Re: [PATCH] perf/core: introduced stub APIs for exported APIs

From: kernel test robot
Date: Sun Mar 05 2023 - 02:37:36 EST

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Hi Manish,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on acme/perf/core tip/master tip/auto-latest linus/master v6.2 next-20230303]
[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/Manish-Bhardwaj/perf-core-introduced-stub-APIs-for-exported-APIs/20230305-134024
patch link: https://lore.kernel.org/r/20230305053934.9948-1-bhardwajmanish18%40gmail.com
patch subject: [PATCH] perf/core: introduced stub APIs for exported APIs
config: powerpc-allnoconfig (https://download.01.org/0day-ci/archive/20230305/202303051529.2PHyXSBM-lkp@xxxxxxxxx/config)
compiler: powerpc-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/2636181e6d3f39c8485077cb15927f84f00a617c
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Manish-Bhardwaj/perf-core-introduced-stub-APIs-for-exported-APIs/20230305-134024
git checkout 2636181e6d3f39c8485077cb15927f84f00a617c
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/kernel/ fs/

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/202303051529.2PHyXSBM-lkp@xxxxxxxxx/

All error/warnings (new ones prefixed by >>):

In file included from include/linux/trace_events.h:10,
from include/trace/syscall.h:7,
from include/linux/syscalls.h:88,
from fs/open.c:27:
>> include/linux/perf_event.h:1702:13: warning: no previous prototype for 'perf_pmu_unregister' [-Wmissing-prototypes]
1702 | extern void perf_pmu_unregister(struct pmu *pmu) { }
| ^~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1713:16: warning: 'perf_event_sysfs_show' defined but not used [-Wunused-function]
1713 | static ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
| ^~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1712:13: warning: 'perf_pmu_migrate_context' defined but not used [-Wunused-function]
1712 | static void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1704:1: warning: 'perf_event_create_kernel_counter' defined but not used [-Wunused-function]
1704 | perf_event_create_kernel_counter(struct perf_event_attr *attr,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1698:12: warning: 'perf_pmu_register' defined but not used [-Wunused-function]
1698 | static int perf_pmu_register(struct pmu *pmu, const char *name, int type)
| ^~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1692:13: warning: 'perf_tp_event' defined but not used [-Wunused-function]
1692 | static void perf_tp_event(u16 event_type, u64 count, void *record,
| ^~~~~~~~~~~~~
include/linux/perf_event.h:1691:13: warning: 'perf_report_aux_output_id' defined but not used [-Wunused-function]
1691 | static void perf_report_aux_output_id(struct perf_event *event, u64 hw_id) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1690:13: warning: 'perf_unregister_guest_info_callbacks' defined but not used [-Wunused-function]
1690 | static void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1689:13: warning: 'perf_register_guest_info_callbacks' defined but not used [-Wunused-function]
1689 | static void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1688:13: warning: 'perf_event_update_userpage' defined but not used [-Wunused-function]
1688 | static void perf_event_update_userpage(struct perf_event *event) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1683:12: warning: 'perf_event_read_value' defined but not used [-Wunused-function]
1683 | static u64 perf_event_read_value(struct perf_event *event,
| ^~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1682:13: warning: 'perf_event_addr_filters_sync' defined but not used [-Wunused-function]
1682 | static void perf_event_addr_filters_sync(struct perf_event *event) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/trace_events.h:10,
from include/trace/syscall.h:7,
from include/linux/syscalls.h:88,
from fs/pipe.c:24:
>> include/linux/perf_event.h:1702:13: warning: no previous prototype for 'perf_pmu_unregister' [-Wmissing-prototypes]
1702 | extern void perf_pmu_unregister(struct pmu *pmu) { }
| ^~~~~~~~~~~~~~~~~~~
fs/pipe.c:757:15: warning: no previous prototype for 'account_pipe_buffers' [-Wmissing-prototypes]
757 | unsigned long account_pipe_buffers(struct user_struct *user,
| ^~~~~~~~~~~~~~~~~~~~
fs/pipe.c:763:6: warning: no previous prototype for 'too_many_pipe_buffers_soft' [-Wmissing-prototypes]
763 | bool too_many_pipe_buffers_soft(unsigned long user_bufs)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
fs/pipe.c:770:6: warning: no previous prototype for 'too_many_pipe_buffers_hard' [-Wmissing-prototypes]
770 | bool too_many_pipe_buffers_hard(unsigned long user_bufs)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
fs/pipe.c:777:6: warning: no previous prototype for 'pipe_is_unprivileged_user' [-Wmissing-prototypes]
777 | bool pipe_is_unprivileged_user(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
fs/pipe.c:1253:5: warning: no previous prototype for 'pipe_resize_ring' [-Wmissing-prototypes]
1253 | int pipe_resize_ring(struct pipe_inode_info *pipe, unsigned int nr_slots)
| ^~~~~~~~~~~~~~~~
include/linux/perf_event.h:1713:16: warning: 'perf_event_sysfs_show' defined but not used [-Wunused-function]
1713 | static ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
| ^~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1712:13: warning: 'perf_pmu_migrate_context' defined but not used [-Wunused-function]
1712 | static void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1704:1: warning: 'perf_event_create_kernel_counter' defined but not used [-Wunused-function]
1704 | perf_event_create_kernel_counter(struct perf_event_attr *attr,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1698:12: warning: 'perf_pmu_register' defined but not used [-Wunused-function]
1698 | static int perf_pmu_register(struct pmu *pmu, const char *name, int type)
| ^~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1692:13: warning: 'perf_tp_event' defined but not used [-Wunused-function]
1692 | static void perf_tp_event(u16 event_type, u64 count, void *record,
| ^~~~~~~~~~~~~
include/linux/perf_event.h:1691:13: warning: 'perf_report_aux_output_id' defined but not used [-Wunused-function]
1691 | static void perf_report_aux_output_id(struct perf_event *event, u64 hw_id) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1690:13: warning: 'perf_unregister_guest_info_callbacks' defined but not used [-Wunused-function]
1690 | static void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1689:13: warning: 'perf_register_guest_info_callbacks' defined but not used [-Wunused-function]
1689 | static void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1688:13: warning: 'perf_event_update_userpage' defined but not used [-Wunused-function]
1688 | static void perf_event_update_userpage(struct perf_event *event) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1683:12: warning: 'perf_event_read_value' defined but not used [-Wunused-function]
1683 | static u64 perf_event_read_value(struct perf_event *event,
| ^~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1682:13: warning: 'perf_event_addr_filters_sync' defined but not used [-Wunused-function]
1682 | static void perf_event_addr_filters_sync(struct perf_event *event) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/trace_events.h:10,
from include/trace/syscall.h:7,
from include/linux/syscalls.h:88,
from fs/d_path.c:2:
>> include/linux/perf_event.h:1702:13: warning: no previous prototype for 'perf_pmu_unregister' [-Wmissing-prototypes]
1702 | extern void perf_pmu_unregister(struct pmu *pmu) { }
| ^~~~~~~~~~~~~~~~~~~
fs/d_path.c:317:7: warning: no previous prototype for 'simple_dname' [-Wmissing-prototypes]
317 | char *simple_dname(struct dentry *dentry, char *buffer, int buflen)
| ^~~~~~~~~~~~
include/linux/perf_event.h:1713:16: warning: 'perf_event_sysfs_show' defined but not used [-Wunused-function]
1713 | static ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
| ^~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1712:13: warning: 'perf_pmu_migrate_context' defined but not used [-Wunused-function]
1712 | static void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1704:1: warning: 'perf_event_create_kernel_counter' defined but not used [-Wunused-function]
1704 | perf_event_create_kernel_counter(struct perf_event_attr *attr,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1698:12: warning: 'perf_pmu_register' defined but not used [-Wunused-function]
1698 | static int perf_pmu_register(struct pmu *pmu, const char *name, int type)
| ^~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1692:13: warning: 'perf_tp_event' defined but not used [-Wunused-function]
1692 | static void perf_tp_event(u16 event_type, u64 count, void *record,
| ^~~~~~~~~~~~~
include/linux/perf_event.h:1691:13: warning: 'perf_report_aux_output_id' defined but not used [-Wunused-function]
1691 | static void perf_report_aux_output_id(struct perf_event *event, u64 hw_id) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1690:13: warning: 'perf_unregister_guest_info_callbacks' defined but not used [-Wunused-function]
1690 | static void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1689:13: warning: 'perf_register_guest_info_callbacks' defined but not used [-Wunused-function]
1689 | static void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1688:13: warning: 'perf_event_update_userpage' defined but not used [-Wunused-function]
1688 | static void perf_event_update_userpage(struct perf_event *event) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1683:12: warning: 'perf_event_read_value' defined but not used [-Wunused-function]
1683 | static u64 perf_event_read_value(struct perf_event *event,
| ^~~~~~~~~~~~~~~~~~~~~
include/linux/perf_event.h:1682:13: warning: 'perf_event_addr_filters_sync' defined but not used [-Wunused-function]
1682 | static void perf_event_addr_filters_sync(struct perf_event *event) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/trace_events.h:10,
from include/trace/syscall.h:7,
from include/linux/syscalls.h:88,
from arch/powerpc/kernel/syscalls.c:19:
>> include/linux/perf_event.h:1702:13: error: no previous prototype for 'perf_pmu_unregister' [-Werror=missing-prototypes]
1702 | extern void perf_pmu_unregister(struct pmu *pmu) { }
| ^~~~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1713:16: error: 'perf_event_sysfs_show' defined but not used [-Werror=unused-function]
1713 | static ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
| ^~~~~~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1712:13: error: 'perf_pmu_migrate_context' defined but not used [-Werror=unused-function]
1712 | static void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1704:1: error: 'perf_event_create_kernel_counter' defined but not used [-Werror=unused-function]
1704 | perf_event_create_kernel_counter(struct perf_event_attr *attr,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1698:12: error: 'perf_pmu_register' defined but not used [-Werror=unused-function]
1698 | static int perf_pmu_register(struct pmu *pmu, const char *name, int type)
| ^~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1692:13: error: 'perf_tp_event' defined but not used [-Werror=unused-function]
1692 | static void perf_tp_event(u16 event_type, u64 count, void *record,
| ^~~~~~~~~~~~~
>> include/linux/perf_event.h:1691:13: error: 'perf_report_aux_output_id' defined but not used [-Werror=unused-function]
1691 | static void perf_report_aux_output_id(struct perf_event *event, u64 hw_id) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1690:13: error: 'perf_unregister_guest_info_callbacks' defined but not used [-Werror=unused-function]
1690 | static void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1689:13: error: 'perf_register_guest_info_callbacks' defined but not used [-Werror=unused-function]
1689 | static void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1688:13: error: 'perf_event_update_userpage' defined but not used [-Werror=unused-function]
1688 | static void perf_event_update_userpage(struct perf_event *event) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1683:12: error: 'perf_event_read_value' defined but not used [-Werror=unused-function]
1683 | static u64 perf_event_read_value(struct perf_event *event,
| ^~~~~~~~~~~~~~~~~~~~~
>> include/linux/perf_event.h:1682:13: error: 'perf_event_addr_filters_sync' defined but not used [-Werror=unused-function]
1682 | static void perf_event_addr_filters_sync(struct perf_event *event) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

vim +/perf_pmu_unregister +1702 include/linux/perf_event.h

1649
1650 extern int perf_output_begin(struct perf_output_handle *handle,
1651 struct perf_sample_data *data,
1652 struct perf_event *event, unsigned int size);
1653 extern int perf_output_begin_forward(struct perf_output_handle *handle,
1654 struct perf_sample_data *data,
1655 struct perf_event *event,
1656 unsigned int size);
1657 extern int perf_output_begin_backward(struct perf_output_handle *handle,
1658 struct perf_sample_data *data,
1659 struct perf_event *event,
1660 unsigned int size);
1661
1662 extern void perf_output_end(struct perf_output_handle *handle);
1663 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
1664 const void *buf, unsigned int len);
1665 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
1666 unsigned int len);
1667 extern long perf_output_copy_aux(struct perf_output_handle *aux_handle,
1668 struct perf_output_handle *handle,
1669 unsigned long from, unsigned long to);
1670 extern int perf_swevent_get_recursion_context(void);
1671 extern void perf_swevent_put_recursion_context(int rctx);
1672 extern u64 perf_swevent_set_period(struct perf_event *event);
1673 extern void perf_event_enable(struct perf_event *event);
1674 extern void perf_event_disable(struct perf_event *event);
1675 extern void perf_event_disable_local(struct perf_event *event);
1676 extern void perf_event_disable_inatomic(struct perf_event *event);
1677 extern void perf_event_task_tick(void);
1678 extern int perf_event_account_interrupt(struct perf_event *event);
1679 extern int perf_event_period(struct perf_event *event, u64 value);
1680 extern u64 perf_event_pause(struct perf_event *event, bool reset);
1681 #else /* !CONFIG_PERF_EVENTS: */
> 1682 static void perf_event_addr_filters_sync(struct perf_event *event) { }
> 1683 static u64 perf_event_read_value(struct perf_event *event,
1684 u64 *enabled, u64 *running)
1685 {
1686 return 0;
1687 }
> 1688 static void perf_event_update_userpage(struct perf_event *event) { }
> 1689 static void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
> 1690 static void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) { }
> 1691 static void perf_report_aux_output_id(struct perf_event *event, u64 hw_id) { }
> 1692 static void perf_tp_event(u16 event_type, u64 count, void *record,
1693 int entry_size, struct pt_regs *regs,
1694 struct hlist_head *head, int rctx,
1695 struct task_struct *task)
1696 {
1697 }
> 1698 static int perf_pmu_register(struct pmu *pmu, const char *name, int type)
1699 {
1700 return -1;
1701 }
> 1702 extern void perf_pmu_unregister(struct pmu *pmu) { }
1703 static struct perf_event *
> 1704 perf_event_create_kernel_counter(struct perf_event_attr *attr,
1705 int cpu,
1706 struct task_struct *task,
1707 perf_overflow_handler_t callback,
1708 void *context)
1709 {
1710 return NULL;
1711 }
> 1712 static void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu) { }
> 1713 static ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
1714 char *page)
1715 {
1716 return -1;
1717 }
1718 static inline void *
1719 perf_aux_output_begin(struct perf_output_handle *handle,
1720 struct perf_event *event) { return NULL; }
1721 static inline void
1722 perf_aux_output_end(struct perf_output_handle *handle, unsigned long size)
1723 { }
1724 static inline int
1725 perf_aux_output_skip(struct perf_output_handle *handle,
1726 unsigned long size) { return -EINVAL; }
1727 static inline void *
1728 perf_get_aux(struct perf_output_handle *handle) { return NULL; }
1729 static inline void
1730 perf_event_task_migrate(struct task_struct *task) { }
1731 static inline void
1732 perf_event_task_sched_in(struct task_struct *prev,
1733 struct task_struct *task) { }
1734 static inline void
1735 perf_event_task_sched_out(struct task_struct *prev,
1736 struct task_struct *next) { }
1737 static inline int perf_event_init_task(struct task_struct *child,
1738 u64 clone_flags) { return 0; }
1739 static inline void perf_event_exit_task(struct task_struct *child) { }
1740 static inline void perf_event_free_task(struct task_struct *task) { }
1741 static inline void perf_event_delayed_put(struct task_struct *task) { }
1742 static inline struct file *perf_event_get(unsigned int fd) { return ERR_PTR(-EINVAL); }
1743 static inline const struct perf_event *perf_get_event(struct file *file)
1744 {
1745 return ERR_PTR(-EINVAL);
1746 }
1747 static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event)
1748 {
1749 return ERR_PTR(-EINVAL);
1750 }
1751 static inline int perf_event_read_local(struct perf_event *event, u64 *value,
1752 u64 *enabled, u64 *running)
1753 {
1754 return -EINVAL;
1755 }
1756 static inline void perf_event_print_debug(void) { }
1757 static inline int perf_event_task_disable(void) { return -EINVAL; }
1758 static inline int perf_event_task_enable(void) { return -EINVAL; }
1759 static inline int perf_event_refresh(struct perf_event *event, int refresh)
1760 {
1761 return -EINVAL;
1762 }
1763

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