linux-kernel - [PATCH v1] pinctrl: mpfs-iomux0: fix compile-time constant warning for LLVM prior to 17

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251029-isolation-shield-b66aea79a9a4@spud>
Date: Wed, 29 Oct 2025 15:29:35 +0000
From: Conor Dooley <conor@...nel.org>
To: linux-gpio@...r.kernel.org
Cc: conor@...nel.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Daire McNamara <daire.mcnamara@...rochip.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH v1] pinctrl: mpfs-iomux0: fix compile-time constant warning for LLVM prior to 17

From: Conor Dooley <conor.dooley@...rochip.com>

With LLVM prior to 17.0.0:

drivers/pinctrl/pinctrl-mpfs-iomux0.c:89:2: error: initializer element is not a compile-time constant
        MPFS_IOMUX0_GROUP(spi0),
        ^~~~~~~~~~~~~~~~~~~~~~~
drivers/pinctrl/pinctrl-mpfs-iomux0.c:79:10: note: expanded from macro 'MPFS_IOMUX0_GROUP'
        .mask = BIT(mpfs_iomux0_##_name##_pins[0]),     \
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:19: note: expanded from macro 'BIT'
\#define BIT(nr)                 (UL(1) << (nr))
                                ^~~~~~~~~~~~~~~

This is a constant, but LLVM prior to a change from Nick to match the
gcc behaviour did not allow this. The macro isn't really all that much
of an idiot-proofing, just change it to the same sort that's in the
gpio2 driver, where a second argument provides the mask/setting.

Reported-by: Nathan Chancellor <nathan@...nel.org>
Link: https://github.com/ClangBuiltLinux/linux/issues/2140
Fixes: 46397274da22 ("pinctrl: add polarfire soc iomux0 pinmux driver")
Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---

Not entirely sold on the fixes tag since it's to shut up an old
compiler, but no harm in it I guess.

CC: Conor Dooley <conor.dooley@...rochip.com>
CC: Daire McNamara <daire.mcnamara@...rochip.com>
CC: Linus Walleij <linus.walleij@...aro.org>
CC: Nathan Chancellor <nathan@...nel.org>
CC: Nick Desaulniers <nick.desaulniers+lkml@...il.com>
CC: Bill Wendling <morbo@...gle.com>
CC: Justin Stitt <justinstitt@...gle.com>
CC: linux-riscv@...ts.infradead.org
CC: linux-gpio@...r.kernel.org
CC: linux-kernel@...r.kernel.org
CC: llvm@...ts.linux.dev
---
 drivers/pinctrl/pinctrl-mpfs-iomux0.c | 36 +++++++++++++--------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-mpfs-iomux0.c b/drivers/pinctrl/pinctrl-mpfs-iomux0.c
index 49d9fcec0a16..cf5b2e4e8f5b 100644
--- a/drivers/pinctrl/pinctrl-mpfs-iomux0.c
+++ b/drivers/pinctrl/pinctrl-mpfs-iomux0.c
@@ -73,33 +73,33 @@ static const unsigned int mpfs_iomux0_uart4_pins[] = { 11 };
 static const unsigned int mpfs_iomux0_mdio0_pins[] = { 12 };
 static const unsigned int mpfs_iomux0_mdio1_pins[] = { 13 };
 
-#define MPFS_IOMUX0_GROUP(_name) { \
+#define MPFS_IOMUX0_GROUP(_name, _mask) { \
 	.name = #_name "_mssio",	\
 	.pins = mpfs_iomux0_##_name##_pins,	\
-	.mask = BIT(mpfs_iomux0_##_name##_pins[0]),	\
+	.mask = _mask,	\
 	.setting = 0x0,	\
 }, { \
 	.name = #_name "_fabric",	\
 	.pins = mpfs_iomux0_##_name##_pins,	\
-	.mask = BIT(mpfs_iomux0_##_name##_pins[0]),	\
-	.setting = BIT(mpfs_iomux0_##_name##_pins[0]),	\
+	.mask = _mask,	\
+	.setting = _mask,	\
 }
 
 static const struct mpfs_iomux0_pin_group mpfs_iomux0_pin_groups[] = {
-	MPFS_IOMUX0_GROUP(spi0),
-	MPFS_IOMUX0_GROUP(spi1),
-	MPFS_IOMUX0_GROUP(i2c0),
-	MPFS_IOMUX0_GROUP(i2c1),
-	MPFS_IOMUX0_GROUP(can0),
-	MPFS_IOMUX0_GROUP(can1),
-	MPFS_IOMUX0_GROUP(qspi),
-	MPFS_IOMUX0_GROUP(uart0),
-	MPFS_IOMUX0_GROUP(uart1),
-	MPFS_IOMUX0_GROUP(uart2),
-	MPFS_IOMUX0_GROUP(uart3),
-	MPFS_IOMUX0_GROUP(uart4),
-	MPFS_IOMUX0_GROUP(mdio0),
-	MPFS_IOMUX0_GROUP(mdio1),
+	MPFS_IOMUX0_GROUP(spi0, BIT(0)),
+	MPFS_IOMUX0_GROUP(spi1, BIT(1)),
+	MPFS_IOMUX0_GROUP(i2c0, BIT(2)),
+	MPFS_IOMUX0_GROUP(i2c1, BIT(3)),
+	MPFS_IOMUX0_GROUP(can0, BIT(4)),
+	MPFS_IOMUX0_GROUP(can1, BIT(5)),
+	MPFS_IOMUX0_GROUP(qspi, BIT(6)),
+	MPFS_IOMUX0_GROUP(uart0, BIT(7)),
+	MPFS_IOMUX0_GROUP(uart1, BIT(8)),
+	MPFS_IOMUX0_GROUP(uart2, BIT(9)),
+	MPFS_IOMUX0_GROUP(uart3, BIT(10)),
+	MPFS_IOMUX0_GROUP(uart4, BIT(11)),
+	MPFS_IOMUX0_GROUP(mdio0, BIT(12)),
+	MPFS_IOMUX0_GROUP(mdio1, BIT(13)),
 };
 
 static const char * const mpfs_iomux0_spi0_groups[] = { "spi0_mssio", "spi0_fabric" };
-- 
2.51.0