linux-kernel - arch/x86/xen/enlighten_pvh.c:26:13: warning: no previous prototype for function 'xen_pvh

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Message-ID: <202111071227.RChIcejZ-lkp@intel.com>
Date:   Sun, 7 Nov 2021 12:28:32 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jason Andryuk <jandryuk@...il.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Juergen Gross <jgross@...e.com>
Subject: arch/x86/xen/enlighten_pvh.c:26:13: warning: no previous prototype
 for function 'xen_pvh_init'

Hi Jason,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b5013d084e03e82ceeab4db8ae8ceeaebe76b0eb
commit: 34aff14580d1b02971adfd63be994f9c045919aa xen: Remove Xen PVH/PVHVM dependency on PCI
date:   11 months ago
config: x86_64-buildonly-randconfig-r006-20211006 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c0039de2953d15815448b4b3c3bafb45607781e0)
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=34aff14580d1b02971adfd63be994f9c045919aa
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 34aff14580d1b02971adfd63be994f9c045919aa
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> arch/x86/xen/enlighten_pvh.c:26:13: warning: no previous prototype for function 'xen_pvh_init' [-Wmissing-prototypes]
   void __init xen_pvh_init(struct boot_params *boot_params)
               ^
   arch/x86/xen/enlighten_pvh.c:26:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init xen_pvh_init(struct boot_params *boot_params)
   ^
   static 
>> arch/x86/xen/enlighten_pvh.c:42:13: warning: no previous prototype for function 'mem_map_via_hcall' [-Wmissing-prototypes]
   void __init mem_map_via_hcall(struct boot_params *boot_params_p)
               ^
   arch/x86/xen/enlighten_pvh.c:42:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init mem_map_via_hcall(struct boot_params *boot_params_p)
   ^
   static 
   2 warnings generated.


vim +/xen_pvh_init +26 arch/x86/xen/enlighten_pvh.c

8cee3974b35bfb2 Maran Wilson    2018-12-10  25  
72813bfbf0276a9 Roger Pau Monne 2019-04-23 @26  void __init xen_pvh_init(struct boot_params *boot_params)
8cee3974b35bfb2 Maran Wilson    2018-12-10  27  {
8cee3974b35bfb2 Maran Wilson    2018-12-10  28  	u32 msr;
8cee3974b35bfb2 Maran Wilson    2018-12-10  29  	u64 pfn;
8cee3974b35bfb2 Maran Wilson    2018-12-10  30  
8cee3974b35bfb2 Maran Wilson    2018-12-10  31  	xen_pvh = 1;
c9f804d64bb93c8 Roger Pau Monne 2019-04-23  32  	xen_domain_type = XEN_HVM_DOMAIN;
8cee3974b35bfb2 Maran Wilson    2018-12-10  33  	xen_start_flags = pvh_start_info.flags;
8cee3974b35bfb2 Maran Wilson    2018-12-10  34  
8cee3974b35bfb2 Maran Wilson    2018-12-10  35  	msr = cpuid_ebx(xen_cpuid_base() + 2);
8cee3974b35bfb2 Maran Wilson    2018-12-10  36  	pfn = __pa(hypercall_page);
8cee3974b35bfb2 Maran Wilson    2018-12-10  37  	wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
72813bfbf0276a9 Roger Pau Monne 2019-04-23  38  
72813bfbf0276a9 Roger Pau Monne 2019-04-23  39  	xen_efi_init(boot_params);
8cee3974b35bfb2 Maran Wilson    2018-12-10  40  }
a43fb7da53007e6 Maran Wilson    2018-12-10  41  
a43fb7da53007e6 Maran Wilson    2018-12-10 @42  void __init mem_map_via_hcall(struct boot_params *boot_params_p)

:::::: The code at line 26 was first introduced by commit
:::::: 72813bfbf0276a97c82af038efb5f02dcdd9e310 xen/pvh: correctly setup the PV EFI interface for dom0

:::::: TO: Roger Pau Monne <roger.pau@...rix.com>
:::::: CC: Boris Ostrovsky <boris.ostrovsky@...cle.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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