linux-kernel - Re: linux-next: build failure after merge of the pci tree

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Date:   Tue, 24 Oct 2023 14:01:26 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Bjorn Helgaas <bhelgaas@...gle.com>
cc:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the pci tree

On Tue, 24 Oct 2023, Stephen Rothwell wrote:

> Hi all,
> 
> After merging the pci tree, today's linux-next build (arm64 defconfig)
> failed like this:
> 
> In file included from <command-line>:
> drivers/pci/controller/dwc/pcie-tegra194.c: In function 'tegra_pcie_ep_irq_thread':
> include/linux/compiler_types.h:435:45: error: call to '__compiletime_assert_497' declared with attribute error: FIELD_PREP: value too large for the field
>   435 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>       |                                             ^
> include/linux/compiler_types.h:416:25: note: in definition of macro '__compiletime_assert'
>   416 |                         prefix ## suffix();                             \
>       |                         ^~~~~~
> include/linux/compiler_types.h:435:9: note: in expansion of macro '_compiletime_assert'
>   435 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>       |         ^~~~~~~~~~~~~~~~~~~
> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>    39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>       |                                     ^~~~~~~~~~~~~~~~~~
> include/linux/bitfield.h:68:17: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>    68 |                 BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ?           \
>       |                 ^~~~~~~~~~~~~~~~
> include/linux/bitfield.h:114:17: note: in expansion of macro '__BF_FIELD_CHECK'
>   114 |                 __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: ");    \
>       |                 ^~~~~~~~~~~~~~~~
> drivers/pci/controller/dwc/pcie-tegra194.c:498:29: note: in expansion of macro 'FIELD_PREP'
>   498 |                 val = 110 | FIELD_PREP(PCI_LTR_SCALE_SHIFT, 2) | LTR_MSG_REQ;
>       |                             ^~~~~~~~~~
> 
> Caused by commit
> 
>   18ca6c2c2d0e ("PCI: dwc: Use FIELD_GET/PREP()")
> 
> I have reverted that commit for today.

Thanks for providing the full error message. I already was trying to
investigate it and reproduce the problem because LKP's report I got about 
this failed to provide the full error message.

It seems that the original code was more complex than it looked and the 
patch is wrong and suboptimal on multiple counts. I'll provide a fixed 
v2.

-- 
 i.