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SubjectRe: [PATCH] Check all .c files for bad kernel-doc comments
Hi Matthew,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.14-rc6 next-20171018]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Matthew-Wilcox/Check-all-c-files-for-bad-kernel-doc-comments/20171030-033926
config: i386-tinyconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All warnings (new ones prefixed by >>):

>> kernel/fork.c:983: warning: No description found for parameter 'mm'
>> kernel/fork.c:983: warning: No description found for parameter 'new_exe_file'
kernel/fork.c:1007: warning: No description found for parameter 'mm'
>> kernel/fork.c:1027: warning: No description found for parameter 'task'
kernel/fork.c:1052: warning: No description found for parameter 'task'
--
>> kernel/cpu.c:53: warning: cannot understand function prototype: 'struct cpuhp_cpu_state '
>> kernel/cpu.c:108: warning: cannot understand function prototype: 'struct cpuhp_step '
>> kernel/cpu.c:1608: warning: No description found for parameter 'name'
--
>> kernel/notifier.c:77: warning: Excess function parameter 'returns' description in 'notifier_call_chain'
--
>> kernel/reboot.c:184: warning: No description found for parameter 'cmd'
--
>> mm/oom_kill.c:175: warning: No description found for parameter 'memcg'
>> mm/oom_kill.c:175: warning: No description found for parameter 'nodemask'
--
>> mm/maccess.c:87: warning: No description found for parameter 'unsafe_addr'
>> mm/maccess.c:87: warning: Excess function parameter 'src' description in 'strncpy_from_unsafe'
--
>> mm/swap.c:932: warning: No description found for parameter 'nr_pages'
>> mm/swap.c:932: warning: Excess function parameter 'nr_entries' description in 'pagevec_lookup_entries'
>> mm/swap.c:982: warning: Excess function parameter 'nr_pages' description in 'pagevec_lookup_range'
--
>> mm/compaction.c:568: warning: No description found for parameter 'cc'
>> mm/compaction.c:1724: warning: No description found for parameter 'prio'
>> mm/compaction.c:1724: warning: Excess function parameter 'mode' description in 'try_to_compact_pages'
--
>> mm/mlock.c:176: warning: No description found for parameter 'page'
--
>> mm/pagewalk.c:286: warning: No description found for parameter 'start'
>> mm/pagewalk.c:286: warning: No description found for parameter 'end'
>> mm/pagewalk.c:286: warning: No description found for parameter 'walk'
--
>> mm/rmap.c:1175: warning: No description found for parameter 'compound'
..

vim +/mm +983 kernel/fork.c

a1b2289c Sherry Yang 2017-10-03 970
90f31d0e Konstantin Khlebnikov 2015-04-16 971 /**
90f31d0e Konstantin Khlebnikov 2015-04-16 972 * set_mm_exe_file - change a reference to the mm's executable file
90f31d0e Konstantin Khlebnikov 2015-04-16 973 *
90f31d0e Konstantin Khlebnikov 2015-04-16 974 * This changes mm's executable file (shown as symlink /proc/[pid]/exe).
90f31d0e Konstantin Khlebnikov 2015-04-16 975 *
6e399cd1 Davidlohr Bueso 2015-04-16 976 * Main users are mmput() and sys_execve(). Callers prevent concurrent
6e399cd1 Davidlohr Bueso 2015-04-16 977 * invocations: in mmput() nobody alive left, in execve task is single
6e399cd1 Davidlohr Bueso 2015-04-16 978 * threaded. sys_prctl(PR_SET_MM_MAP/EXE_FILE) also needs to set the
6e399cd1 Davidlohr Bueso 2015-04-16 979 * mm->exe_file, but does so without using set_mm_exe_file() in order
6e399cd1 Davidlohr Bueso 2015-04-16 980 * to do avoid the need for any locks.
90f31d0e Konstantin Khlebnikov 2015-04-16 981 */
38646013 Jiri Slaby 2011-05-26 982 void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
38646013 Jiri Slaby 2011-05-26 @983 {
6e399cd1 Davidlohr Bueso 2015-04-16 984 struct file *old_exe_file;
6e399cd1 Davidlohr Bueso 2015-04-16 985
6e399cd1 Davidlohr Bueso 2015-04-16 986 /*
6e399cd1 Davidlohr Bueso 2015-04-16 987 * It is safe to dereference the exe_file without RCU as
6e399cd1 Davidlohr Bueso 2015-04-16 988 * this function is only called if nobody else can access
6e399cd1 Davidlohr Bueso 2015-04-16 989 * this mm -- see comment above for justification.
6e399cd1 Davidlohr Bueso 2015-04-16 990 */
6e399cd1 Davidlohr Bueso 2015-04-16 991 old_exe_file = rcu_dereference_raw(mm->exe_file);
90f31d0e Konstantin Khlebnikov 2015-04-16 992
38646013 Jiri Slaby 2011-05-26 993 if (new_exe_file)
38646013 Jiri Slaby 2011-05-26 994 get_file(new_exe_file);
90f31d0e Konstantin Khlebnikov 2015-04-16 995 rcu_assign_pointer(mm->exe_file, new_exe_file);
90f31d0e Konstantin Khlebnikov 2015-04-16 996 if (old_exe_file)
90f31d0e Konstantin Khlebnikov 2015-04-16 997 fput(old_exe_file);
38646013 Jiri Slaby 2011-05-26 998 }
38646013 Jiri Slaby 2011-05-26 999
90f31d0e Konstantin Khlebnikov 2015-04-16 1000 /**
90f31d0e Konstantin Khlebnikov 2015-04-16 1001 * get_mm_exe_file - acquire a reference to the mm's executable file
90f31d0e Konstantin Khlebnikov 2015-04-16 1002 *
90f31d0e Konstantin Khlebnikov 2015-04-16 1003 * Returns %NULL if mm has no associated executable file.
90f31d0e Konstantin Khlebnikov 2015-04-16 1004 * User must release file via fput().
90f31d0e Konstantin Khlebnikov 2015-04-16 1005 */
38646013 Jiri Slaby 2011-05-26 1006 struct file *get_mm_exe_file(struct mm_struct *mm)
38646013 Jiri Slaby 2011-05-26 1007 {
38646013 Jiri Slaby 2011-05-26 1008 struct file *exe_file;
38646013 Jiri Slaby 2011-05-26 1009
90f31d0e Konstantin Khlebnikov 2015-04-16 1010 rcu_read_lock();
90f31d0e Konstantin Khlebnikov 2015-04-16 1011 exe_file = rcu_dereference(mm->exe_file);
90f31d0e Konstantin Khlebnikov 2015-04-16 1012 if (exe_file && !get_file_rcu(exe_file))
90f31d0e Konstantin Khlebnikov 2015-04-16 1013 exe_file = NULL;
90f31d0e Konstantin Khlebnikov 2015-04-16 1014 rcu_read_unlock();
38646013 Jiri Slaby 2011-05-26 1015 return exe_file;
38646013 Jiri Slaby 2011-05-26 1016 }
11163348 Davidlohr Bueso 2015-04-16 1017 EXPORT_SYMBOL(get_mm_exe_file);
38646013 Jiri Slaby 2011-05-26 1018
^1da177e Linus Torvalds 2005-04-16 1019 /**
cd81a917 Mateusz Guzik 2016-08-23 1020 * get_task_exe_file - acquire a reference to the task's executable file
cd81a917 Mateusz Guzik 2016-08-23 1021 *
cd81a917 Mateusz Guzik 2016-08-23 1022 * Returns %NULL if task's mm (if any) has no associated executable file or
cd81a917 Mateusz Guzik 2016-08-23 1023 * this is a kernel thread with borrowed mm (see the comment above get_task_mm).
cd81a917 Mateusz Guzik 2016-08-23 1024 * User must release file via fput().
cd81a917 Mateusz Guzik 2016-08-23 1025 */
cd81a917 Mateusz Guzik 2016-08-23 1026 struct file *get_task_exe_file(struct task_struct *task)
cd81a917 Mateusz Guzik 2016-08-23 @1027 {
cd81a917 Mateusz Guzik 2016-08-23 1028 struct file *exe_file = NULL;
cd81a917 Mateusz Guzik 2016-08-23 1029 struct mm_struct *mm;
cd81a917 Mateusz Guzik 2016-08-23 1030
cd81a917 Mateusz Guzik 2016-08-23 1031 task_lock(task);
cd81a917 Mateusz Guzik 2016-08-23 1032 mm = task->mm;
cd81a917 Mateusz Guzik 2016-08-23 1033 if (mm) {
cd81a917 Mateusz Guzik 2016-08-23 1034 if (!(task->flags & PF_KTHREAD))
cd81a917 Mateusz Guzik 2016-08-23 1035 exe_file = get_mm_exe_file(mm);
cd81a917 Mateusz Guzik 2016-08-23 1036 }
cd81a917 Mateusz Guzik 2016-08-23 1037 task_unlock(task);
cd81a917 Mateusz Guzik 2016-08-23 1038 return exe_file;
cd81a917 Mateusz Guzik 2016-08-23 1039 }
cd81a917 Mateusz Guzik 2016-08-23 1040 EXPORT_SYMBOL(get_task_exe_file);
38646013 Jiri Slaby 2011-05-26 1041

:::::: The code at line 983 was first introduced by commit
:::::: 3864601387cf4196371e3c1897fdffa5228296f9 mm: extract exe_file handling from procfs

:::::: TO: Jiri Slaby <jslaby@suse.cz>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
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https://lists.01.org/pipermail/kbuild-all Intel Corporation
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