linux-kernel - [PATCH next] mux: fix build-error when mux-core is built as module

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Message-Id: <20260209-rz-sdio-mux-fix-v1-1-8ea0da565b14@solid-run.com>
Date: Mon, 09 Feb 2026 13:24:31 +0200
From: Josua Mayer <josua@...id-run.com>
To: Peter Rosin <peda@...ntia.se>,
 Wolfram Sang <wsa+renesas@...g-engineering.com>,
 Ulf Hansson <ulf.hansson@...aro.org>
Cc: linux-kernel@...r.kernel.org, Josua Mayer <josua@...id-run.com>
Subject: [PATCH next] mux: fix build-error when mux-core is built as module

The mux core header file uses ifdef CONFIG_MULTIPLEXER to select between
helper function prototypes and static inline stubs.

This leads to build errors when CONFIG_MULTIPLEXER=m, because then
CONFIG_MULTIPLEXER_MODULE is defined instead.

Replace the ifdef with IS_ENABLED to catch both builtin and module
cases, and fix the build error in module case.

Fixes: ad314348ceb4 ("mux: Add helper functions for getting optional and selected mux-state")
Signed-off-by: Josua Mayer <josua@...id-run.com>
---
 include/linux/mux/consumer.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mux/consumer.h b/include/linux/mux/consumer.h
index 3ede55b907eb..a961861a503b 100644
--- a/include/linux/mux/consumer.h
+++ b/include/linux/mux/consumer.h
@@ -16,7 +16,7 @@ struct device;
 struct mux_control;
 struct mux_state;
 
-#ifdef CONFIG_MULTIPLEXER
+#if IS_ENABLED(CONFIG_MULTIPLEXER)
 
 unsigned int mux_control_states(struct mux_control *mux);
 int __must_check mux_control_select_delay(struct mux_control *mux,

---
base-commit: 13dc45d829d5ae06f6eee3fbd3cd1f6818c08e48
change-id: 20260209-rz-sdio-mux-fix-e8fa9c62ff95

Best regards,
-- 
Josua Mayer <josua@...id-run.com>