Merge branch 'akpm' (patches from Andrew)

Merge even more updates from Andrew Morton:

 - a kernel-wide sweep of show_stack()

 - pagetable cleanups

 - abstract out accesses to mmap_sem - prep for mmap_sem scalability work

 - hch's user acess work

Subsystems affected by this patch series: debug, mm/pagemap, mm/maccess,
mm/documentation.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (93 commits)
  include/linux/cache.h: expand documentation over __read_mostly
  maccess: return -ERANGE when probe_kernel_read() fails
  x86: use non-set_fs based maccess routines
  maccess: allow architectures to provide kernel probing directly
  maccess: move user access routines together
  maccess: always use strict semantics for probe_kernel_read
  maccess: remove strncpy_from_unsafe
  tracing/kprobes: handle mixed kernel/userspace probes better
  bpf: rework the compat kernel probe handling
  bpf:bpf_seq_printf(): handle potentially unsafe format string better
  bpf: handle the compat string in bpf_trace_copy_string better
  bpf: factor out a bpf_trace_copy_string helper
  maccess: unify the probe kernel arch hooks
  maccess: remove probe_read_common and probe_write_common
  maccess: rename strnlen_unsafe_user to strnlen_user_nofault
  maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_nofault
  maccess: rename strncpy_from_unsafe_user to strncpy_from_user_nofault
  maccess: update the top of file comment
  maccess: clarify kerneldoc comments
  maccess: remove duplicate kerneldoc comments
  ...

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c
index 13b65ed9e74c..46ff19df9f53 100644
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf-dma-sg.c
@@ -21,13 +21,13 @@
 #include <linux/sched/mm.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
+#include <linux/pgtable.h>
 
 #include <linux/dma-mapping.h>
 #include <linux/vmalloc.h>
 #include <linux/pagemap.h>
 #include <linux/scatterlist.h>
 #include <asm/page.h>
-#include <asm/pgtable.h>
 
 #include <media/videobuf-dma-sg.h>
 
@@ -200,9 +200,9 @@ static int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
 {
 	int ret;
 
-	down_read(&current->mm->mmap_sem);
+	mmap_read_lock(current->mm);
 	ret = videobuf_dma_init_user_locked(dma, direction, data, size);
-	up_read(&current->mm->mmap_sem);
+	mmap_read_unlock(current->mm);
 
 	return ret;
 }
@@ -533,7 +533,7 @@ static int __videobuf_iolock(struct videobuf_queue *q,
 		} else {
 			/* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
 			buffers can only be called from videobuf_qbuf
-			we take current->mm->mmap_sem there, to prevent
+			we take current->mm->mmap_lock there, to prevent
 			locking inversion, so don't take it here */
 
 			err = videobuf_dma_init_user_locked(&mem->dma,