[android-common:main-16k-gs-shusky-5.15 30/30] mm/page_alloc_debugfs.c:23:7: warning: GCC does not allow variable declarations in for loop initializers before C99

[android-common:main-16k-gs-shusky-5.15 30/30] mm/page_alloc_debugfs.c:23:7: warning: GCC does not allow variable declarations in for loop initializers before C99

[kernel test robot]

tree:   https://android.googlesource.com/kernel/common main-16k-gs-shusky-5.15
head:   339bea17e1ccb695cddcbc39f88955c85e45d97a
commit: 51fec4ca6219da87e39a3c1b94e9c05741c46b5a [30/30] ANDROID: mm: Create dirs for the page orders in the debugfs
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20260317/202603172222.5HLydAd2-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project f46a5153850c1303d687233d4adf699b01041da8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260317/202603172222.5HLydAd2-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603172222.5HLydAd2-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from <built-in>:3:
   In file included from include/linux/compiler_types.h:80:
   include/linux/compiler-clang.h:24:9: warning: '__SANITIZE_ADDRESS__' macro redefined [-Wmacro-redefined]
      24 | #define __SANITIZE_ADDRESS__
         |         ^
   <built-in>:368:9: note: previous definition is here
     368 | #define __SANITIZE_ADDRESS__ 1
         |         ^
>> mm/page_alloc_debugfs.c:23:7: warning: GCC does not allow variable declarations in for loop initializers before C99 [-Wgcc-compat]
      23 |         for (int order = 0; order < NR_PAGE_ORDERS; order++) {
         |              ^
   mm/page_alloc_debugfs.c:23:30: error: use of undeclared identifier 'NR_PAGE_ORDERS'
      23 |         for (int order = 0; order < NR_PAGE_ORDERS; order++) {
         |                                     ^~~~~~~~~~~~~~
   2 warnings and 1 error generated.


vim +23 mm/page_alloc_debugfs.c

    16	
    17	
    18	static inline void create_page_orders_subdirs(struct zone *zone, struct dentry *zonedir)
    19	{
    20		struct dentry *orderdir;
    21		char dirname[12];
    22	
  > 23		for (int order = 0; order < NR_PAGE_ORDERS; order++) {
    24			snprintf(dirname, sizeof(dirname), "order-%d", order);
    25			orderdir = debugfs_create_dir(dirname, zonedir);
    26		}
    27	}
    28	static inline void create_zones_subdirs(struct pglist_data *pgdata, struct dentry *nodedir)
    29	{
    30		struct dentry *zonedir;
    31		struct zone *zone;
    32		struct zone *node_zones = pgdata->node_zones;
    33		unsigned long flags;
    34		char dirname[24];
    35	
    36		for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
    37			if (!populated_zone(zone))
    38				continue;
    39	
    40			snprintf(dirname, sizeof(dirname), "zone-%s", zone->name);
    41			spin_lock_irqsave(&zone->lock, flags);
    42			zonedir = debugfs_create_dir(dirname, nodedir);
    43			create_page_orders_subdirs(zone, zonedir);
    44			spin_unlock_irqrestore(&zone->lock, flags);
    45		}
    46	}
    47	

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