linux-kernel - [PATCH v1 2/2] mm/highmem: make nr_free

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Message-ID: <20240607083711.62833-3-david@redhat.com>
Date: Fri,  7 Jun 2024 10:37:11 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	David Hildenbrand <david@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH v1 2/2] mm/highmem: make nr_free_highpages() return "unsigned long"

It looks rather weird that totalhigh_pages() returns an
"unsigned long" but nr_free_highpages() returns an "unsigned int".

Let's return an "unsigned long" from nr_free_highpages() to be
consistent.

While at it, use a plain "0" instead of a "0UL" in the !CONFIG_HIGHMEM
totalhigh_pages() implementation, to make these look alike as well.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 include/linux/highmem-internal.h | 8 ++++----
 include/linux/highmem.h          | 2 +-
 mm/highmem.c                     | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/highmem-internal.h b/include/linux/highmem-internal.h
index 65f865fbbac04..dd100e849f5e0 100644
--- a/include/linux/highmem-internal.h
+++ b/include/linux/highmem-internal.h
@@ -131,10 +131,10 @@ static inline void __kunmap_atomic(const void *addr)
 		preempt_enable();
 }
 
-unsigned int __nr_free_highpages(void);
+unsigned long __nr_free_highpages(void);
 unsigned long __totalhigh_pages(void);
 
-static inline unsigned int nr_free_highpages(void)
+static inline unsigned long nr_free_highpages(void)
 {
 	return __nr_free_highpages();
 }
@@ -234,8 +234,8 @@ static inline void __kunmap_atomic(const void *addr)
 		preempt_enable();
 }
 
-static inline unsigned int nr_free_highpages(void) { return 0; }
-static inline unsigned long totalhigh_pages(void) { return 0UL; }
+static inline unsigned long nr_free_highpages(void) { return 0; }
+static inline unsigned long totalhigh_pages(void) { return 0; }
 
 static inline bool is_kmap_addr(const void *x)
 {
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 6b0d6f3c8580c..930a591b9b616 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -179,7 +179,7 @@ static inline void *kmap_local_folio(struct folio *folio, size_t offset);
 static inline void *kmap_atomic(struct page *page);
 
 /* Highmem related interfaces for management code */
-static inline unsigned int nr_free_highpages(void);
+static inline unsigned long nr_free_highpages(void);
 static inline unsigned long totalhigh_pages(void);
 
 #ifndef ARCH_HAS_FLUSH_ANON_PAGE
diff --git a/mm/highmem.c b/mm/highmem.c
index 3c4e9f8c26dcd..1ece1e69031e7 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -111,10 +111,10 @@ static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
 }
 #endif
 
-unsigned int __nr_free_highpages(void)
+unsigned long __nr_free_highpages(void)
 {
+	unsigned long pages = 0;
 	struct zone *zone;
-	unsigned int pages = 0;
 
 	for_each_populated_zone(zone) {
 		if (is_highmem(zone))
-- 
2.45.1