mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage

Mostly direct substitution with occasional adjustment or removing
outdated comments.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/mincore.c b/mm/mincore.c
index 0eed23d..c0b5ba9 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -211,7 +211,7 @@
  * return values:
  *  zero    - success
  *  -EFAULT - vec points to an illegal address
- *  -EINVAL - addr is not a multiple of PAGE_CACHE_SIZE
+ *  -EINVAL - addr is not a multiple of PAGE_SIZE
  *  -ENOMEM - Addresses in the range [addr, addr + len] are
  *		invalid for the address space of this process, or
  *		specify one or more pages which are not currently
@@ -233,7 +233,7 @@
 	if (!access_ok(VERIFY_READ, (void __user *) start, len))
 		return -ENOMEM;
 
-	/* This also avoids any overflows on PAGE_CACHE_ALIGN */
+	/* This also avoids any overflows on PAGE_ALIGN */
 	pages = len >> PAGE_SHIFT;
 	pages += (offset_in_page(len)) != 0;