linux-kernel - [PATCH v2 02/14] mm/page_alloc: add helper for checking if check_pages

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: <20230321170513.2401534-3-rppt@kernel.org>
Date:   Tue, 21 Mar 2023 19:05:01 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.com>,
        Doug Berger <opendmb@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v2 02/14] mm/page_alloc: add helper for checking if check_pages_enabled

From: "Mike Rapoport (IBM)" <rppt@...nel.org>

Instead of duplicating long static_branch_enabled(&check_pages_enabled)
wrap it in a helper function is_check_pages_enabled()

Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
Reviewed-by: David Hildenbrand <david@...hat.com>
---
 mm/page_alloc.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 87d760236dba..e1149d54d738 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -245,6 +245,11 @@ EXPORT_SYMBOL(init_on_free);
 /* perform sanity checks on struct pages being allocated or freed */
 static DEFINE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled);
 
+static inline bool is_check_pages_enabled(void)
+{
+	return static_branch_unlikely(&check_pages_enabled);
+}
+
 static bool _init_on_alloc_enabled_early __read_mostly
 				= IS_ENABLED(CONFIG_INIT_ON_ALLOC_DEFAULT_ON);
 static int __init early_init_on_alloc(char *buf)
@@ -1443,7 +1448,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
 		for (i = 1; i < (1 << order); i++) {
 			if (compound)
 				bad += free_tail_pages_check(page, page + i);
-			if (static_branch_unlikely(&check_pages_enabled)) {
+			if (is_check_pages_enabled()) {
 				if (unlikely(free_page_is_bad(page + i))) {
 					bad++;
 					continue;
@@ -1456,7 +1461,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
 		page->mapping = NULL;
 	if (memcg_kmem_online() && PageMemcgKmem(page))
 		__memcg_kmem_uncharge_page(page, order);
-	if (static_branch_unlikely(&check_pages_enabled)) {
+	if (is_check_pages_enabled()) {
 		if (free_page_is_bad(page))
 			bad++;
 		if (bad)
@@ -2366,7 +2371,7 @@ static int check_new_page(struct page *page)
 
 static inline bool check_new_pages(struct page *page, unsigned int order)
 {
-	if (static_branch_unlikely(&check_pages_enabled)) {
+	if (is_check_pages_enabled()) {
 		for (int i = 0; i < (1 << order); i++) {
 			struct page *p = page + i;
 
-- 
2.35.1