Re: drivers/gpio/gpio-dwapb.c:678:12: warning: stack frame size of 2064 bytes in function 'dwapb_gpio_probe'

From: Nick Desaulniers
Date: Mon May 03 2021 - 16:49:47 EST

On Mon, May 3, 2021 at 1:40 AM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
>
> On Mon, May 3, 2021 at 1:54 AM kernel test robot <lkp@xxxxxxxxx> wrote:
> >
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: 27787ba3fa4904422b3928b898d1bd3d74d98bea
> > commit: 60593df667e087b009ee0fc20d92e9c4c096a9b5 gpio: dwapb: fix NULL pointer dereference at dwapb_gpio_suspend()
> > date: 5 months ago
> > config: powerpc64-randconfig-r026-20210430 (attached as .config)
> > compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8f5a2a5836cc8e4c1def2bdeb022e7b496623439)
> > reproduce (this is a W=1 build):
> > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> > chmod +x ~/bin/make.cross
> > # install powerpc64 cross compiling tool for clang build
> > # apt-get install binutils-powerpc64-linux-gnu
> > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=60593df667e087b009ee0fc20d92e9c4c096a9b5
> > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > git fetch --no-tags linus master
> > git checkout 60593df667e087b009ee0fc20d92e9c4c096a9b5
> > # save the attached .config to linux build tree
> > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=powerpc64
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> drivers/gpio/gpio-dwapb.c:678:12: warning: stack frame size of 2064 bytes in function 'dwapb_gpio_probe' [-Wframe-larger-than=]
> > static int dwapb_gpio_probe(struct platform_device *pdev)
> > ^
> > 1 warning generated.
>
> Another Clang bug?

We have a KI with ASAN's requirements on additional stack usage for
shadow stacks not being considered when making decisions whether or
not to inline. Looks like KASAN isn't enabled by this randconfig;
UBSAN is. I don't know if UBSAN has similar additional stack usage to
KASAN.

I can reproduce this warning on mainline with:
$ wget https://groups.google.com/group/clang-built-linux/attach/983d2ad77c1d/.config.gz\?part\=0.1
-O - | gunzip > .config
$ ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- make CC=clang -j72
drivers/gpio/gpio-dwapb.o

If I enable CONFIG_DEBUG_INFO, then rebuild, I have a utility for
helping track these down from parsing the DWARF debug info.
Unfortunately, it depends on pyelftools which doesn't know any ppc64
relocations; let me see if I can implement that real quick, which
should help debug this futher.

>
> > vim +/dwapb_gpio_probe +678 drivers/gpio/gpio-dwapb.c
> >
> > a72b8c4a63e2a3 Hoan Tran 2017-02-21 677
> > 7779b34556978f Jamie Iles 2014-02-25 @678 static int dwapb_gpio_probe(struct platform_device *pdev)
> > 7779b34556978f Jamie Iles 2014-02-25 679 {
> > 3d2613c4289ff2 Weike Chen 2014-09-17 680 unsigned int i;
> > 7779b34556978f Jamie Iles 2014-02-25 681 struct dwapb_gpio *gpio;
> > 7779b34556978f Jamie Iles 2014-02-25 682 int err;
> > 3d2613c4289ff2 Weike Chen 2014-09-17 683 struct device *dev = &pdev->dev;
> > 3d2613c4289ff2 Weike Chen 2014-09-17 684 struct dwapb_platform_data *pdata = dev_get_platdata(dev);
> > 3d2613c4289ff2 Weike Chen 2014-09-17 685
> > da9df93e9e0fd1 Axel Lin 2014-12-28 686 if (!pdata) {
> > 4ba8cfa79f44a9 Jiang Qiu 2016-04-28 687 pdata = dwapb_gpio_get_pdata(dev);
> > 3d2613c4289ff2 Weike Chen 2014-09-17 688 if (IS_ERR(pdata))
> > 3d2613c4289ff2 Weike Chen 2014-09-17 689 return PTR_ERR(pdata);
> > 3d2613c4289ff2 Weike Chen 2014-09-17 690 }
> > 7779b34556978f Jamie Iles 2014-02-25 691
> > da9df93e9e0fd1 Axel Lin 2014-12-28 692 if (!pdata->nports)
> > da9df93e9e0fd1 Axel Lin 2014-12-28 693 return -ENODEV;
> > 7779b34556978f Jamie Iles 2014-02-25 694
> > 3d2613c4289ff2 Weike Chen 2014-09-17 695 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
> > da9df93e9e0fd1 Axel Lin 2014-12-28 696 if (!gpio)
> > da9df93e9e0fd1 Axel Lin 2014-12-28 697 return -ENOMEM;
> > da9df93e9e0fd1 Axel Lin 2014-12-28 698
> > 3d2613c4289ff2 Weike Chen 2014-09-17 699 gpio->dev = &pdev->dev;
> > 3d2613c4289ff2 Weike Chen 2014-09-17 700 gpio->nr_ports = pdata->nports;
> > 3d2613c4289ff2 Weike Chen 2014-09-17 701
> > 4731d80f5ea9b8 Serge Semin 2020-07-30 702 err = dwapb_get_reset(gpio);
> > 4731d80f5ea9b8 Serge Semin 2020-07-30 703 if (err)
> > 4731d80f5ea9b8 Serge Semin 2020-07-30 704 return err;
> > 07901a94f9f9b1 Alan Tull 2017-10-11 705
> > 3d2613c4289ff2 Weike Chen 2014-09-17 706 gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports,
> > 7779b34556978f Jamie Iles 2014-02-25 707 sizeof(*gpio->ports), GFP_KERNEL);
> > da9df93e9e0fd1 Axel Lin 2014-12-28 708 if (!gpio->ports)
> > da9df93e9e0fd1 Axel Lin 2014-12-28 709 return -ENOMEM;
> > 7779b34556978f Jamie Iles 2014-02-25 710
> > 2a7194e9759586 Enrico Weigelt, metux IT consult 2019-03-11 711 gpio->regs = devm_platform_ioremap_resource(pdev, 0);
> > da9df93e9e0fd1 Axel Lin 2014-12-28 712 if (IS_ERR(gpio->regs))
> > da9df93e9e0fd1 Axel Lin 2014-12-28 713 return PTR_ERR(gpio->regs);
> > 7779b34556978f Jamie Iles 2014-02-25 714
> > daa3f58d180c07 Serge Semin 2020-07-30 715 err = dwapb_get_clks(gpio);
> > daa3f58d180c07 Serge Semin 2020-07-30 716 if (err)
> > e6bf37736f6495 Phil Edworthy 2018-03-12 717 return err;
> > e6bf37736f6495 Phil Edworthy 2018-03-12 718
> > 9826bbe1fef0b5 Andy Shevchenko 2020-04-15 719 gpio->flags = (uintptr_t)device_get_match_data(dev);
> > a72b8c4a63e2a3 Hoan Tran 2017-02-21 720
> > 3d2613c4289ff2 Weike Chen 2014-09-17 721 for (i = 0; i < gpio->nr_ports; i++) {
> > 3d2613c4289ff2 Weike Chen 2014-09-17 722 err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i);
> > 7779b34556978f Jamie Iles 2014-02-25 723 if (err)
> > 7779b34556978f Jamie Iles 2014-02-25 724 return err;
> > 7779b34556978f Jamie Iles 2014-02-25 725 }
> > 7779b34556978f Jamie Iles 2014-02-25 726
> > 60593df667e087 Luo Jiaxing 2020-11-27 727 platform_set_drvdata(pdev, gpio);
> > 60593df667e087 Luo Jiaxing 2020-11-27 728
> > 7779b34556978f Jamie Iles 2014-02-25 729 return 0;
> > 7779b34556978f Jamie Iles 2014-02-25 730 }
> > 7779b34556978f Jamie Iles 2014-02-25 731
> >
> > :::::: The code at line 678 was first introduced by commit
> > :::::: 7779b34556978f6771a78bd87557523623e0405b gpio: add a driver for the Synopsys DesignWare APB GPIO block
> >
> > :::::: TO: Jamie Iles <jamie@xxxxxxxxxxxxx>
> > :::::: CC: Linus Walleij <linus.walleij@xxxxxxxxxx>
> >
> > ---
> > 0-DAY CI Kernel Test Service, Intel Corporation
> > https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
>
>
>
> --
> With Best Regards,
> Andy Shevchenko
>
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--
Thanks,
~Nick Desaulniers