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Subjectarch/x86/xen/enlighten_pvh.c:26:13: warning: no previous prototype for '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: a180bd1d7e16173d965b263c5a536aa40afa2a2a
commit: 34aff14580d1b02971adfd63be994f9c045919aa xen: Remove Xen PVH/PVHVM dependency on PCI
date: 7 months ago
config: x86_64-buildonly-randconfig-r002-20210705 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# 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
make W=1 ARCH=x86_64

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

All warnings (new ones prefixed by >>):

>> arch/x86/xen/enlighten_pvh.c:26:13: warning: no previous prototype for 'xen_pvh_init' [-Wmissing-prototypes]
26 | void __init xen_pvh_init(struct boot_params *boot_params)
| ^~~~~~~~~~~~
>> arch/x86/xen/enlighten_pvh.c:42:13: warning: no previous prototype for 'mem_map_via_hcall' [-Wmissing-prototypes]
42 | void __init mem_map_via_hcall(struct boot_params *boot_params_p)
| ^~~~~~~~~~~~~~~~~


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

8cee3974b35bfb Maran Wilson 2018-12-10 25
72813bfbf0276a Roger Pau Monne 2019-04-23 @26 void __init xen_pvh_init(struct boot_params *boot_params)
8cee3974b35bfb Maran Wilson 2018-12-10 27 {
8cee3974b35bfb Maran Wilson 2018-12-10 28 u32 msr;
8cee3974b35bfb Maran Wilson 2018-12-10 29 u64 pfn;
8cee3974b35bfb Maran Wilson 2018-12-10 30
8cee3974b35bfb Maran Wilson 2018-12-10 31 xen_pvh = 1;
c9f804d64bb93c Roger Pau Monne 2019-04-23 32 xen_domain_type = XEN_HVM_DOMAIN;
8cee3974b35bfb Maran Wilson 2018-12-10 33 xen_start_flags = pvh_start_info.flags;
8cee3974b35bfb Maran Wilson 2018-12-10 34
8cee3974b35bfb Maran Wilson 2018-12-10 35 msr = cpuid_ebx(xen_cpuid_base() + 2);
8cee3974b35bfb Maran Wilson 2018-12-10 36 pfn = __pa(hypercall_page);
8cee3974b35bfb Maran Wilson 2018-12-10 37 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
72813bfbf0276a Roger Pau Monne 2019-04-23 38
72813bfbf0276a Roger Pau Monne 2019-04-23 39 xen_efi_init(boot_params);
8cee3974b35bfb Maran Wilson 2018-12-10 40 }
a43fb7da53007e Maran Wilson 2018-12-10 41
a43fb7da53007e 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@citrix.com>
:::::: CC: Boris Ostrovsky <boris.ostrovsky@oracle.com>

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