Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:
 "The remainder of the main mm/ queue.

  143 patches.

  Subsystems affected by this patch series (all mm): pagecache, hugetlb,
  userfaultfd, vmscan, compaction, migration, cma, ksm, vmstat, mmap,
  kconfig, util, memory-hotplug, zswap, zsmalloc, highmem, cleanups, and
  kfence"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (143 commits)
  kfence: use power-efficient work queue to run delayed work
  kfence: maximize allocation wait timeout duration
  kfence: await for allocation using wait_event
  kfence: zero guard page after out-of-bounds access
  mm/process_vm_access.c: remove duplicate include
  mm/mempool: minor coding style tweaks
  mm/highmem.c: fix coding style issue
  btrfs: use memzero_page() instead of open coded kmap pattern
  iov_iter: lift memzero_page() to highmem.h
  mm/zsmalloc: use BUG_ON instead of if condition followed by BUG.
  mm/zswap.c: switch from strlcpy to strscpy
  arm64/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
  x86/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
  mm,memory_hotplug: add kernel boot option to enable memmap_on_memory
  acpi,memhotplug: enable MHP_MEMMAP_ON_MEMORY when supported
  mm,memory_hotplug: allocate memmap from the added memory range
  mm,memory_hotplug: factor out adjusting present pages into adjust_present_page_count()
  mm,memory_hotplug: relax fully spanned sections check
  drivers/base/memory: introduce memory_block_{online,offline}
  mm/memory_hotplug: remove broken locking of zone PCP structures during hot remove
  ...

1 files changed, 4 insertions, 20 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 5be57ba01d33..7fadf211643c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -142,17 +142,6 @@ static void page_cache_delete(struct address_space *mapping,
 
 	page->mapping = NULL;
 	/* Leave page->index set: truncation lookup relies upon it */
-
-	if (shadow) {
-		mapping->nrexceptional += nr;
-		/*
-		 * Make sure the nrexceptional update is committed before
-		 * the nrpages update so that final truncate racing
-		 * with reclaim does not see both counters 0 at the
-		 * same time and miss a shadow entry.
-		 */
-		smp_wmb();
-	}
 	mapping->nrpages -= nr;
 }
 
@@ -629,9 +618,6 @@ EXPORT_SYMBOL(filemap_fdatawait_keep_errors);
 /* Returns true if writeback might be needed or already in progress. */
 static bool mapping_needs_writeback(struct address_space *mapping)
 {
-	if (dax_mapping(mapping))
-		return mapping->nrexceptional;
-
 	return mapping->nrpages;
 }
 
@@ -925,8 +911,6 @@ noinline int __add_to_page_cache_locked(struct page *page,
 		if (xas_error(&xas))
 			goto unlock;
 
-		if (old)
-			mapping->nrexceptional--;
 		mapping->nrpages++;
 
 		/* hugetlb pages do not participate in page cache accounting */
@@ -3283,7 +3267,7 @@ const struct vm_operations_struct generic_file_vm_ops = {
 
 /* This is used for a general mmap of a disk file */
 
-int generic_file_mmap(struct file * file, struct vm_area_struct * vma)
+int generic_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct address_space *mapping = file->f_mapping;
 
@@ -3308,11 +3292,11 @@ vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf)
 {
 	return VM_FAULT_SIGBUS;
 }
-int generic_file_mmap(struct file * file, struct vm_area_struct * vma)
+int generic_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	return -ENOSYS;
 }
-int generic_file_readonly_mmap(struct file * file, struct vm_area_struct * vma)
+int generic_file_readonly_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	return -ENOSYS;
 }
@@ -3740,7 +3724,7 @@ EXPORT_SYMBOL(generic_perform_write);
 ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
 	struct file *file = iocb->ki_filp;
-	struct address_space * mapping = file->f_mapping;
+	struct address_space *mapping = file->f_mapping;
 	struct inode 	*inode = mapping->host;
 	ssize_t		written = 0;
 	ssize_t		err;