linux-kernel - [PATCH RFC 2/2] mm/cma: Consolidate accounting in dedicated functions

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] [day] [month] [year] [list]

Message-ID: <20251117121502.6db0fd7a@endymion>
Date: Mon, 17 Nov 2025 12:15:02 +0100
From: Jean Delvare <jdelvare@...e.de>
To: linux-mm@...ck.org
Cc: LKML <linux-kernel@...r.kernel.org>, David Hildenbrand
 <david@...hat.com>, Oscar Salvador <osalvador@...e.de>, SeongJae Park
 <sj@...nel.org>
Subject: [PATCH RFC 2/2] mm/cma: Consolidate accounting in dedicated
 functions

Move all accounting to dedicated functions and rename them
accordingly.

Signed-off-by: Jean Delvare <jdelvare@...e.de>
---
This is based on a suggestion by SeongJae Park. Comments welcome.

 mm/cma.c |   43 ++++++++++++++++++-------------------------
 1 file changed, 18 insertions(+), 25 deletions(-)

--- linux-6.17.orig/mm/cma.c
+++ linux-6.17/mm/cma.c
@@ -37,31 +37,27 @@ struct cma cma_areas[MAX_CMA_AREAS];
 unsigned int cma_area_count;
 
 #ifdef CONFIG_SYSFS
-static void cma_sysfs_account_success_pages(struct cma *cma,
-					    unsigned long nr_pages)
+#define cma_inc_page_counter(n, a)	atomic64_add((n), (a))
+#else
+#define cma_inc_page_counter(n, a)	do {} while (0)
+#endif
+
+static void cma_account_success(struct cma *cma, unsigned long nr_pages)
 {
-	atomic64_add(nr_pages, &cma->nr_pages_succeeded);
+	count_vm_event(CMA_ALLOC_SUCCESS);
+	cma_inc_page_counter(nr_pages, &cma->nr_pages_succeeded);
 }
 
-static void cma_sysfs_account_fail_pages(struct cma *cma,
-					 unsigned long nr_pages)
+static void cma_account_fail(struct cma *cma, unsigned long nr_pages)
 {
-	atomic64_add(nr_pages, &cma->nr_pages_failed);
+	count_vm_event(CMA_ALLOC_FAIL);
+	cma_inc_page_counter(nr_pages, &cma->nr_pages_failed);
 }
 
-static void cma_sysfs_account_release_pages(struct cma *cma,
-					    unsigned long nr_pages)
+static void cma_account_release(struct cma *cma, unsigned long nr_pages)
 {
-	atomic64_add(nr_pages, &cma->nr_pages_released);
+	cma_inc_page_counter(nr_pages, &cma->nr_pages_released);
 }
-#else
-static void cma_sysfs_account_success_pages(struct cma *cma,
-					    unsigned long nr_pages) {};
-static void cma_sysfs_account_fail_pages(struct cma *cma,
-					 unsigned long nr_pages) {};
-static void cma_sysfs_account_release_pages(struct cma *cma,
-					    unsigned long nr_pages) {};
-#endif
 
 phys_addr_t cma_get_base(const struct cma *cma)
 {
@@ -921,13 +917,10 @@ static struct page *__cma_alloc(struct c
 	pr_debug("%s(): returned %p\n", __func__, page);
 	trace_cma_alloc_finish(name, page ? page_to_pfn(page) : 0,
 			       page, count, align, ret);
-	if (page) {
-		count_vm_event(CMA_ALLOC_SUCCESS);
-		cma_sysfs_account_success_pages(cma, count);
-	} else {
-		count_vm_event(CMA_ALLOC_FAIL);
-		cma_sysfs_account_fail_pages(cma, count);
-	}
+	if (page)
+		cma_account_success(cma, count);
+	else
+		cma_account_fail(cma, count);
 
 	return page;
 }
@@ -1029,7 +1022,7 @@ bool cma_release(struct cma *cma, const
 
 	free_contig_range(pfn, count);
 	cma_clear_bitmap(cma, cmr, pfn, count);
-	cma_sysfs_account_release_pages(cma, count);
+	cma_account_release(cma, count);
 	trace_cma_release(cma->name, pfn, pages, count);
 
 	return true;

-- 
Jean Delvare
SUSE L3 Support