From: Andreas Hindborg <a.hindborg@kernel.org>
To: FUJITA Tomonori <tomo@flapping.org>,
ojeda@kernel.org, fustini@kernel.org, guoren@kernel.org,
wefu@redhat.com
Cc: 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: Re: [PATCH v1] pwm: th1520: Fix 32-bit build with COMPILE_TEST
Date: Tue, 29 Sep 2026 12:24:38 +0200 [thread overview]
Message-ID: <875wzotkwp.fsf@t14s.mail-host-address-is-not-set> (raw)
In-Reply-To: <20260929095612.1072417-1-tomo@flapping.org>
"FUJITA Tomonori" <tomo@flapping.org> writes:
> 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>
Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Best regards,
Andreas Hindborg
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next prev parent reply other threads:[~2026-09-29 10:25 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 ` [PATCH v1] pwm: th1520: Fix 32-bit build with COMPILE_TEST FUJITA Tomonori
2026-09-29 10:24 ` Andreas Hindborg [this message]
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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