linux-kernel - [PATCH] leds: trigger: ledtrig-cpu:: enforce NR

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Message-Id: <20250620110820.3364008-1-arnd@kernel.org>
Date: Fri, 20 Jun 2025 13:08:15 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Lee Jones <lee@...nel.org>,
	Pavel Machek <pavel@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	Hans de Goede <hansg@...nel.org>,
	linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] leds: trigger: ledtrig-cpu:: enforce NR_CPUS limit in Kconfig

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

This driver fails build testing with larger values of CONFIG_NR_CPUS:

drivers/leds/trigger/ledtrig-cpu.c: In function ‘ledtrig_cpu_init’:
include/linux/compiler_types.h:571:45: error: call to ‘__compiletime_assert_726’ declared with attribute error: BUILD_BUG_ON failed: CONFIG_NR_CPUS > 9999
drivers/leds/trigger/ledtrig-cpu.c:137:9: note: in expansion of macro ‘BUILD_BUG_ON’
  137 |         BUILD_BUG_ON(CONFIG_NR_CPUS > 9999);

Enforce this limit in Kconfig instead to avoid the build failure.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/leds/trigger/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig
index c11282a74b5a..e07bd17cfe35 100644
--- a/drivers/leds/trigger/Kconfig
+++ b/drivers/leds/trigger/Kconfig
@@ -65,6 +65,7 @@ config LEDS_TRIGGER_BACKLIGHT
 config LEDS_TRIGGER_CPU
 	bool "LED CPU Trigger"
 	depends on !PREEMPT_RT
+	depends on NR_CPUS <= 9999
 	help
 	  This allows LEDs to be controlled by active CPUs. This shows
 	  the active CPUs across an array of LEDs so you can see which
-- 
2.39.5