linux-kernel - Re: drivers/cpuidle/cpuidle-riscv-sbi.c:79:16: error: variable has incomplete type 'struct sbiret'

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Date:   Tue, 5 Apr 2022 11:26:05 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     kernel test robot <lkp@...el.com>, Anup Patel <anup.patel@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>
Subject: Re: drivers/cpuidle/cpuidle-riscv-sbi.c:79:16: error: variable has
 incomplete type 'struct sbiret'

Hi,

On 4/4/22 23:11, kernel test robot wrote:
> Hi Anup,
> 
> First bad commit (maybe != root cause):
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   3123109284176b1532874591f7c81f3837bbdc17
> commit: c5179ef1ca0c39dab6955be6b0e3c034cc4164c8 RISC-V: Enable RISC-V SBI CPU Idle driver for QEMU virt machine
> date:   4 weeks ago
> config: riscv-randconfig-r022-20220405 (https://download.01.org/0day-ci/archive/20220405/202204051441.dQ4w35Ga-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c4a1b07d0979e7ff20d7d541af666d822d66b566)
> 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 riscv cross compiling tool for clang build
>         # apt-get install binutils-riscv64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c5179ef1ca0c39dab6955be6b0e3c034cc4164c8
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout c5179ef1ca0c39dab6955be6b0e3c034cc4164c8
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 

[delete many build warnings and errors]

>    3 warnings and 17 errors generated.
> 
> Kconfig warnings: (for reference only)
>    WARNING: unmet direct dependencies detected for RISCV_SBI_CPUIDLE
>    Depends on CPU_IDLE && RISCV && RISCV_SBI
>    Selected by
>    - SOC_VIRT && CPU_IDLE

This Kconfig warning is the root of the problem. All of the build errors
and warnings can be fixed by something like so. Is it OK?

---
 arch/riscv/Kconfig.socs |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20220404.orig/arch/riscv/Kconfig.socs
+++ linux-next-20220404/arch/riscv/Kconfig.socs
@@ -38,7 +38,7 @@ config SOC_VIRT
 	select SIFIVE_PLIC
 	select PM_GENERIC_DOMAINS if PM
 	select PM_GENERIC_DOMAINS_OF if PM && OF
-	select RISCV_SBI_CPUIDLE if CPU_IDLE
+	select RISCV_SBI_CPUIDLE if CPU_IDLE && RISCV_SBI
 	help
 	  This enables support for QEMU Virt Machine.
 
[snip]

Also, to the @bot:

Why does the reported Kconfig warning look like it was generated
by some older kconfig software?  Current Kconfig reports more info:

WARNING: unmet direct dependencies detected for RISCV_SBI_CPUIDLE
  Depends on [n]: CPU_IDLE [=y] && RISCV [=y] && RISCV_SBI [=n]
  Selected by [y]:
  - SOC_VIRT [=y] && CPU_IDLE [=y]

Thanks.
> 
> :::::: The code at line 79 was first introduced by commit
> :::::: 6abf32f1d9c5009dcccded2c1e7ca899a4ab587b cpuidle: Add RISC-V SBI CPU idle driver
> 
> :::::: TO: Anup Patel <anup.patel@....com>
> :::::: CC: Palmer Dabbelt <palmer@...osinc.com>
> 

-- 
~Randy