mm/khugepaged: trivial typo and codestyle cleanup

Fix some typos and tweak the code to meet codestyle.  No functional change
intended.

Link: https://lkml.kernel.org/r/20220625092816.4856-4-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Zach O'Keefe <zokeefe@google.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: NeilBrown <neilb@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/khugepaged.c

@@ -260,7 +260,7 @@ static ssize_t khugepaged_max_ptes_none_store(struct kobject *kobj,
 	unsigned long max_ptes_none;
 
 	err = kstrtoul(buf, 10, &max_ptes_none);
-	if (err || max_ptes_none > HPAGE_PMD_NR-1)
+	if (err || max_ptes_none > HPAGE_PMD_NR - 1)
 		return -EINVAL;
 
 	khugepaged_max_ptes_none = max_ptes_none;
@@ -286,7 +286,7 @@ static ssize_t khugepaged_max_ptes_swap_store(struct kobject *kobj,
 	unsigned long max_ptes_swap;
 
 	err  = kstrtoul(buf, 10, &max_ptes_swap);
-	if (err || max_ptes_swap > HPAGE_PMD_NR-1)
+	if (err || max_ptes_swap > HPAGE_PMD_NR - 1)
 		return -EINVAL;
 
 	khugepaged_max_ptes_swap = max_ptes_swap;
@@ -313,7 +313,7 @@ static ssize_t khugepaged_max_ptes_shared_store(struct kobject *kobj,
 	unsigned long max_ptes_shared;
 
 	err  = kstrtoul(buf, 10, &max_ptes_shared);
-	if (err || max_ptes_shared > HPAGE_PMD_NR-1)
+	if (err || max_ptes_shared > HPAGE_PMD_NR - 1)
 		return -EINVAL;
 
 	khugepaged_max_ptes_shared = max_ptes_shared;
@@ -599,7 +599,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
 	int none_or_zero = 0, shared = 0, result = 0, referenced = 0;
 	bool writable = false;
 
-	for (_pte = pte; _pte < pte+HPAGE_PMD_NR;
+	for (_pte = pte; _pte < pte + HPAGE_PMD_NR;
 	     _pte++, address += PAGE_SIZE) {
 		pte_t pteval = *_pte;
 		if (pte_none(pteval) || (pte_present(pteval) &&
@@ -1215,7 +1215,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
 
 	memset(khugepaged_node_load, 0, sizeof(khugepaged_node_load));
 	pte = pte_offset_map_lock(mm, pmd, address, &ptl);
-	for (_address = address, _pte = pte; _pte < pte+HPAGE_PMD_NR;
+	for (_address = address, _pte = pte; _pte < pte + HPAGE_PMD_NR;
 	     _pte++, _address += PAGE_SIZE) {
 		pte_t pteval = *_pte;
 		if (is_swap_pte(pteval)) {
@@ -1305,7 +1305,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
 		/*
 		 * Check if the page has any GUP (or other external) pins.
 		 *
-		 * Here the check is racy it may see totmal_mapcount > refcount
+		 * Here the check is racy it may see total_mapcount > refcount
 		 * in some cases.
 		 * For example, one process with one forked child process.
 		 * The parent has the PMD split due to MADV_DONTNEED, then
@@ -1553,7 +1553,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
 		 * mmap_write_lock(mm) as PMD-mapping is likely to be split
 		 * later.
 		 *
-		 * Not that vma->anon_vma check is racy: it can be set up after
+		 * Note that vma->anon_vma check is racy: it can be set up after
 		 * the check but before we took mmap_lock by the fault path.
 		 * But page lock would prevent establishing any new ptes of the
 		 * page, so we are safe.