From: FUJITA Tomonori <tomo@flapping.org>
To: ojeda@kernel.org, fustini@kernel.org, guoren@kernel.org, wefu@redhat.com
Cc: a.hindborg@kernel.org, acourbot@nvidia.com, aliceryhl@google.com,
bjorn3_gh@protonmail.com, boqun@kernel.org, dakr@kernel.org,
daniel.almeida@collabora.com, gary@garyguo.net,
lossin@kernel.org, tamird@kernel.org, tmgross@umich.edu,
work@onurozkan.dev, rust-for-linux@vger.kernel.org,
linux-riscv@lists.infradead.org,
FUJITA Tomonori <fujita.tomonori@gmail.com>
Subject: [PATCH v1] pwm: th1520: Fix 32-bit build with COMPILE_TEST
Date: Tue, 29 Sep 2026 18:56:12 +0900 [thread overview]
Message-ID: <20260929095612.1072417-1-tomo@flapping.org> (raw)
From: FUJITA Tomonori <fujita.tomonori@gmail.com>
Fix the following build error on 32-bit ARM with COMPILE_TEST:
ERROR: modpost: drivers/pwm/pwm_th1520.ko: symbol '__aeabi_uldivmod' undefined!
The driver divides u64 values when it converts between nanoseconds and
clock cycles. On 32-bit ARM, these divisions are compiled to calls to
__aeabi_uldivmod, which the kernel does not provide.
he TH1520 is a 64-bit RISC-V SoC, so the driver is only used on
64-bit kernels. There is no point in compile testing it on 32-bit.
Limit COMPILE_TEST to 64BIT instead of changing the arithmetic to use
the div64 helpers.
Fixes: 3c180003dffb ("pwm: th1520: Fix missing Kconfig dependencies")
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
---
drivers/pwm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 729776086879..abecd95b0c3c 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -772,7 +772,7 @@ config PWM_TEGRA
config PWM_TH1520
tristate "TH1520 PWM support"
- depends on ARCH_THEAD || COMPILE_TEST
+ depends on ARCH_THEAD || (COMPILE_TEST && 64BIT)
depends on RUST
depends on HAS_IOMEM && COMMON_CLK
select RUST_PWM_ABSTRACTIONS
base-commit: d266640c6c760c9bc215bf5a3ece122ca488b6f5
--
2.43.0
next reply other threads:[~2026-09-29 9:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <8Hw8rFOzHELmQvD7ZIatk1FJqh39-AbzNppa9asPFp0Cp9gFzcQ7zs_34jnuQGt5ukgNPqz0yxdaIyT2SHtACA==@protonmail.internalid>
2026-09-29 9:56 ` FUJITA Tomonori [this message]
2026-09-29 10:24 ` [PATCH v1] pwm: th1520: Fix 32-bit build with COMPILE_TEST Andreas Hindborg
2026-09-29 11:17 ` Gary Guo
2026-09-29 11:54 ` Miguel Ojeda
2026-09-29 12:16 ` FUJITA Tomonori
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