linux-kernel - Re: [patch v3 2/3] drivers: jtag: Add Aspeed SoC 24xx and 25xx families JTAG master driver

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Message-ID: <CAK8P3a3H5QUBn9LDqqrwuES6UUH438B4asWXQ-PDhgb-oaWFHA@mail.gmail.com>
Date:   Sat, 19 Aug 2017 14:27:37 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     kbuild test robot <lkp@...el.com>
Cc:     Oleksandr Shamray <oleksandrs@...lanox.com>, kbuild-all@...org,
        gregkh <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        devicetree@...r.kernel.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Joel Stanley <joel@....id.au>,
        Jiří Pírko <jiri@...nulli.us>,
        Tobias Klauser <tklauser@...tanz.ch>,
        linux-serial@...r.kernel.org, mec@...ut.net, vadimp@...llanox.com,
        system-sw-low-level@...lanox.com, Rob Herring <robh+dt@...nel.org>,
        openocd-devel-owner@...ts.sourceforge.net,
        Jiri Pirko <jiri@...lanox.com>,
        Richard Weinberger <richard@....at>,
        uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: Re: [patch v3 2/3] drivers: jtag: Add Aspeed SoC 24xx and 25xx
 families JTAG master driver

On Sat, Aug 19, 2017 at 3:21 AM, kbuild test robot <lkp@...el.com> wrote:
> Hi Oleksandr,
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v4.13-rc5 next-20170817]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/Oleksandr-Shamray/drivers-jtag-Add-JTAG-core-driver/20170818-114739
> config: um-allyesconfig (attached as .config)
> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=um
>
> All errors (new ones prefixed by >>):
>
>    drivers/auxdisplay/img-ascii-lcd.o: In function `img_ascii_lcd_probe':
>    drivers/auxdisplay/img-ascii-lcd.c:386: undefined reference to `devm_ioremap_resource'
>    drivers/jtag/jtag-aspeed.o: In function `aspeed_jtag_init':
>>> drivers/jtag/jtag-aspeed.c:635: undefined reference to `devm_ioremap_resource'
>    collect2: error: ld returned 1 exit status

So arch/um now provides an ioremap() stub despite the absence of
CONFIG_HAS_IOMEM, but the respective devm_* interface from
lib/devres.c is not available.

We can either work around this for new drivers as we used to do for
ioremap() by adding a correct 'depends on HAS_IOMEM' Kconfig
dependency, or we could find a way for arch/um to provide stubs
for the additional functions as well.

      Arnd