linux-kernel - Re: linux-next: build warnings after merge of the pwm tree

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Message-ID: <5748e9f5-b560-467b-a50d-5590b9acbaf1@samsung.com>
Date: Tue, 28 Oct 2025 10:52:20 +0100
From: Michal Wilczynski <m.wilczynski@...sung.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>,
	Uwe Kleine-König <ukleinek@...nel.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux Next
	Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warnings after merge of the pwm tree



On 10/28/25 03:39, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the pwm tree, today's linux-next build (x86_64 allmodconfig)
> produced these warnings:
> 
> WARNING: modpost: module pwm_th1520 uses symbol pwmchip_release from namespace PWM, but does not import it.
> WARNING: modpost: module pwm_th1520 uses symbol __pwmchip_add from namespace PWM, but does not import it.
> WARNING: modpost: module pwm_th1520 uses symbol pwmchip_alloc from namespace PWM, but does not import it.
> WARNING: modpost: module pwm_th1520 uses symbol pwmchip_remove from namespace PWM, but does not import it.

Hi, Thank you for the report. Interestingly this seems to be the first
Rust driver that needs to write 'import_ns' in the .modpost section. For
C drivers the macro MODULE_IMPORT_NS("PWM") was simply included with
pwm.h. I think the module! macro needs to be extended to support
import_ns in rust/macros/module.rs. I think I know how to do it code
wise, will post a patch.

> 
> Presumably introduced by commit
> 
>   fb3957af9ec6 ("pwm: Add Rust driver for T-HEAD TH1520 SoC")
> 

Best regards,
-- 
Michal Wilczynski <m.wilczynski@...sung.com>