linux-kernel - [PATCH] mm/cma: Make MAX_CMA_AREAS = CONFIG_CMA

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Date: Mon,  5 Feb 2024 10:49:29 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mm/cma: Make MAX_CMA_AREAS = CONFIG_CMA_AREAS

There is no real difference between the global area, and other additionally
configured CMA areas via CONFIG_CMA_AREAS that always defaults without user
input. This makes MAX_CMA_AREAS same as CONFIG_CMA_AREAS, also incrementing
its default values, thus maintaining current default for MAX_CMA_AREAS both
for UMA and NUMA systems.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 include/linux/cma.h | 6 +-----
 mm/Kconfig          | 6 +++---
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/include/linux/cma.h b/include/linux/cma.h
index 63873b93deaa..9db877506ea8 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -6,12 +6,8 @@
 #include <linux/types.h>
 #include <linux/numa.h>
 
-/*
- * There is always at least global CMA area and a few optional
- * areas configured in kernel .config.
- */
 #ifdef CONFIG_CMA_AREAS
-#define MAX_CMA_AREAS	(1 + CONFIG_CMA_AREAS)
+#define MAX_CMA_AREAS	CONFIG_CMA_AREAS
 #endif
 
 #define CMA_MAX_NAME 64
diff --git a/mm/Kconfig b/mm/Kconfig
index 35fa9940e61f..88ba99d84ac3 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -917,14 +917,14 @@ config CMA_SYSFS
 config CMA_AREAS
 	int "Maximum count of the CMA areas"
 	depends on CMA
-	default 19 if NUMA
-	default 7
+	default 20 if NUMA
+	default 8
 	help
 	  CMA allows to create CMA areas for particular purpose, mainly,
 	  used as device private area. This parameter sets the maximum
 	  number of CMA area in the system.
 
-	  If unsure, leave the default value "7" in UMA and "19" in NUMA.
+	  If unsure, leave the default value "8" in UMA and "20" in NUMA.
 
 config MEM_SOFT_DIRTY
 	bool "Track memory changes"
-- 
2.25.1