[agraf-2.6:snp-host-v10 65/108] arch/x86/virt/svm/sev.c:352:6: warning: no previous prototype for 'sev_dump_hva_rmpentry'

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

tree:   https://github.com/agraf/linux-2.6.git snp-host-v10
head:   689d7ab69df8f6bff29bd1dbefe7c07bba52a9ac
commit: 7187f30c29e7c30b39e34bb3ab06ecbf034800ab [65/108] x86/fault: Add helper for dumping RMP entries
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20231109/202311092152.UjfN6FW5-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/20231109/202311092152.UjfN6FW5-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/oe-kbuild-all/202311092152.UjfN6FW5-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/x86/virt/svm/sev.c:280:5: warning: no previous prototype for 'snp_lookup_rmpentry' [-Wmissing-prototypes]
     280 | int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level)
         |     ^~~~~~~~~~~~~~~~~~~
>> arch/x86/virt/svm/sev.c:352:6: warning: no previous prototype for 'sev_dump_hva_rmpentry' [-Wmissing-prototypes]
     352 | void sev_dump_hva_rmpentry(unsigned long hva)
         |      ^~~~~~~~~~~~~~~~~~~~~


vim +/sev_dump_hva_rmpentry +352 arch/x86/virt/svm/sev.c

   279	
 > 280	int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level)
   281	{
   282		struct rmpentry e;
   283		int ret;
   284	
   285		ret = __snp_lookup_rmpentry(pfn, &e, level);
   286		if (ret)
   287			return ret;
   288	
   289		*assigned = !!e.assigned;
   290		return 0;
   291	}
   292	EXPORT_SYMBOL_GPL(snp_lookup_rmpentry);
   293	
   294	/*
   295	 * Dump the raw RMP entry for a particular PFN. These bits are documented in the
   296	 * PPR for a particular CPU model and provide useful information about how a
   297	 * particular PFN is being utilized by the kernel/firmware at the time certain
   298	 * unexpected events occur, such as RMP faults.
   299	 */
   300	static void sev_dump_rmpentry(u64 dumped_pfn)
   301	{
   302		struct rmpentry e;
   303		u64 pfn, pfn_end;
   304		int level, ret;
   305		u64 *e_data;
   306	
   307		ret = __snp_lookup_rmpentry(dumped_pfn, &e, &level);
   308		if (ret) {
   309			pr_info("Failed to read RMP entry for PFN 0x%llx, error %d\n",
   310				dumped_pfn, ret);
   311			return;
   312		}
   313	
   314		e_data = (u64 *)&e;
   315		if (e.assigned) {
   316			pr_info("RMP entry for PFN 0x%llx: [high=0x%016llx low=0x%016llx]\n",
   317				dumped_pfn, e_data[1], e_data[0]);
   318			return;
   319		}
   320	
   321		/*
   322		 * If the RMP entry for a particular PFN is not in an assigned state,
   323		 * then it is sometimes useful to get an idea of whether or not any RMP
   324		 * entries for other PFNs within the same 2MB region are assigned, since
   325		 * those too can affect the ability to access a particular PFN in
   326		 * certain situations, such as when the PFN is being accessed via a 2MB
   327		 * mapping in the host page table.
   328		 */
   329		pfn = ALIGN(dumped_pfn, PTRS_PER_PMD);
   330		pfn_end = pfn + PTRS_PER_PMD;
   331	
   332		while (pfn < pfn_end) {
   333			ret = __snp_lookup_rmpentry(pfn, &e, &level);
   334			if (ret) {
   335				pr_info_ratelimited("Failed to read RMP entry for PFN 0x%llx\n", pfn);
   336				pfn++;
   337				continue;
   338			}
   339	
   340			if (e_data[0] || e_data[1]) {
   341				pr_info("No assigned RMP entry for PFN 0x%llx, but the 2MB region contains populated RMP entries, e.g.: PFN 0x%llx: [high=0x%016llx low=0x%016llx]\n",
   342					dumped_pfn, pfn, e_data[1], e_data[0]);
   343				return;
   344			}
   345			pfn++;
   346		}
   347	
   348		pr_info("No populated RMP entries in the 2MB region containing PFN 0x%llx\n",
   349			dumped_pfn);
   350	}
   351	
 > 352	void sev_dump_hva_rmpentry(unsigned long hva)

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