[PATCH v2 1/4] memcg: correct RESOURCE_MAX to ULLONG_MAX

[Qiang Huang <h.huangqiang@huawei.com>]

From: Sha Zhengju <handai.szj@taobao.com>

Current RESOURCE_MAX is ULONG_MAX, but the value we used to set resource
limit is unsigned long long, so we can set bigger value than that which
is strange. The XXX_MAX should be reasonable max value, bigger than that
should be overflow.

Notice that this change will affect user output of default *.limit_in_bytes:
before change:
$ cat /cgroup/memory/memory.limit_in_bytes
9223372036854775807

after change:
$ cat /cgroup/memory/memory.limit_in_bytes
18446744073709551615

But it doesn't alter the API in term of input - we can still use
"echo -1 > *.limit_in_bytes" to reset the numbers to "unlimited".

Signed-off-by: Sha Zhengju <handai.szj@taobao.com>
Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
---
 include/linux/res_counter.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 96a509b..586bc7c 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -54,7 +54,7 @@ struct res_counter {
 	struct res_counter *parent;
 };
 
-#define RESOURCE_MAX (unsigned long long)LLONG_MAX
+#define RESOURCE_MAX ULLONG_MAX
 
 /**
  * Helpers to interact with userspace
-- 
1.8.3


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