linux-kernel - drivers/irqchip/irq-gic-v5-its.c:854:13: sparse: sparse: restricted _

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Message-ID: <202512131849.30ZRTBeR-lkp@intel.com>
Date: Sat, 13 Dec 2025 18:56:34 +0800
From: kernel test robot <lkp@...el.com>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Marc Zyngier <maz@...nel.org>
Subject: drivers/irqchip/irq-gic-v5-its.c:854:13: sparse: sparse: restricted
 __le64 degrades to integer

Hi Lorenzo,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a859eca0e4cc96f63ff125dbe5388d961558b0e9
commit: 53bb952a625fd3247647c7a28366ce990a579415 arm64: Kconfig: Enable GICv5
date:   5 months ago
config: arm64-randconfig-r113-20251213 (https://download.01.org/0day-ci/archive/20251213/202512131849.30ZRTBeR-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251213/202512131849.30ZRTBeR-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/202512131849.30ZRTBeR-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/irqchip/irq-gic-v5-its.c:854:13: sparse: sparse: cast to restricted __le64
>> drivers/irqchip/irq-gic-v5-its.c:854:13: sparse: sparse: restricted __le64 degrades to integer
>> drivers/irqchip/irq-gic-v5-its.c:854:13: sparse: sparse: restricted __le64 degrades to integer

vim +854 drivers/irqchip/irq-gic-v5-its.c

57d72196dfc850 Lorenzo Pieralisi 2025-07-03  845  
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  846  static int gicv5_its_map_event(struct gicv5_its_dev *its_dev, u16 event_id, u32 lpi)
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  847  {
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  848  	struct gicv5_its_chip_data *its = its_dev->its_node;
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  849  	u64 itt_entry;
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  850  	__le64 *itte;
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  851  
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  852  	itte = gicv5_its_device_get_itte_ref(its_dev, event_id);
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  853  
57d72196dfc850 Lorenzo Pieralisi 2025-07-03 @854  	if (FIELD_GET(GICV5_ITTL2E_VALID, *itte))
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  855  		return -EEXIST;
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  856  
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  857  	itt_entry = FIELD_PREP(GICV5_ITTL2E_LPI_ID, lpi) |
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  858  		    FIELD_PREP(GICV5_ITTL2E_VALID, 0x1);
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  859  
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  860  	its_write_table_entry(its, itte, itt_entry);
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  861  
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  862  	gicv5_its_itt_cache_inv(its, its_dev->device_id, event_id);
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  863  
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  864  	return 0;
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  865  }
57d72196dfc850 Lorenzo Pieralisi 2025-07-03  866  

:::::: The code at line 854 was first introduced by commit
:::::: 57d72196dfc8502b7e376ecdffb11c4f8766f26d irqchip/gic-v5: Add GICv5 ITS support

:::::: TO: Lorenzo Pieralisi <lpieralisi@...nel.org>
:::::: CC: Marc Zyngier <maz@...nel.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki