Re: [PATCH v2] memcg: refactor mem_cgroup_resize_limit()

[kbuild test robot <lkp@xxxxxxxxx>]

Hi Yu,

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.12-rc3 next-20170602]
[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/Yu-Zhao/memcg-refactor-mem_cgroup_resize_limit/20170605-041444
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: x86_64-randconfig-x002-201723 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

   In file included from arch/x86/include/asm/atomic.h:4:0,
                    from include/linux/atomic.h:4,
                    from include/linux/page_counter.h:4,
                    from mm/memcontrol.c:34:
   mm/memcontrol.c: In function 'mem_cgroup_resize_limit':
   include/linux/compiler.h:156:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
     ^
   include/linux/compiler.h:154:23: note: in expansion of macro '__trace_if'
    #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
                          ^~~~~~~~~~
>> mm/memcontrol.c:2453:3: note: in expansion of macro 'if'
      if (inverted)
      ^~
   mm/memcontrol.c:2455:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
       ret = -EINVAL;
       ^~~
   In file included from arch/x86/include/asm/atomic.h:4:0,
                    from include/linux/atomic.h:4,
                    from include/linux/page_counter.h:4,
                    from mm/memcontrol.c:34:
>> include/linux/compiler.h:156:2: error: expected 'while' before 'if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
     ^
   include/linux/compiler.h:154:23: note: in expansion of macro '__trace_if'
    #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
                          ^~~~~~~~~~
   mm/memcontrol.c:2458:3: note: in expansion of macro 'if'
      if (limit > counter->limit)
      ^~
>> include/linux/compiler.h:170:3: error: expected statement before ')' token
     }))
      ^
   include/linux/compiler.h:154:23: note: in expansion of macro '__trace_if'
    #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
                          ^~~~~~~~~~
   mm/memcontrol.c:2458:3: note: in expansion of macro 'if'
      if (limit > counter->limit)
      ^~
   include/linux/compiler.h:170:4: error: expected statement before ')' token
     }))
       ^
   include/linux/compiler.h:154:23: note: in expansion of macro '__trace_if'
    #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
                          ^~~~~~~~~~
   mm/memcontrol.c:2458:3: note: in expansion of macro 'if'
      if (limit > counter->limit)
      ^~
   mm/memcontrol.c:2464:4: error: break statement not within loop or switch
       break;
       ^~~~~
   mm/memcontrol.c:2474:2: warning: no return statement in function returning non-void [-Wreturn-type]
     } while (retry_count);
     ^
   mm/memcontrol.c: At top level:
   mm/memcontrol.c:2474:4: error: expected identifier or '(' before 'while'
     } while (retry_count);
       ^~~~~
   In file included from arch/x86/include/asm/atomic.h:4:0,
                    from include/linux/atomic.h:4,
                    from include/linux/page_counter.h:4,
                    from mm/memcontrol.c:34:
>> include/linux/compiler.h:156:2: error: expected identifier or '(' before 'if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
     ^
   include/linux/compiler.h:154:23: note: in expansion of macro '__trace_if'
    #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
                          ^~~~~~~~~~
   mm/memcontrol.c:2476:2: note: in expansion of macro 'if'
     if (!ret && enlarge)
     ^~
>> include/linux/compiler.h:170:3: error: expected identifier or '(' before ')' token
     }))
      ^
   include/linux/compiler.h:154:23: note: in expansion of macro '__trace_if'
    #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
                          ^~~~~~~~~~
   mm/memcontrol.c:2476:2: note: in expansion of macro 'if'
     if (!ret && enlarge)
     ^~
   mm/memcontrol.c:2479:2: error: expected identifier or '(' before 'return'
     return ret;
     ^~~~~~
   mm/memcontrol.c:2480:1: error: expected identifier or '(' before '}' token
    }
    ^

vim +/if +2453 mm/memcontrol.c

  2437		 * of # of children which we should visit in this loop.
  2438		 */
  2439		retry_count = MEM_CGROUP_RECLAIM_RETRIES *
  2440			      mem_cgroup_count_children(memcg);
  2441	
  2442		oldusage = page_counter_read(counter);
  2443	
  2444		do {
  2445			if (signal_pending(current)) {
  2446				ret = -EINTR;
  2447				break;
  2448			}
  2449	
  2450			mutex_lock(&memcg_limit_mutex);
  2451			inverted = memsw ? limit < memcg->memory.limit :
  2452					   limit > memcg->memsw.limit;
> 2453			if (inverted)
  2454				mutex_unlock(&memcg_limit_mutex);
  2455				ret = -EINVAL;
  2456				break;
  2457			}
  2458			if (limit > counter->limit)
  2459				enlarge = true;
  2460			ret = page_counter_limit(counter, limit);
  2461			mutex_unlock(&memcg_limit_mutex);

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