linux-kernel - Re: [PATCH 2/7] fork: Pass struct kernel_clone_args into copy

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Message-ID: <202205070451.wstjDYm7-lkp@intel.com>
Date:   Sat, 7 May 2022 04:38:03 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-arch@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, Tejun Heo <tj@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH 2/7] fork: Pass struct kernel_clone_args into copy_thread

Hi "Eric,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on deller-parisc/for-next]
[also build test ERROR on linus/master v5.18-rc5]
[cannot apply to tip/x86/core next-20220506]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Eric-W-Biederman/kthread-Don-t-allocate-kthread_struct-for-init-and-umh/20220506-221832
base:   https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git for-next
config: h8300-randconfig-r025-20220506 (https://download.01.org/0day-ci/archive/20220507/202205070451.wstjDYm7-lkp@intel.com/config)
compiler: h8300-linux-gcc (GCC) 11.3.0
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
        # https://github.com/intel-lab-lkp/linux/commit/22689080e2beece6919f918620e4c780cf7320eb
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Eric-W-Biederman/kthread-Don-t-allocate-kthread_struct-for-init-and-umh/20220506-221832
        git checkout 22689080e2beece6919f918620e4c780cf7320eb
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=h8300 SHELL=/bin/bash

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 >>):

   arch/h8300/kernel/process.c:58:6: warning: no previous prototype for 'arch_cpu_idle' [-Wmissing-prototypes]
      58 | void arch_cpu_idle(void)
         |      ^~~~~~~~~~~~~
>> arch/h8300/kernel/process.c:108:46: error: unknown type name 'kernel_cloen_args'
     108 | int copy_thread(struct task_struct *p, const kernel_cloen_args *args)
         |                                              ^~~~~~~~~~~~~~~~~
>> arch/h8300/kernel/process.c:108:5: error: conflicting types for 'copy_thread'; have 'int(struct task_struct *, const int *)'
     108 | int copy_thread(struct task_struct *p, const kernel_cloen_args *args)
         |     ^~~~~~~~~~~
   In file included from arch/h8300/kernel/process.c:30:
   include/linux/sched/task.h:71:12: note: previous declaration of 'copy_thread' with type 'int(struct task_struct *, const struct kernel_clone_args *)'
      71 | extern int copy_thread(struct task_struct *, const struct kernel_clone_args *);
         |            ^~~~~~~~~~~
   arch/h8300/kernel/process.c: In function 'copy_thread':
>> arch/h8300/kernel/process.c:110:33: error: request for member 'stack' in something not a structure or union
     110 |         unsigned long usp = args->stack;
         |                                 ^~
   arch/h8300/kernel/process.c:111:36: error: request for member 'stack_size' in something not a structure or union
     111 |         unsigned long topstk = args->stack_size;
         |                                    ^~
   arch/h8300/kernel/process.c: At top level:
   arch/h8300/kernel/process.c:153:16: warning: no previous prototype for 'sys_clone' [-Wmissing-prototypes]
     153 | asmlinkage int sys_clone(unsigned long __user *args)
         |                ^~~~~~~~~


vim +/kernel_cloen_args +108 arch/h8300/kernel/process.c

   107	
 > 108	int copy_thread(struct task_struct *p, const kernel_cloen_args *args)
   109	{
 > 110		unsigned long usp = args->stack;
   111		unsigned long topstk = args->stack_size;
   112		struct pt_regs *childregs;
   113	
   114		childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
   115	
   116		if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
   117			memset(childregs, 0, sizeof(struct pt_regs));
   118			childregs->retpc = (unsigned long) ret_from_kernel_thread;
   119			childregs->er4 = topstk; /* arg */
   120			childregs->er5 = usp; /* fn */
   121		}  else {
   122			*childregs = *current_pt_regs();
   123			childregs->er0 = 0;
   124			childregs->retpc = (unsigned long) ret_from_fork;
   125			p->thread.usp = usp ?: rdusp();
   126		}
   127		p->thread.ksp = (unsigned long)childregs;
   128	
   129		return 0;
   130	}
   131	

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