Re: [PATCH v2 2/5] perf kvm: Introduce guest interfaces for sampling callchains

[kernel test robot <lkp@intel.com>]

:::::: 
:::::: Manual check reason: "low confidence static check warning: include/linux/perf_event.h:1531:41: sparse: sparse: no identifier for function argument"
:::::: 

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References: <SY4P282MB10842B9353422CD2C86DCB929DCFA@SY4P282MB1084.AUSP282.PROD.OUTLOOK.COM>
TO: Tianyi Liu <i.pear@outlook.com>
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CC: Tianyi Liu <i.pear@outlook.com>

Hi Tianyi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 8a749fd1a8720d4619c91c8b6e7528c0a355c0aa]

url:    https://github.com/intel-lab-lkp/linux/commits/Tianyi-Liu/KVM-Add-arch-specific-interfaces-for-sampling-guest-callchains/20231008-230042
base:   8a749fd1a8720d4619c91c8b6e7528c0a355c0aa
patch link:    https://lore.kernel.org/r/SY4P282MB10842B9353422CD2C86DCB929DCFA%40SY4P282MB1084.AUSP282.PROD.OUTLOOK.COM
patch subject: [PATCH v2 2/5] perf kvm: Introduce guest interfaces for sampling callchains
:::::: branch date: 4 days ago
:::::: commit date: 4 days ago
config: i386-randconfig-062-20231012 (https://download.01.org/0day-ci/archive/20231013/202310130614.KeOsd089-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231013/202310130614.KeOsd089-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202310130614.KeOsd089-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   fs/netfs/main.c: note: in included file (through include/linux/trace_events.h, include/trace/trace_events.h, include/trace/define_trace.h, ...):
>> include/linux/perf_event.h:1531:41: sparse: sparse: no identifier for function argument
   include/linux/perf_event.h:1531:48: sparse: sparse: no identifier for function argument
   include/linux/perf_event.h:1531:55: sparse: sparse: no identifier for function argument

vim +1531 include/linux/perf_event.h

87b940a0675e25 Sean Christopherson 2021-11-11  1504  
1c3430516b0732 Sean Christopherson 2021-11-11  1505  static inline unsigned int perf_guest_state(void)
1c3430516b0732 Sean Christopherson 2021-11-11  1506  {
87b940a0675e25 Sean Christopherson 2021-11-11  1507  	return static_call(__perf_guest_state)();
1c3430516b0732 Sean Christopherson 2021-11-11  1508  }
1c3430516b0732 Sean Christopherson 2021-11-11  1509  static inline unsigned long perf_guest_get_ip(void)
1c3430516b0732 Sean Christopherson 2021-11-11  1510  {
87b940a0675e25 Sean Christopherson 2021-11-11  1511  	return static_call(__perf_guest_get_ip)();
1c3430516b0732 Sean Christopherson 2021-11-11  1512  }
7b615fa3e48fd3 Tianyi Liu          2023-10-08  1513  static inline unsigned long perf_guest_get_frame_pointer(void)
7b615fa3e48fd3 Tianyi Liu          2023-10-08  1514  {
7b615fa3e48fd3 Tianyi Liu          2023-10-08  1515  	return static_call(__perf_guest_get_frame_pointer)();
7b615fa3e48fd3 Tianyi Liu          2023-10-08  1516  }
7b615fa3e48fd3 Tianyi Liu          2023-10-08  1517  static inline bool perf_guest_read_virt(void *addr, void *dest, unsigned int length)
7b615fa3e48fd3 Tianyi Liu          2023-10-08  1518  {
7b615fa3e48fd3 Tianyi Liu          2023-10-08  1519  	return static_call(__perf_guest_read_virt)(addr, dest, length);
7b615fa3e48fd3 Tianyi Liu          2023-10-08  1520  }
1c3430516b0732 Sean Christopherson 2021-11-11  1521  static inline unsigned int perf_guest_handle_intel_pt_intr(void)
1c3430516b0732 Sean Christopherson 2021-11-11  1522  {
87b940a0675e25 Sean Christopherson 2021-11-11  1523  	return static_call(__perf_guest_handle_intel_pt_intr)();
1c3430516b0732 Sean Christopherson 2021-11-11  1524  }
2934e3d09350c1 Sean Christopherson 2021-11-11  1525  extern void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs);
2934e3d09350c1 Sean Christopherson 2021-11-11  1526  extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs);
2aef6f306b39bb Sean Christopherson 2021-11-11  1527  #else
2aef6f306b39bb Sean Christopherson 2021-11-11  1528  static inline unsigned int perf_guest_state(void)		 { return 0; }
2aef6f306b39bb Sean Christopherson 2021-11-11  1529  static inline unsigned long perf_guest_get_ip(void)		 { return 0; }
7b615fa3e48fd3 Tianyi Liu          2023-10-08  1530  static inline unsigned long perf_guest_get_frame_pointer(void)	{ return 0; }
7b615fa3e48fd3 Tianyi Liu          2023-10-08 @1531  static inline bool perf_guest_read_virt(void*, void*, unsigned int)	{ return 0; }
2aef6f306b39bb Sean Christopherson 2021-11-11  1532  static inline unsigned int perf_guest_handle_intel_pt_intr(void) { return 0; }
2aef6f306b39bb Sean Christopherson 2021-11-11  1533  #endif /* CONFIG_GUEST_PERF_EVENTS */
39447b386c846b Zhang, Yanmin       2010-04-19  1534  

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