linux-kernel - Re: [PATCH v6 1/1] memory_hotplug: Add a bounds check to __add

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Date:   Mon, 30 Sep 2019 16:20:15 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Alastair D'Silva <alastair@....ibm.com>
Cc:     kbuild-all@...org, alastair@...ilva.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Dan Williams <dan.j.williams@...el.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/1] memory_hotplug: Add a bounds check to __add_pages

Hi Alastair,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[cannot apply to v5.3 next-20190926]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Alastair-D-Silva/Add-bounds-check-for-Hotplugged-memory/20190930-143107
config: i386-randconfig-g004-201939 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/bug.h:83:0,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/mm.h:9,
                    from mm/memory_hotplug.c:9:
   mm/memory_hotplug.c: In function 'check_hotplug_memory_addressable':
>> mm/memory_hotplug.c:289:8: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 2 has type 'unsigned int' [-Wformat=]
           "Hotplugged memory exceeds maximum addressable address, range=%#llx-%#llx, maximum=%#llx\n",
           ^
   include/asm-generic/bug.h:92:17: note: in definition of macro '__WARN_printf'
      __warn_printk(arg);     \
                    ^~~
   mm/memory_hotplug.c:288:3: note: in expansion of macro 'WARN'
      WARN(1,
      ^~~~

vim +289 mm/memory_hotplug.c

   280	
   281	static int check_hotplug_memory_addressable(unsigned long pfn,
   282						    unsigned long nr_pages)
   283	{
   284		const u64 max_addr = PFN_PHYS(pfn + nr_pages) - 1;
   285	
   286		if (max_addr >> MAX_PHYSMEM_BITS) {
   287			const u64 max_allowed = (1ull << (MAX_PHYSMEM_BITS + 1)) - 1;
   288			WARN(1,
 > 289			     "Hotplugged memory exceeds maximum addressable address, range=%#llx-%#llx, maximum=%#llx\n",
   290			     PFN_PHYS(pfn), max_addr, max_allowed);
   291			return -E2BIG;
   292		}
   293	
   294		return 0;
   295	}
   296	

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