linux-kernel - Re: [PATCH] clk: sophgo: avoid open-coded 64-bit division

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Message-ID: <ba929890d6c6fbdb78f3aa8d9b761184.sboyd@kernel.org>
Date: Fri, 19 Apr 2024 14:38:27 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>, Chen Wang <unicorn_wang@...look.com>, Inochi Amaoto <inochiama@...look.com>, Michael Turquette <mturquette@...libre.com>
Cc: Arnd Bergmann <arnd@...db.de>, linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: sophgo: avoid open-coded 64-bit division

Quoting Arnd Bergmann (2024-04-15 06:45:20)
> From: Arnd Bergmann <arnd@...db.de>
> 
> On 32-bit architectures, the 64-bit division leads to a link failure:
> 
> arm-linux-gnueabi-ld: drivers/clk/sophgo/clk-cv18xx-pll.o: in function `fpll_calc_rate':
> clk-cv18xx-pll.c:(.text.fpll_calc_rate+0x26): undefined reference to `__aeabi_uldivmod'
> 
> This one is not called in a fast path, and there is already another div_u64()
> variant used in the same function, so convert it to div64_u64_rem().
> 
> Fixes: 80fd61ec4612 ("clk: sophgo: Add clock support for CV1800 SoC")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Applied to clk-next