linux-kernel - [PATCH next 03/14] media: videobuf2-core: Use static

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Message-Id: <20260121145731.3623-4-david.laight.linux@gmail.com>
Date: Wed, 21 Jan 2026 14:57:20 +0000
From: david.laight.linux@...il.com
To: Nathan Chancellor <nathan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yury Norov <yury.norov@...il.com>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tomasz Figa <tfiga@...omium.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Cc: David Laight <david.laight.linux@...il.com>
Subject: [PATCH next 03/14] media: videobuf2-core: Use static_assert() for sanity check

From: David Laight <david.laight.linux@...il.com>

Compile-time tests being added to BIT() make it an 'integer constant
expression' rather than a pre-processor expression for W=1 builds.

Change the BIT(PLANE_INDEX_BITS) != VIDEO_MAX_PLANES test to use
static_assert() so the code compiles.

Signed-off-by: David Laight <david.laight.linux@...il.com>
---
 drivers/media/common/videobuf2/videobuf2-core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 2df566f409b6..90dedab2aeb2 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -37,9 +37,9 @@
 #define MAX_BUFFER_INDEX	BIT_MASK(30 - PLANE_INDEX_SHIFT)
 #define BUFFER_INDEX_MASK	(MAX_BUFFER_INDEX - 1)
 
-#if BIT(PLANE_INDEX_BITS) != VIDEO_MAX_PLANES
-#error PLANE_INDEX_BITS order must be equal to VIDEO_MAX_PLANES
-#endif
+
+static_assert(BIT(PLANE_INDEX_BITS) == VIDEO_MAX_PLANES,
+	      "PLANE_INDEX_BITS order must be equal to VIDEO_MAX_PLANES");
 
 static int debug;
 module_param(debug, int, 0644);
-- 
2.39.5