linux-kernel - Re: [Kernel-patch-test] [PATCH v1] kernel/trace:check the val against the available mem

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Date:   Fri, 30 Mar 2018 14:53:34 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Zhaoyang Huang <huangzhaoyang@...il.com>
Cc:     kbuild-all@...org, Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        kernel-patch-test@...ts.linaro.org
Subject: Re: [Kernel-patch-test] [PATCH v1] kernel/trace:check the val
 against the available mem

Hi Zhaoyang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.16-rc7 next-20180329]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Zhaoyang-Huang/kernel-trace-check-the-val-against-the-available-mem/20180330-140917
config: i386-randconfig-x073-201812 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   kernel/trace/trace.c: In function 'get_available_mem':
>> kernel/trace/trace.c:5992:16: error: implicit declaration of function 'global_page_state'; did you mean 'zone_page_state'? [-Werror=implicit-function-declaration]
      pages[lru] = global_page_state(NR_LRU_BASE + lru);
                   ^~~~~~~~~~~~~~~~~
                   zone_page_state
   In file included from include/asm-generic/bug.h:18:0,
                    from arch/x86/include/asm/bug.h:83,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/mm.h:9,
                    from include/linux/ring_buffer.h:5,
                    from kernel/trace/trace.c:14:
   include/linux/kernel.h:793:16: warning: comparison of distinct pointer types lacks a cast
     (void) (&min1 == &min2);   \
                   ^
   include/linux/kernel.h:802:2: note: in expansion of macro '__min'
     __min(typeof(x), typeof(y),   \
     ^~~~~
>> kernel/trace/trace.c:6004:3: note: in expansion of macro 'min'
      min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
      ^~~
   cc1: some warnings being treated as errors

vim +5992 kernel/trace/trace.c

  5977	
  5978	static long get_available_mem(void)
  5979	{
  5980		struct sysinfo i;
  5981		long available;
  5982		unsigned long pagecache;
  5983		unsigned long wmark_low = 0;
  5984		unsigned long pages[NR_LRU_LISTS];
  5985		struct zone *zone;
  5986		int lru;
  5987	
  5988		si_meminfo(&i);
  5989		si_swapinfo(&i);
  5990	
  5991		for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
> 5992			pages[lru] = global_page_state(NR_LRU_BASE + lru);
  5993	
  5994		for_each_zone(zone)
  5995			wmark_low += zone->watermark[WMARK_LOW];
  5996	
  5997		available = i.freeram - wmark_low;
  5998	
  5999		pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
  6000		pagecache -= min(pagecache / 2, wmark_low);
  6001		available += pagecache;
  6002	
  6003		available += global_page_state(NR_SLAB_RECLAIMABLE) -
> 6004			min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
  6005	
  6006		if (available < 0)
  6007			available = 0;
  6008		return available;
  6009	}
  6010	

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