Re: [PATCH 1/5] kernel: Move kernel_clone_args's fn to new struct

From: kernel test robot
Date: Sun Feb 12 2023 - 22:31:10 EST

Hi Mike,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on vfs-idmapping/for-next linus/master v6.2-rc8]
[cannot apply to davem-sparc/master next-20230210]
[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#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Mike-Christie/kernel-Move-kernel_clone_args-s-fn-to-new-struct/20230213-090304
patch link: https://lore.kernel.org/r/20230213010020.1813-2-michael.christie%40oracle.com
patch subject: [PATCH 1/5] kernel: Move kernel_clone_args's fn to new struct
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20230213/202302131159.c56w5Bln-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
# https://github.com/intel-lab-lkp/linux/commit/3eb77c0672cdc93fa577d5feb91b79f272d883b7
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Mike-Christie/kernel-Move-kernel_clone_args-s-fn-to-new-struct/20230213-090304
git checkout 3eb77c0672cdc93fa577d5feb91b79f272d883b7
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 O=build_dir ARCH=um SUBARCH=i386 olddefconfig
make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202302131159.c56w5Bln-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

arch/um/kernel/process.c:51:5: warning: no previous prototype for 'pid_to_processor_id' [-Wmissing-prototypes]
51 | int pid_to_processor_id(int pid)
| ^~~~~~~~~~~~~~~~~~~
arch/um/kernel/process.c:87:7: warning: no previous prototype for '__switch_to' [-Wmissing-prototypes]
87 | void *__switch_to(struct task_struct *from, struct task_struct *to)
| ^~~~~~~~~~~
arch/um/kernel/process.c: In function 'new_thread_handler':
arch/um/kernel/process.c:122:28: warning: variable 'n' set but not used [-Wunused-but-set-variable]
122 | int (*fn)(void *), n;
| ^
arch/um/kernel/process.c: At top level:
arch/um/kernel/process.c:140:6: warning: no previous prototype for 'fork_handler' [-Wmissing-prototypes]
140 | void fork_handler(void)
| ^~~~~~~~~~~~
arch/um/kernel/process.c: In function 'copy_thread':
>> arch/um/kernel/process.c:187:20: error: 'const struct kernel_clone_args' has no member named 'fn'; did you mean 'fns'?
187 | if (!args->fn) {
| ^~
| fns
arch/um/kernel/process.c: At top level:
arch/um/kernel/process.c:217:6: warning: no previous prototype for 'arch_cpu_idle' [-Wmissing-prototypes]
217 | void arch_cpu_idle(void)
| ^~~~~~~~~~~~~
arch/um/kernel/process.c:253:5: warning: no previous prototype for 'copy_to_user_proc' [-Wmissing-prototypes]
253 | int copy_to_user_proc(void __user *to, void *from, int size)
| ^~~~~~~~~~~~~~~~~
arch/um/kernel/process.c:263:5: warning: no previous prototype for 'clear_user_proc' [-Wmissing-prototypes]
263 | int clear_user_proc(void __user *buf, int size)
| ^~~~~~~~~~~~~~~
arch/um/kernel/process.c:316:12: warning: no previous prototype for 'make_proc_sysemu' [-Wmissing-prototypes]
316 | int __init make_proc_sysemu(void)
| ^~~~~~~~~~~~~~~~
arch/um/kernel/process.c:356:15: warning: no previous prototype for 'arch_align_stack' [-Wmissing-prototypes]
356 | unsigned long arch_align_stack(unsigned long sp)
| ^~~~~~~~~~~~~~~~


vim +187 arch/um/kernel/process.c

77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 157
c5febea0956fd3 arch/um/kernel/process.c Eric W. Biederman 2022-04-08 158 int copy_thread(struct task_struct * p, const struct kernel_clone_args *args)
^1da177e4c3f41 arch/um/kernel/process_kern.c Linus Torvalds 2005-04-16 159 {
c5febea0956fd3 arch/um/kernel/process.c Eric W. Biederman 2022-04-08 160 unsigned long clone_flags = args->flags;
c5febea0956fd3 arch/um/kernel/process.c Eric W. Biederman 2022-04-08 161 unsigned long sp = args->stack;
c5febea0956fd3 arch/um/kernel/process.c Eric W. Biederman 2022-04-08 162 unsigned long tls = args->tls;
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 163 void (*handler)(void);
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 164 int ret = 0;
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 165
^1da177e4c3f41 arch/um/kernel/process_kern.c Linus Torvalds 2005-04-16 166 p->thread = (struct thread_struct) INIT_THREAD;
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 167
3eb77c0672cdc9 arch/um/kernel/process.c Mike Christie 2023-02-12 168 if (!args->fns || !args->fns->thread_fn) {
2b067fc9dd143b arch/um/kernel/process.c Al Viro 2012-10-29 169 memcpy(&p->thread.regs.regs, current_pt_regs(),
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 170 sizeof(p->thread.regs.regs));
a3170d2ec25f84 arch/um/kernel/process.c Al Viro 2012-05-22 171 PT_REGS_SET_SYSCALL_RETURN(&p->thread.regs, 0);
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 172 if (sp != 0)
18badddaa84e13 arch/um/kernel/process.c Jeff Dike 2007-10-16 173 REGS_SP(p->thread.regs.regs.gp) = sp;
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 174
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 175 handler = fork_handler;
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 176
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 177 arch_copy_thread(&current->thread.arch, &p->thread.arch);
d2ce4e92fa4f79 arch/um/kernel/process.c Al Viro 2012-09-20 178 } else {
fbfe9c847edf57 arch/um/kernel/process.c Ingo van Lil 2011-09-14 179 get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp);
3eb77c0672cdc9 arch/um/kernel/process.c Mike Christie 2023-02-12 180 p->thread.request.u.thread.proc = args->fns->thread_fn;
5bd2e97c868a8a arch/um/kernel/process.c Eric W. Biederman 2022-04-12 181 p->thread.request.u.thread.arg = args->fn_arg;
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 182 handler = new_thread_handler;
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 183 }
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 184
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 185 new_thread(task_stack_page(p), &p->thread.switch_buf, handler);
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 186
5bd2e97c868a8a arch/um/kernel/process.c Eric W. Biederman 2022-04-12 @187 if (!args->fn) {
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 188 clear_flushed_tls(p);
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 189
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 190 /*
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 191 * Set a new TLS for the child thread?
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 192 */
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 193 if (clone_flags & CLONE_SETTLS)
457677c70c7672 arch/um/kernel/process.c Amanieu d'Antras 2020-01-04 194 ret = arch_set_tls(p, tls);
77bf4400319db9 arch/um/kernel/process.c Jeff Dike 2007-10-16 195 }
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 196
aa6758d4867cd0 arch/um/kernel/process_kern.c Paolo 'Blaisorblade' Giarrusso 2006-03-31 197 return ret;
^1da177e4c3f41 arch/um/kernel/process_kern.c Linus Torvalds 2005-04-16 198 }
^1da177e4c3f41 arch/um/kernel/process_kern.c Linus Torvalds 2005-04-16 199

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