linux-kernel - drivers/resctrl/test_mpam_devices.c:9:42: sparse: sparse: incorrect type in initializer (different address spaces)

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Message-ID: <202512160133.eAzPdJv2-lkp@intel.com>
Date: Tue, 16 Dec 2025 01:59:47 +0800
From: kernel test robot <lkp@...el.com>
To: James Morse <james.morse@....com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Ben Horgan <ben.horgan@....com>, Fenghua Yu <fenghuay@...dia.com>,
	Gavin Shan <gshan@...hat.com>,
	Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: drivers/resctrl/test_mpam_devices.c:9:42: sparse: sparse: incorrect
 type in initializer (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8f0b4cce4481fb22653697cced8d0d04027cb1e8
commit: e3565d1fd4dcf2c7ee6912094066e47c7500eaf2 arm_mpam: Add kunit test for bitmap reset
date:   4 weeks ago
config: arm64-randconfig-r133-20251215 (https://download.01.org/0day-ci/archive/20251216/202512160133.eAzPdJv2-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251216/202512160133.eAzPdJv2-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512160133.eAzPdJv2-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/resctrl/mpam_devices.c: note: in included file:
>> drivers/resctrl/test_mpam_devices.c:9:42: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected char [noderef] __iomem *buf @@     got void * @@
   drivers/resctrl/test_mpam_devices.c:9:42: sparse:     expected char [noderef] __iomem *buf
   drivers/resctrl/test_mpam_devices.c:9:42: sparse:     got void *
>> drivers/resctrl/test_mpam_devices.c:24:24: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/resctrl/mpam_devices.c:271:5: sparse: sparse: context imbalance in 'mpam_register_requestor' - wrong count at exit
   drivers/resctrl/mpam_devices.c:1218:9: sparse: sparse: context imbalance in '_msmon_read' - wrong count at exit
   drivers/resctrl/mpam_devices.c:1281:6: sparse: sparse: context imbalance in 'mpam_msmon_reset_mbwu' - wrong count at exit
   drivers/resctrl/mpam_devices.c:1632:9: sparse: sparse: context imbalance in 'mpam_cpu_online' - wrong count at exit
   drivers/resctrl/mpam_devices.c:1705:9: sparse: sparse: context imbalance in 'mpam_cpu_offline' - wrong count at exit
   drivers/resctrl/mpam_devices.c:2294:12: sparse: sparse: context imbalance in 'mpam_register_irqs' - wrong count at exit
   drivers/resctrl/mpam_devices.c:2346:9: sparse: sparse: context imbalance in 'mpam_unregister_irqs' - wrong count at exit
   drivers/resctrl/mpam_devices.c:2546:9: sparse: sparse: context imbalance in 'mpam_reset_component_locked' - wrong count at exit
   drivers/resctrl/mpam_devices.c:2567:9: sparse: sparse: context imbalance in 'mpam_reset_class_locked' - wrong count at exit
   drivers/resctrl/mpam_devices.c:2640:9: sparse: sparse: context imbalance in 'mpam_enable' - wrong count at exit
   drivers/resctrl/mpam_devices.c:2666:5: sparse: sparse: context imbalance in 'mpam_apply_config' - wrong count at exit

vim +9 drivers/resctrl/test_mpam_devices.c

     6	
     7	static void test_mpam_reset_msc_bitmap(struct kunit *test)
     8	{
   > 9		char __iomem *buf = kunit_kzalloc(test, SZ_16K, GFP_KERNEL);
    10		struct mpam_msc fake_msc = {};
    11		u32 *test_result;
    12	
    13		if (!buf)
    14			return;
    15	
    16		fake_msc.mapped_hwpage = buf;
    17		fake_msc.mapped_hwpage_sz = SZ_16K;
    18		cpumask_copy(&fake_msc.accessibility, cpu_possible_mask);
    19	
    20		/* Satisfy lockdep checks */
    21		mutex_init(&fake_msc.part_sel_lock);
    22		mutex_lock(&fake_msc.part_sel_lock);
    23	
  > 24		test_result = (u32 *)(buf + MPAMCFG_CPBM);
    25	
    26		mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 0);
    27		KUNIT_EXPECT_EQ(test, test_result[0], 0);
    28		KUNIT_EXPECT_EQ(test, test_result[1], 0);
    29		test_result[0] = 0;
    30		test_result[1] = 0;
    31	
    32		mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 1);
    33		KUNIT_EXPECT_EQ(test, test_result[0], 1);
    34		KUNIT_EXPECT_EQ(test, test_result[1], 0);
    35		test_result[0] = 0;
    36		test_result[1] = 0;
    37	
    38		mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 16);
    39		KUNIT_EXPECT_EQ(test, test_result[0], 0xffff);
    40		KUNIT_EXPECT_EQ(test, test_result[1], 0);
    41		test_result[0] = 0;
    42		test_result[1] = 0;
    43	
    44		mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 32);
    45		KUNIT_EXPECT_EQ(test, test_result[0], 0xffffffff);
    46		KUNIT_EXPECT_EQ(test, test_result[1], 0);
    47		test_result[0] = 0;
    48		test_result[1] = 0;
    49	
    50		mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 33);
    51		KUNIT_EXPECT_EQ(test, test_result[0], 0xffffffff);
    52		KUNIT_EXPECT_EQ(test, test_result[1], 1);
    53		test_result[0] = 0;
    54		test_result[1] = 0;
    55	
    56		mutex_unlock(&fake_msc.part_sel_lock);
    57	}
    58	

-- 
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https://github.com/intel/lkp-tests/wiki