linux-kernel - [mingo-tip:master 221/2335] drivers/xen/grant-table.c:411:22: error: implicit declaration of function 'xen_gfn_to_pfn'; did you mean 'xen_cr3_to

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Date:   Sat, 19 Mar 2022 09:55:40 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mingo-tip:master 221/2335] drivers/xen/grant-table.c:411:22: error:
 implicit declaration of function 'xen_gfn_to_pfn'; did you mean
 'xen_cr3_to_pfn'?

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git master
head:   85293bf3fca6d85608cff1447ce3097583f15fab
commit: dbfd8a446611c67366513c5798b018f9d1b6123b [221/2335] headers/prep: Rename API: gfn_to_pfn() => xen_gfn_to_pfn()
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220319/202203190905.87HwuS9w-lkp@intel.com/config)
compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=dbfd8a446611c67366513c5798b018f9d1b6123b
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip master
        git checkout dbfd8a446611c67366513c5798b018f9d1b6123b
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   In file included from arch/x86/include/asm/page.h:76,
                    from arch/x86/include/asm/thread_info.h:12,
                    from include/linux/thread_info.h:59,
                    from arch/x86/include/asm/preempt.h:7,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:55,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:6,
                    from include/linux/mm.h:10,
                    from include/linux/memblock.h:12,
                    from drivers/xen/grant-table.c:36:
   drivers/xen/grant-table.c: In function 'gnttab_add_deferred':
>> drivers/xen/grant-table.c:411:22: error: implicit declaration of function 'xen_gfn_to_pfn'; did you mean 'xen_cr3_to_pfn'? [-Werror=implicit-function-declaration]
     411 |   page = pfn_to_page(xen_gfn_to_pfn(gfn));
         |                      ^~~~~~~~~~~~~~
   include/asm-generic/memory_model.h:25:40: note: in definition of macro '__pfn_to_page'
      25 | #define __pfn_to_page(pfn) (vmemmap + (pfn))
         |                                        ^~~
   drivers/xen/grant-table.c:411:10: note: in expansion of macro 'pfn_to_page'
     411 |   page = pfn_to_page(xen_gfn_to_pfn(gfn));
         |          ^~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +411 drivers/xen/grant-table.c

   399	
   400	static void gnttab_add_deferred(grant_ref_t ref, bool readonly,
   401					struct page *page)
   402	{
   403		struct deferred_entry *entry;
   404		gfp_t gfp = (in_atomic() || irqs_disabled()) ? GFP_ATOMIC : GFP_KERNEL;
   405		const char *what = KERN_WARNING "leaking";
   406	
   407		entry = kmalloc(sizeof(*entry), gfp);
   408		if (!page) {
   409			unsigned long gfn = gnttab_interface->read_frame(ref);
   410	
 > 411			page = pfn_to_page(xen_gfn_to_pfn(gfn));
   412			get_page(page);
   413		}
   414	
   415		if (entry) {
   416			unsigned long flags;
   417	
   418			entry->ref = ref;
   419			entry->ro = readonly;
   420			entry->page = page;
   421			entry->warn_delay = 60;
   422			spin_lock_irqsave(&gnttab_list_lock, flags);
   423			list_add_tail(&entry->list, &deferred_list);
   424			if (!timer_pending(&deferred_timer)) {
   425				deferred_timer.expires = jiffies + HZ;
   426				add_timer(&deferred_timer);
   427			}
   428			spin_unlock_irqrestore(&gnttab_list_lock, flags);
   429			what = KERN_DEBUG "deferring";
   430		}
   431		printk("%s g.e. %#x (pfn %#lx)\n",
   432		       what, ref, page ? page_to_pfn(page) : -1);
   433	}
   434	

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