When using the _SMC_KEY macro in switch/case statements, GCC 15.2.1 errors
out with 'case label does not reduce to an integer constant'. Introduce
a new __SMC_KEY macro that can be used instead.

Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
---
 include/linux/mfd/macsmc.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/mfd/macsmc.h b/include/linux/mfd/macsmc.h
index 6b13f01a8592..f6f80c33b5cf 100644
--- a/include/linux/mfd/macsmc.h
+++ b/include/linux/mfd/macsmc.h
@@ -41,6 +41,7 @@ typedef u32 smc_key;
  */
 #define SMC_KEY(s) (smc_key)(_SMC_KEY(#s))
 #define _SMC_KEY(s) (((s)[0] << 24) | ((s)[1] << 16) | ((s)[2] << 8) | (s)[3])
+#define __SMC_KEY(a, b, c, d) (((u32)(a) << 24) | ((u32)(b) << 16) | ((u32)(c) << 8) | ((u32)(d)))
 
 #define APPLE_SMC_READABLE BIT(7)
 #define APPLE_SMC_WRITABLE BIT(6)

-- 
2.51.0

On Sat, 25 Oct 2025 10:24:36 +1000, James Calligeros wrote:
> When using the _SMC_KEY macro in switch/case statements, GCC 15.2.1 errors
> out with 'case label does not reduce to an integer constant'. Introduce
> a new __SMC_KEY macro that can be used instead.
> 
> 

Applied, thanks!

[05/11] mfd: macsmc: Add new __SMC_KEY macro
        commit: 8c3290b4c975e35a01aecfb51e0e004b6f7c0480

--
Lee Jones [李琼斯]