[linux-stable-rc:linux-4.19.y 7844/9999] fs/proc/page.c:49:11: note: in expansion of macro 'pfn_to_online_page'

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

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Hi David,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y
head:   672481c2deffb371d8a7dfdc009e44c09864a869
commit: 6ea856efef9f5c5a1a8e558ce67f72b37e2cd2a9 [7844/9999] fs/proc/page.c: don't access uninitialized memmaps in fs/proc/page.c
config: ia64-randconfig-a001-20191226 (attached as .config)
compiler: ia64-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 6ea856efef9f5c5a1a8e558ce67f72b37e2cd2a9
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=ia64 

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

All warnings (new ones prefixed by >>):

   In file included from arch/ia64/include/asm/ptrace.h:46:0,
                    from arch/ia64/include/asm/processor.h:20,
                    from arch/ia64/include/asm/thread_info.h:12,
                    from include/linux/thread_info.h:38,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/ia64/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:81,
                    from include/linux/spinlock.h:51,
                    from include/linux/mmzone.h:8,
                    from include/linux/bootmem.h:8,
                    from fs/proc/page.c:2:
   fs/proc/page.c: In function 'kpagecount_read':
   arch/ia64/include/asm/page.h:118:36: error: 'max_mapnr' undeclared (first use in this function); did you mean 'dax_mapping'?
    # define pfn_valid(pfn)  (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
                                       ^
   include/linux/memory_hotplug.h:225:6: note: in expansion of macro 'pfn_valid'
     if (pfn_valid(pfn))   \
         ^~~~~~~~~
>> fs/proc/page.c:49:11: note: in expansion of macro 'pfn_to_online_page'
      ppage = pfn_to_online_page(pfn);
              ^~~~~~~~~~~~~~~~~~
   arch/ia64/include/asm/page.h:118:36: note: each undeclared identifier is reported only once for each function it appears in
    # define pfn_valid(pfn)  (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
                                       ^
   include/linux/memory_hotplug.h:225:6: note: in expansion of macro 'pfn_valid'
     if (pfn_valid(pfn))   \
         ^~~~~~~~~
>> fs/proc/page.c:49:11: note: in expansion of macro 'pfn_to_online_page'
      ppage = pfn_to_online_page(pfn);
              ^~~~~~~~~~~~~~~~~~
   fs/proc/page.c: In function 'kpageflags_read':
   arch/ia64/include/asm/page.h:118:36: error: 'max_mapnr' undeclared (first use in this function); did you mean 'dax_mapping'?
    # define pfn_valid(pfn)  (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
                                       ^
   include/linux/memory_hotplug.h:225:6: note: in expansion of macro 'pfn_valid'
     if (pfn_valid(pfn))   \
         ^~~~~~~~~
   fs/proc/page.c:225:11: note: in expansion of macro 'pfn_to_online_page'
      ppage = pfn_to_online_page(pfn);
              ^~~~~~~~~~~~~~~~~~

vim +/pfn_to_online_page +49 fs/proc/page.c

   > 2	#include <linux/bootmem.h>
     3	#include <linux/compiler.h>
     4	#include <linux/fs.h>
     5	#include <linux/init.h>
     6	#include <linux/ksm.h>
     7	#include <linux/mm.h>
     8	#include <linux/mmzone.h>
     9	#include <linux/huge_mm.h>
    10	#include <linux/proc_fs.h>
    11	#include <linux/seq_file.h>
    12	#include <linux/hugetlb.h>
    13	#include <linux/memcontrol.h>
    14	#include <linux/mmu_notifier.h>
    15	#include <linux/page_idle.h>
    16	#include <linux/kernel-page-flags.h>
    17	#include <linux/uaccess.h>
    18	#include "internal.h"
    19	
    20	#define KPMSIZE sizeof(u64)
    21	#define KPMMASK (KPMSIZE - 1)
    22	#define KPMBITS (KPMSIZE * BITS_PER_BYTE)
    23	
    24	/* /proc/kpagecount - an array exposing page counts
    25	 *
    26	 * Each entry is a u64 representing the corresponding
    27	 * physical page count.
    28	 */
    29	static ssize_t kpagecount_read(struct file *file, char __user *buf,
    30				     size_t count, loff_t *ppos)
    31	{
    32		u64 __user *out = (u64 __user *)buf;
    33		struct page *ppage;
    34		unsigned long src = *ppos;
    35		unsigned long pfn;
    36		ssize_t ret = 0;
    37		u64 pcount;
    38	
    39		pfn = src / KPMSIZE;
    40		count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
    41		if (src & KPMMASK || count & KPMMASK)
    42			return -EINVAL;
    43	
    44		while (count > 0) {
    45			/*
    46			 * TODO: ZONE_DEVICE support requires to identify
    47			 * memmaps that were actually initialized.
    48			 */
  > 49			ppage = pfn_to_online_page(pfn);
    50	
    51			if (!ppage || PageSlab(ppage))
    52				pcount = 0;
    53			else
    54				pcount = page_mapcount(ppage);
    55	
    56			if (put_user(pcount, out)) {
    57				ret = -EFAULT;
    58				break;
    59			}
    60	
    61			pfn++;
    62			out++;
    63			count -= KPMSIZE;
    64	
    65			cond_resched();
    66		}
    67	
    68		*ppos += (char __user *)out - buf;
    69		if (!ret)
    70			ret = (char __user *)out - buf;
    71		return ret;
    72	}
    73	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation

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