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Wed, 30 Sep 2026 06:13:23 -0400 (EDT) From: FUJITA Tomonori To: fustini@kernel.org, guoren@kernel.org, ukleinek@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, linux-riscv@lists.infradead.org, lossin@kernel.org, m.wilczynski@samsung.com, ojeda@kernel.org, tamird@kernel.org, tmgross@umich.edu, work@onurozkan.dev, linux-pwm@vger.kernel.org, rust-for-linux@vger.kernel.org, FUJITA Tomonori , stable@vger.kernel.org Subject: [PATCH v2] pwm: th1520: Fix 32-bit build with COMPILE_TEST Date: Wed, 30 Sep 2026 19:12:57 +0900 Message-ID: <20260930101257.1649945-1-tomo@flapping.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: FUJITA Tomonori 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. The 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") Cc: stable@vger.kernel.org Reported-by: Andreas Hindborg Closes: https://rust-for-linux.zulipchat.com/#narrow/channel/291565-Help/topic/64bit.20division.20in.20.60pwm_th1520.2Ers.60/near/626825599 Reviewed-by: Andreas Hindborg Reviewed-by: Gary Guo Signed-off-by: FUJITA Tomonori --- v2: - Fix a typo in the commit message - Add Cc: stable, Reported-by and Closes tags - Add Reviewed-by tags from Andreas and Gary - Rebase on v7.3-rc5 v1: https://lore.kernel.org/all/20260929095612.1072417-1-tomo@flapping.org/ --- 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: 72d3fcf802c45d00b300f25b848a93c3a2bd7c7e -- 2.43.0