linux-kernel - Re: [PATCH] USB: hcd: remove unused hcd

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Message-ID: <Yw9ucDxO7huIl/2W@rowland.harvard.edu>
Date:   Wed, 31 Aug 2022 10:21:36 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Rob Herring <robh@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: hcd: remove unused hcd_name variables

On Wed, Aug 31, 2022 at 09:30:32AM +0200, Greg Kroah-Hartman wrote:
> In the commit 10174220f55a ("usb: reduce kernel log spam on driver
> registration") a lot of unneeded kernel log messages were removed, but
> that caused a few build warnings to show up where the variable
> `hcd_name` was being set but never used anymore.
> 
> Resolve this by just removing these variables as they are not needed
> anymore
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Cc: Ard Biesheuvel <ardb@...nel.org>
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Cc: Alim Akhtar <alim.akhtar@...sung.com>
> Cc: Rob Herring <robh@...nel.org>
> Cc: linux-usb@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-samsung-soc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Fixes: 10174220f55a ("usb: reduce kernel log spam on driver registration")
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/usb/host/ehci-exynos.c   | 1 -
>  drivers/usb/host/ehci-platform.c | 2 --
>  drivers/usb/host/ohci-platform.c | 2 --
>  3 files changed, 5 deletions(-)

This isn't enough, as you can see from this kernel test robot excerpt:

clang_recent_errors
|-- arm-s5pv210_defconfig
|   |-- drivers-usb-host-ehci-exynos.c:warning:unused-variable-hcd_name
|   `-- drivers-usb-host-ohci-exynos.c:warning:unused-variable-hcd_name
|-- hexagon-randconfig-r024-20220830
|   |-- drivers-usb-host-ehci-atmel.c:warning:unused-variable-hcd_name
|   |-- drivers-usb-host-ehci-exynos.c:warning:unused-variable-hcd_name
|   |-- drivers-usb-host-ehci-orion.c:warning:unused-variable-hcd_name
|   |-- 
drivers-usb-host-ehci-platform.c:warning:unused-variable-hcd_name
|   |-- drivers-usb-host-ehci-spear.c:warning:unused-variable-hcd_name
|   `-- 
drivers-usb-host-ohci-platform.c:warning:unused-variable-hcd_name
|-- hexagon-randconfig-r036-20220830
|   |-- drivers-usb-host-ehci-atmel.c:warning:unused-variable-hcd_name
|   |-- drivers-usb-host-ehci-npcm7xx.c:warning:unused-variable-hcd_name
|   |-- 
drivers-usb-host-ehci-platform.c:warning:unused-variable-hcd_name
|   |-- drivers-usb-host-ehci-st.c:warning:unused-variable-hcd_name
|   |-- drivers-usb-host-ohci-at91.c:warning:unused-variable-hcd_name
|   |-- 
drivers-usb-host-ohci-platform.c:warning:unused-variable-hcd_name
|   |-- drivers-usb-host-ohci-s3c2410.c:warning:unused-variable-hcd_name
|   |-- drivers-usb-host-ohci-spear.c:warning:unused-variable-hcd_name
|   `-- drivers-usb-host-ohci-st.c:warning:unused-variable-hcd_name

Yes, it has duplicates and your patch handles some of these.  But there 
are others that still need to be fixed.  Also, this list is missing 
ohci-pxa27x.c.

Alan Stern