linux-kernel - Re: [PATCH v4 1/2] dmaengine: tegra210-adma: Fix build error due to 64-by-32 division

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Message-ID: <t3ml2g4vvdbgtf446z75kii7c7fqc5ogjwvstult2wzktq3zyk@ztsd3o3elxcf>
Date: Wed, 5 Feb 2025 14:25:14 +0100
From: Thierry Reding <thierry.reding@...il.com>
To: Mohan Kumar D <mkumard@...dia.com>
Cc: vkoul@...nel.org, jonathanh@...dia.com, dmaengine@...r.kernel.org, 
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v4 1/2] dmaengine: tegra210-adma: Fix build error due to
 64-by-32 division

On Wed, Feb 05, 2025 at 09:01:30AM +0530, Mohan Kumar D wrote:
> Kernel test robot reported the build errors on 32-bit platforms due to
> plain 64-by-32 division. Following build erros were reported.
> 
>    "ERROR: modpost: "__udivdi3" [drivers/dma/tegra210-adma.ko] undefined!
>     ld: drivers/dma/tegra210-adma.o: in function `tegra_adma_probe':
>     tegra210-adma.c:(.text+0x12cf): undefined reference to `__udivdi3'"
> 
> This can be fixed by using div_u64() for the adma address space
> 
> Fixes: 68811c928f88 ("dmaengine: tegra210-adma: Support channel page")
> Cc: stable@...r.kernel.org
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202412250204.GCQhdKe3-lkp@intel.com/
> Signed-off-by: Mohan Kumar D <mkumard@...dia.com>
> ---
>  drivers/dma/tegra210-adma.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)

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

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