Re: [PATCH v6] mm/page_owner.c: add llseek for page_owner

[Kassey Li <quic_yingangl@quicinc.com>]

hi, Vlastimil:


On 8/10/2022 5:02 PM, kernel test robot wrote:
> Hi Kassey,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on v5.19]
> [also build test ERROR on next-20220810]
> [cannot apply to akpm-mm/mm-everything linus/master]
> [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/Kassey-Li/mm-page_owner-c-add-llseek-for-page_owner/20220810-093417
> base:    3d7cb6b04c3f3115719235cc6866b10326de34cd
> config: parisc-buildonly-randconfig-r004-20220810 (https://download.01.org/0day-ci/archive/20220810/202208101628.o6qUzx50-lkp@intel.com/config)
> compiler: hppa-linux-gcc (GCC) 12.1.0
> 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/d2decd69a8d5756c1706092c805a4c8af14df471
>          git remote add linux-review https://github.com/intel-lab-lkp/linux
>          git fetch --no-tags linux-review Kassey-Li/mm-page_owner-c-add-llseek-for-page_owner/20220810-093417
>          git checkout d2decd69a8d5756c1706092c805a4c8af14df471
>          # save the config file
>          mkdir build_dir && cp config build_dir/.config
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
>     In file included from mm/page_owner.c:16:
>>> mm/../fs/proc/internal.h:51:9: error: unknown type name 'proc_write_t'
>        51 |         proc_write_t write;
>           |         ^~~~~~~~~~~~

# CONFIG_PROC_FS is not set in some arch, so we can not directly include 
the header file.
+#include "../fs/proc/internal.h"

how about add an extern  ? or do you have other suggest  ?

> 
> 
> vim +/proc_write_t +51 mm/../fs/proc/internal.h
> 
> ^1da177e4c3f41 Linus Torvalds    2005-04-16  19
> 59d8053f1e1690 David Howells     2013-04-11  20  /*
> 59d8053f1e1690 David Howells     2013-04-11  21   * This is not completely implemented yet. The idea is to
> 59d8053f1e1690 David Howells     2013-04-11  22   * create an in-memory tree (like the actual /proc filesystem
> 59d8053f1e1690 David Howells     2013-04-11  23   * tree) of these proc_dir_entries, so that we can dynamically
> 59d8053f1e1690 David Howells     2013-04-11  24   * add new files to /proc.
> 59d8053f1e1690 David Howells     2013-04-11  25   *
> 710585d4922fd3 Nicolas Dichtel   2014-12-10  26   * parent/subdir are used for the directory structure (every /proc file has a
> 710585d4922fd3 Nicolas Dichtel   2014-12-10  27   * parent, but "subdir" is empty for all non-directory entries).
> 710585d4922fd3 Nicolas Dichtel   2014-12-10  28   * subdir_node is used to build the rb tree "subdir" of the parent.
> 59d8053f1e1690 David Howells     2013-04-11  29   */
> 59d8053f1e1690 David Howells     2013-04-11  30  struct proc_dir_entry {
> 163cf548db8887 Alexey Dobriyan   2018-02-06  31  	/*
> 163cf548db8887 Alexey Dobriyan   2018-02-06  32  	 * number of callers into module in progress;
> 163cf548db8887 Alexey Dobriyan   2018-02-06  33  	 * negative -> it's going away RSN
> 163cf548db8887 Alexey Dobriyan   2018-02-06  34  	 */
> 163cf548db8887 Alexey Dobriyan   2018-02-06  35  	atomic_t in_use;
> 9cdd83e3100651 Alexey Dobriyan   2018-04-10  36  	refcount_t refcnt;
> 163cf548db8887 Alexey Dobriyan   2018-02-06  37  	struct list_head pde_openers;	/* who did ->open, but not ->release */
> 53f63345d893df Alexey Dobriyan   2018-02-06  38  	/* protects ->pde_openers and all struct pde_opener instances */
> 53f63345d893df Alexey Dobriyan   2018-02-06  39  	spinlock_t pde_unload_lock;
> 163cf548db8887 Alexey Dobriyan   2018-02-06  40  	struct completion *pde_unload_completion;
> 163cf548db8887 Alexey Dobriyan   2018-02-06  41  	const struct inode_operations *proc_iops;
> d56c0d45f0e27f Alexey Dobriyan   2020-02-03  42  	union {
> d56c0d45f0e27f Alexey Dobriyan   2020-02-03  43  		const struct proc_ops *proc_ops;
> d56c0d45f0e27f Alexey Dobriyan   2020-02-03  44  		const struct file_operations *proc_dir_ops;
> d56c0d45f0e27f Alexey Dobriyan   2020-02-03  45  	};
> 1fde6f21d90f8b Alexey Dobriyan   2019-02-01  46  	const struct dentry_operations *proc_dops;
> 3f3942aca6da35 Christoph Hellwig 2018-05-15  47  	union {
> fddda2b7b52118 Christoph Hellwig 2018-04-13  48  		const struct seq_operations *seq_ops;
> 3f3942aca6da35 Christoph Hellwig 2018-05-15  49  		int (*single_show)(struct seq_file *, void *);
> 3f3942aca6da35 Christoph Hellwig 2018-05-15  50  	};
> 564def71765caf David Howells     2018-05-18 @51  	proc_write_t write;
> 163cf548db8887 Alexey Dobriyan   2018-02-06  52  	void *data;
> 44414d82cfe0f6 Christoph Hellwig 2018-04-24  53  	unsigned int state_size;
> 59d8053f1e1690 David Howells     2013-04-11  54  	unsigned int low_ino;
> 59d8053f1e1690 David Howells     2013-04-11  55  	nlink_t nlink;
> 59d8053f1e1690 David Howells     2013-04-11  56  	kuid_t uid;
> 59d8053f1e1690 David Howells     2013-04-11  57  	kgid_t gid;
> 59d8053f1e1690 David Howells     2013-04-11  58  	loff_t size;
> 710585d4922fd3 Nicolas Dichtel   2014-12-10  59  	struct proc_dir_entry *parent;
> 4f1134370a29a5 Alexey Dobriyan   2018-04-10  60  	struct rb_root subdir;
> 710585d4922fd3 Nicolas Dichtel   2014-12-10  61  	struct rb_node subdir_node;
> b4884f23331ae3 Alexey Dobriyan   2018-04-10  62  	char *name;
> 163cf548db8887 Alexey Dobriyan   2018-02-06  63  	umode_t mode;
> d919b33dafb3e2 Alexey Dobriyan   2020-04-06  64  	u8 flags;
> 59d8053f1e1690 David Howells     2013-04-11  65  	u8 namelen;
> 24074a35c5c975 David Howells     2018-06-13  66  	char inline_name[];
> 3859a271a003ab Kees Cook         2016-10-28  67  } __randomize_layout;
> ^1da177e4c3f41 Linus Torvalds    2005-04-16  68
>