linux-kernel - [PATCH 10/10] [RESEND 3] dma/contiguous: avoid warning about unused size

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Message-Id: <20250409122441.2875424-1-arnd@kernel.org>
Date: Wed,  9 Apr 2025 14:24:33 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Arnd Bergmann <arnd@...db.de>,
	Kyungmin Park <kyungmin.park@...sung.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Robin Murphy <robin.murphy@....com>,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 10/10] [RESEND 3] dma/contiguous: avoid warning about unused size_bytes

From: Arnd Bergmann <arnd@...db.de>

When building with W=1, this variable is unused for configs with
CONFIG_CMA_SIZE_SEL_PERCENTAGE=y:

kernel/dma/contiguous.c:67:26: error: 'size_bytes' defined but not used [-Werror=unused-const-variable=]

Change this to a macro to avoid the warning.

Fixes: c64be2bb1c6e ("drivers: add Contiguous Memory Allocator")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v3: use a macro instead of constant
v2: fix spelling mistake.
---
 kernel/dma/contiguous.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
index 055da410ac71..88888f4c1c73 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -64,8 +64,7 @@ struct cma *dma_contiguous_default_area;
  * Users, who want to set the size of global CMA area for their system
  * should use cma= kernel parameter.
  */
-static const phys_addr_t size_bytes __initconst =
-	(phys_addr_t)CMA_SIZE_MBYTES * SZ_1M;
+#define size_bytes (CMA_SIZE_MBYTES * SZ_1M)
 static phys_addr_t  size_cmdline __initdata = -1;
 static phys_addr_t base_cmdline __initdata;
 static phys_addr_t limit_cmdline __initdata;
-- 
2.39.5