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SubjectRe: [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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