch/x86/mm/gup.c
@@ -422,7 +422,7 @@ slow_irqon:
                 start += nr << PAGE_SHIFT;
                 pages += nr;
 
-                ret = get_user_pages_unlocked(current, mm, start,
+                ret = get_user_pages_unlocked(start,
                                               (end - start) >> PAGE_SHIFT,
                                               write, 0, pages);
 
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index b2fd67da1701..84fa4a482c78 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -546,8 +546,8 @@ static int mpx_resolve_fault(long __user *addr, int write)
         int nr_pages = 1;
         int force = 0;
 
-        gup_ret = get_user_pages(current, current->mm, (unsigned long)addr,
-                                 nr_pages, write, force, NULL, NULL);
+        gup_ret = get_user_pages((unsigned long)addr, nr_pages, write,
+                        force, NULL, NULL);
         /*
          * get_user_pages() returns number of pages gotten.
          * 0 means we failed to fault in and get anything,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 6442a06d6fdc..5fedfb68d7ca 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -518,8 +518,7 @@ static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
                 uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
                 struct page **pages = ttm->pages + pinned;
 
-                r = get_user_pages(current, current->mm, userptr, num_pages,
-                                   write, 0, pages, NULL);
+                r = get_user_pages(userptr, num_pages, write, 0, pages, NULL);
                 if (r < 0)
                         goto release_pages;
 
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index e34307459e50..927a9f2d6570 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -554,8 +554,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt *ttm)
                 uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
                 struct page **pages = ttm->pages + pinned;
 
-                r = get_user_pages(current, current->mm, userptr, num_pages,
-                                   write, 0, pages, NULL);
+                r = get_user_pages(userptr, num_pages, write, 0, pages, NULL);
                 if (r < 0)
                         goto release_pages;
 
diff --git a/drivers/gpu/drm/via/via_dmablit.c b/drivers/gpu/drm/via/via_dmablit.c
index d0cbd5ecd7f0..e797dfc07ae3 100644
--- a/drivers/gpu/drm/via/via_dmablit.c
+++ b/drivers/gpu/drm/via/via_dmablit.c
@@ -239,8 +239,7 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  drm_via_dmablit_t *xfer)
         if (NULL == vsg->pages)
                 return -ENOMEM;
         down_read(&current->mm->mmap_sem);
-        ret = get_user_pages(current, current->mm,
-                             (unsigned long)xfer->mem_addr,
+        ret = get_user_pages((unsigned long)xfer->mem_addr,
                              vsg->num_pages,
                              (vsg->direction == DMA_FROM_DEVICE),
                              0, vsg->pages, NULL);
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 38acb3cfc545..fe4d2e1a8b58 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -188,7 +188,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
         sg_list_start = umem->sg_head.sgl;
 
         while (npages) {
-                ret = get_user_pages(current, current->mm, cur_base,
+                ret = get_user_pages(cur_base,
                                      min_t(unsigned long, npages,
                                            PAGE_SIZE / sizeof (struct page *)),
                                      1, !umem->writable, page_list, vma_list);
diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c
index 7d2e42dd6926..6c00d04b8b28 100644
--- a/drivers/infiniband/hw/mthca/mthca_memfree.c
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.c
@@ -472,8 +472,7 @@ int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
                 goto out;
         }
 
-        ret = get_user_pages(current, current->mm, uaddr & PAGE_MASK, 1, 1, 0,
-                             pages, NULL);
+        ret = get_user_pages(uaddr & PAGE_MASK, 1, 1, 0, pages, NULL);
         if (ret < 0)
                 goto out;
 
diff --git a/drivers/infiniband/hw/qib/qib_user_pages.c b/drivers/infiniband/hw/qib/qib_user_pages.c
index 74f90b2619f6..2d2b94fd3633 100644
--- a/drivers/infiniband/hw/qib/qib_user_pages.c
+++ b/drivers/infiniband/hw/qib/qib_user_pages.c
@@ -66,8 +66,7 @@ static int __qib_get_user_pages(unsigned long start_page, size_t num_pages,
         }
 
         for (got = 0; got < num_pages; got += ret) {
-                ret = get_user_pages(current, current->mm,
-                                     start_page + got * PAGE_SIZE,
+                ret = get_user_pages(start_page + got * PAGE_SIZE,
                                      num_pages - got, 1, 1,
                                      p + got, NULL);
                 if (ret < 0)
diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c b/drivers/infiniband/hw/usnic/usnic_uiom.c
index 645a5f6e6c88..7209fbc03ccb 100644
--- a/drivers/infiniband/hw/usnic/usnic_uiom.c
+++ b/drivers/infiniband/hw/usnic/usnic_uiom.c
@@ -144,7 +144,7 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
         ret = 0;
 
         while (npages) {
-                ret = get_user_pages(current, current->mm, cur_base,
+                ret = get_user_pages(cur_base,
                                         min_t(unsigned long, npages,
                                         PAGE_SIZE / sizeof(struct page *)),
                                         1, !writable, page_list, NULL);
diff --git a/drivers/media/pci/ivtv/ivtv-udma.c b/drivers/media/pci/ivtv/ivtv-udma.c
index 24152accc66c..4769469fe842 100644
--- a/drivers/media/pci/ivtv/ivtv-udma.c
+++ b/drivers/media/pci/ivtv/ivtv-udma.c
@@ -124,8 +124,8 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
         }
 
         /* Get user pages for DMA Xfer */
-        err = get_user_pages_unlocked(current, current->mm,
-                        user_dma.uaddr, user_dma.page_count, 0, 1, dma->map);
+        err = get_user_pages_unlocked(user_dma.uaddr, user_dma.page_count, 0,
+                        1, dma->map);
 
         if (user_dma.page_count != err) {
                 IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
diff --git a/drivers/media/pci/ivtv/ivtv-yuv.c b/drivers/media/pci/ivtv/ivtv-yuv.c
index 2b8e7b2f2b86..b094054cda6e 100644
--- a/drivers/media/pci/ivtv/ivtv-yuv.c
+++ b/drivers/media/pci/ivtv/ivtv-yuv.c
@@ -75,14 +75,12 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struct ivtv_user_dma *dma,
         ivtv_udma_get_page_info (&uv_dma, (unsigned long)args->uv_source, 360 * uv_decode_height);
 
         /* Get user pages for DMA Xfer */
-        y_pages = get_user_pages_unlocked(current, current->mm,
-                                y_dma.uaddr, y_dma.page_count, 0, 1,
-                                &dma->map[0]);
+        y_pages = get_user_pages_unlocked(y_dma.uaddr,
+                        y_dma.page_count, 0, 1, &dma->map[0]);
         uv_pages = 0; /* silence gcc. value is set and consumed only if: */
         if (y_pages == y_dma.page_count) {
-                uv_pages = get_user_pages_unlocked(current, current->mm,
-                                        uv_dma.uaddr, uv_dma.page_count, 0, 1,
-                                        &dma->map[y_pages]);
+                uv_pages = get_user_pages_unlocked(uv_dma.uaddr,
+                                uv_dma.page_count, 0, 1, &dma->map[y_pages]);
         }
 
         if (y_pages != y_dma.page_count || uv_pages != uv_dma.page_count) {
diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c
index f669cedca8bd..df4c052c6bd6 100644
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf-dma-sg.c
@@ -181,8 +181,7 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
         dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n",
                 data, size, dma->nr_pages);
 
-        err = get_user_pages(current, current->mm,
-                             data & PAGE_MASK, dma->nr_pages,
+        err = get_user_pages(data & PAGE_MASK, dma->nr_pages,
                              rw == READ, 1, /* force */
                              dma->pages, NULL);
 
diff --git a/drivers/misc/mic/scif/scif_rma.c b/drivers/misc/mic/scif/scif_rma.c
index 8310b4dbff06..0fa0d242b295 100644
--- a/drivers/misc/mic/scif/scif_rma.c
+++ b/drivers/misc/mic/scif/scif_rma.c
@@ -1394,8 +1394,6 @@ retry:
                 }
 
                 pinned_pages->nr_pages = get_user_pages(
-                                current,
-                                mm,
                                 (u64)addr,
                                 nr_pages,
                                 !!(prot & SCIF_PROT_WRITE),
diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index f74fc0ca2ef9..a2d97b9b17e3 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -198,8 +198,7 @@ static int non_atomic_pte_lookup(struct vm_area_struct *vma,
 #else
         *pageshift = PAGE_SHIFT;
 #endif
-        if (get_user_pages
-            (current, current->mm, vaddr, 1, write, 0, &page, NULL) <= 0)
+        if (get_user_pages(vaddr, 1, write, 0, &page, NULL) <= 0)
                 return -EFAULT;
         *paddr = page_to_phys(page);
         put_page(page);
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 2e522951b619..664852af4417 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -4817,8 +4817,6 @@ static int sgl_map_user_pages(struct st_buffer *STbp,
         /* Try to fault in all of the necessary pages */
         /* rw==READ means read from drive, write into memory area */
         res = get_user_pages_unlocked(
-                current,
-                current->mm,
                 uaddr,
                 nr_pages,
                 rw == READ,
diff --git a/drivers/video/fbdev/pvr2fb.c b/drivers/video/fbdev/pvr2fb.c
index 0e24eb9c219c..71a923e53f93 100644
--- a/drivers/video/fbdev/pvr2fb.c
+++ b/drivers/video/fbdev/pvr2fb.c
@@ -686,8 +686,8 @@ static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
         if (!pages)
                 return -ENOMEM;
 
-        ret = get_user_pages_unlocked(current, current->mm, (unsigned long)buf,
-                                      nr_pages, WRITE, 0, pages);
+        ret = get_user_pages_unlocked((unsigned long)buf, nr_pages, WRITE,
+                        0, pages);
 
         if (ret < nr_pages) {
                 nr_pages = ret;
diff --git a/drivers/virt/fsl_hypervisor.c b/drivers/virt/fsl_hypervisor.c
index 32c8fc5f7a5c..60bdad3a689b 100644
--- a/drivers/virt/fsl_hypervisor.c
+++ b/drivers/virt/fsl_hypervisor.c
@@ -244,9 +244,8 @@ static long ioctl_memcpy(struct fsl_hv_ioctl_memcpy __user *p)
 
         /* Get the physical addresses of the source buffer */
         down_read(&current->mm->mmap_sem);
-        num_pinned = get_user_pages(current, current->mm,
-                param.local_vaddr - lb_offset, num_pages,
-                (param.source == -1) ? READ : WRITE,
+        num_pinned = get_user_pages(param.local_vaddr - lb_offset,
+                num_pages, (param.source == -1) ? READ : WRITE,
                 0, pages, NULL);
         up_read(&current->mm->mmap_sem);
 
diff --git a/mm/frame_vector.c b/mm/frame_vector.c
index 7cf2b7163222..381bb07ed14f 100644
--- a/mm/frame_vector.c
+++ b/mm/frame_vector.c
@@ -58,7 +58,7 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
         if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) {
                 vec->got_ref = true;
                 vec->is_pfns = false;
-                ret = get_user_pages_locked(current, mm, start, nr_frames,
+                ret = get_user_pages_locked(start, nr_frames,
                         write, force, (struct page **)(vec->ptrs), &locked);
                 goto out;
         }
diff --git a/mm/gup.c b/mm/gup.c
index 8a035e042b35..de24ef4cd1af 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -936,8 +936,10 @@ long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
 EXPORT_SYMBOL(get_user_pages_remote);
 
 /*
- * This is the same as get_user_pages_remote() for the time
- * being.
+ * This is the same as get_user_pages_remote(), just with a
+ * less-flexible calling convention where we assume that the task
+ * and mm being operated on are the current task's.  We also
+ * obviously don't pass FOLL_REMOTE in here.
  */
 long get_user_pages6(unsigned long start, unsigned long nr_pages,
                 int write, int force, struct page **pages,
diff --git a/mm/ksm.c b/mm/ksm.c
index ca6d2a06a615..c2013f638d11 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -352,7 +352,7 @@ static inline bool ksm_test_exit(struct mm_struct *mm)
 /*
  * We use break_ksm to break COW on a ksm page: it's a stripped down
  *
- *      if (get_user_pages(current, mm, addr, 1, 1, 1, &page, NULL) == 1)
+ *      if (get_user_pages(addr, 1, 1, 1, &page, NULL) == 1)
  *              put_page(page);
  *
  * but taking great care only to touch a ksm page, in a VM_MERGEABLE vma,
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 4c4187c0e1de..dd0ce7fbd47b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -844,12 +844,12 @@ static void get_policy_nodemask(struct mempolicy *p, nodemask_t *nodes)
         }
 }
 
-static int lookup_node(struct mm_struct *mm, unsigned long addr)
+static int lookup_node(unsigned long addr)
 {
         struct page *p;
         int err;
 
-        err = get_user_pages(current, mm, addr & PAGE_MASK, 1, 0, 0, &p, NULL);
+        err = get_user_pages(addr & PAGE_MASK, 1, 0, 0, &p, NULL);
         if (err >= 0) {
                 err = page_to_nid(p);
                 put_page(p);
@@ -904,7 +904,7 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask,
 
         if (flags & MPOL_F_NODE) {
                 if (flags & MPOL_F_ADDR) {
-                        err = lookup_node(mm, addr);
+                        err = lookup_node(addr);
                         if (err < 0)
                                 goto out;
                         *policy = err;
diff --git a/net/ceph/pagevec.c b/net/ceph/pagevec.c
index d4f5f220a8e5..10297f7a89ba 100644
--- a/net/ceph/pagevec.c
+++ b/net/ceph/pagevec.c
@@ -24,7 +24,7 @@ struct page **ceph_get_direct_page_vector(const void __user *data,
                 return ERR_PTR(-ENOMEM);
 
         while (got < num_pages) {
-                rc = get_user_pages_unlocked(current, current->mm,
+                rc = get_user_pages_unlocked(
                     (unsigned long)data + ((unsigned long)got * PAGE_SIZE),
                     num_pages - got, write_page, 0, pages + got);
                 if (rc < 0)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a11cfd20a6a0..0253ad900ec3 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1264,15 +1264,16 @@ unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *w
         return gfn_to_hva_memslot_prot(slot, gfn, writable);
 }
 
-static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
-        unsigned long start, int write, struct page **page)
+static int get_user_page_nowait(unsigned long start, int write,
+                struct page **page)
 {
         int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
 
         if (write)
                 flags |= FOLL_WRITE;
 
-        return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
+        return __get_user_pages(current, current->mm, start, 1, flags, page,
+                        NULL, NULL);
 }
 
 static inline int check_user_page_hwpoison(unsigned long addr)
@@ -1334,8 +1335,7 @@ static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
 
         if (async) {
                 down_read(&current->mm->mmap_sem);
-                npages = get_user_page_nowait(current, current->mm,
-                                              addr, write_fault, page);
+                npages = get_user_page_nowait(addr, write_fault, page);
                 up_read(&current->mm->mmap_sem);
         } else
                 npages = __get_user_pages_unlocked(current, current->mm, addr, 1,