On Thu, May 07, 2026 at 04:21:31PM -0700, Rosen Penev wrote:
> A MIPS allmodconfig build with LLVM fails during modpost:
> 
>   ERROR: modpost: "__udivdi3"
>   [sound/soc/tegra/snd-soc-tegra210-mixer.ko] undefined!
> 
> tegra210_mixer_configure_gain() divides a 64-bit BIT_ULL() value by the
> fade duration. On 32-bit MIPS, clang emits a call to __udivdi3 for that
> plain C division, but that compiler helper is not exported to modules.
> 
> Use div_u64() for the inverse duration calculation so the driver uses the
> kernel's 64-bit division helper instead of emitting a compiler runtime
> call.
> 
> Assisted-by: Codex:GPT-5.5
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
> ---
>  sound/soc/tegra/tegra210_mixer.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

Acked-by: Thierry Reding <treding@nvidia.com>