linux-kernel - arch/powerpc/perf/vpa-dtl.c:254:30: sparse: sparse: incorrect type in assignment (different base types)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <202512151425.cwUtLbPF-lkp@intel.com>
Date: Mon, 15 Dec 2025 15:05:27 +0800
From: kernel test robot <lkp@...el.com>
To: Kajol Jain <kjain@...ux.ibm.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Madhavan Srinivasan <maddy@...ux.ibm.com>
Subject: arch/powerpc/perf/vpa-dtl.c:254:30: sparse: sparse: incorrect type
 in assignment (different base types)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8f0b4cce4481fb22653697cced8d0d04027cb1e8
commit: 4708fba19adee9ba14ef28af6face4ab043d9cd6 powerpc/vpa_dtl: Add interface to expose vpa dtl counters via perf
date:   3 months ago
config: powerpc64-randconfig-r133-20251215 (https://download.01.org/0day-ci/archive/20251215/202512151425.cwUtLbPF-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251215/202512151425.cwUtLbPF-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/202512151425.cwUtLbPF-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/powerpc/perf/vpa-dtl.c:254:30: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int [usertype] @@     got restricted __be32 [usertype] @@
   arch/powerpc/perf/vpa-dtl.c:254:30: sparse:     expected unsigned int [usertype]
   arch/powerpc/perf/vpa-dtl.c:254:30: sparse:     got restricted __be32 [usertype]

vim +254 arch/powerpc/perf/vpa-dtl.c

   241	
   242	static int vpa_dtl_event_add(struct perf_event *event, int flags)
   243	{
   244		int ret, hwcpu;
   245		unsigned long addr;
   246		struct vpa_dtl *dtl = &per_cpu(vpa_dtl_cpu, event->cpu);
   247	
   248		/*
   249		 * Register our dtl buffer with the hypervisor. The
   250		 * HV expects the buffer size to be passed in the second
   251		 * word of the buffer. Refer section '14.11.3.2. H_REGISTER_VPA'
   252		 * from PAPR for more information.
   253		 */
 > 254		((u32 *)dtl->buf)[1] = cpu_to_be32(DISPATCH_LOG_BYTES);
   255		dtl->last_idx = 0;
   256	
   257		hwcpu = get_hard_smp_processor_id(event->cpu);
   258		addr = __pa(dtl->buf);
   259	
   260		ret = register_dtl(hwcpu, addr);
   261		if (ret) {
   262			pr_warn("DTL registration for cpu %d (hw %d) failed with %d\n",
   263				event->cpu, hwcpu, ret);
   264			return ret;
   265		}
   266	
   267		/* set our initial buffer indices */
   268		lppaca_of(event->cpu).dtl_idx = 0;
   269	
   270		/*
   271		 * Ensure that our updates to the lppaca fields have
   272		 * occurred before we actually enable the logging
   273		 */
   274		smp_wmb();
   275	
   276		/* enable event logging */
   277		lppaca_of(event->cpu).dtl_enable_mask = event->attr.config;
   278	
   279		vpa_dtl_start_hrtimer(event);
   280	
   281		return 0;
   282	}
   283	

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