linux-kernel - [PATCH v1 2/2] mm: simplify free_highmem_page() and free_reserved

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210126182113.19892-3-david@redhat.com>
Date:   Tue, 26 Jan 2021 19:21:13 +0100
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Mike Rapoport <rppt@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...nel.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>
Subject: [PATCH v1 2/2] mm: simplify free_highmem_page() and free_reserved_page()

adjust_managed_page_count() as called by free_reserved_page() properly
handles pages in a highmem zone, so we can reuse it for
free_highmem_page().

We can now get rid of totalhigh_pages_inc() and simplify
free_reserved_page().

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: Oscar Salvador <osalvador@...e.de>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 include/linux/highmem-internal.h |  5 -----
 include/linux/mm.h               | 16 ++--------------
 mm/page_alloc.c                  | 11 -----------
 3 files changed, 2 insertions(+), 30 deletions(-)

diff --git a/include/linux/highmem-internal.h b/include/linux/highmem-internal.h
index 1bbe96dc8be6..7902c7d8b55f 100644
--- a/include/linux/highmem-internal.h
+++ b/include/linux/highmem-internal.h
@@ -127,11 +127,6 @@ static inline unsigned long totalhigh_pages(void)
 	return (unsigned long)atomic_long_read(&_totalhigh_pages);
 }
 
-static inline void totalhigh_pages_inc(void)
-{
-	atomic_long_inc(&_totalhigh_pages);
-}
-
 static inline void totalhigh_pages_add(long count)
 {
 	atomic_long_add(count, &_totalhigh_pages);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index a5d618d08506..494c69433a34 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2303,32 +2303,20 @@ extern void free_initmem(void);
 extern unsigned long free_reserved_area(void *start, void *end,
 					int poison, const char *s);
 
-#ifdef	CONFIG_HIGHMEM
-/*
- * Free a highmem page into the buddy system, adjusting totalhigh_pages
- * and totalram_pages.
- */
-extern void free_highmem_page(struct page *page);
-#endif
-
 extern void adjust_managed_page_count(struct page *page, long count);
 extern void mem_init_print_info(const char *str);
 
 extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end);
 
 /* Free the reserved page into the buddy system, so it gets managed. */
-static inline void __free_reserved_page(struct page *page)
+static inline void free_reserved_page(struct page *page)
 {
 	ClearPageReserved(page);
 	init_page_count(page);
 	__free_page(page);
-}
-
-static inline void free_reserved_page(struct page *page)
-{
-	__free_reserved_page(page);
 	adjust_managed_page_count(page, 1);
 }
+#define free_highmem_page(page) free_reserved_page(page)
 
 static inline void mark_page_reserved(struct page *page)
 {
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b031a5ae0bd5..b2e42f10d4d4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7711,17 +7711,6 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
 	return pages;
 }
 
-#ifdef	CONFIG_HIGHMEM
-void free_highmem_page(struct page *page)
-{
-	__free_reserved_page(page);
-	totalram_pages_inc();
-	atomic_long_inc(&page_zone(page)->managed_pages);
-	totalhigh_pages_inc();
-}
-#endif
-
-
 void __init mem_init_print_info(const char *str)
 {
 	unsigned long physpages, codesize, datasize, rosize, bss_size;
-- 
2.29.2