Re: [acrn:6.17/linux 51/3102] arch/x86/events/intel/ds.c:2881:24: warning: cast from pointer to integer of different size

["Mi, Dapeng" <dapeng1.mi@linux.intel.com>]

This warning has been fixed in upstream tree and It seems the acrn kernel
still uses the old patches. Thanks.

On 2/27/2026 3:39 PM, kernel test robot wrote:
> Hi Dapeng,
>
> FYI, the error/warning still remains.
>
> tree:   https://github.com/projectacrn/acrn-kernel 6.17/linux
> head:   eac6d3b7a20ffb9d3102dbdc152241a7184a63cd
> commit: 67977912bebfec14bf4c0ced6c01df309725fc8d [51/3102] perf/x86/intel: Process arch-PEBS records or record fragments
> config: i386-allnoconfig (https://download.01.org/0day-ci/archive/20260227/202602271552.8NPMraId-lkp@intel.com/config)
> compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260227/202602271552.8NPMraId-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/202602271552.8NPMraId-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>    arch/x86/events/intel/ds.c: In function 'intel_pmu_drain_arch_pebs':
>>> arch/x86/events/intel/ds.c:2881:24: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
>     2881 |         top = (void *)((u64)cpuc->ds_pebs_vaddr +
>          |                        ^
>>> arch/x86/events/intel/ds.c:2881:15: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
>     2881 |         top = (void *)((u64)cpuc->ds_pebs_vaddr +
>          |               ^
>
>
> vim +2881 arch/x86/events/intel/ds.c
>
>   2860	
>   2861	static void intel_pmu_drain_arch_pebs(struct pt_regs *iregs,
>   2862					      struct perf_sample_data *data)
>   2863	{
>   2864		short counts[INTEL_PMC_IDX_FIXED + MAX_FIXED_PEBS_EVENTS] = {};
>   2865		void *last[INTEL_PMC_IDX_FIXED + MAX_FIXED_PEBS_EVENTS];
>   2866		struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
>   2867		union arch_pebs_index index;
>   2868		struct x86_perf_regs perf_regs;
>   2869		struct pt_regs *regs = &perf_regs.regs;
>   2870		void *base, *at, *top;
>   2871		u64 mask;
>   2872	
>   2873		rdmsrq(MSR_IA32_PEBS_INDEX, index.full);
>   2874	
>   2875		if (unlikely(!index.split.wr)) {
>   2876			intel_pmu_pebs_event_update_no_drain(cpuc, X86_PMC_IDX_MAX);
>   2877			return;
>   2878		}
>   2879	
>   2880		base = cpuc->ds_pebs_vaddr;
>> 2881		top = (void *)((u64)cpuc->ds_pebs_vaddr +
>   2882			       (index.split.wr << ARCH_PEBS_INDEX_WR_SHIFT));
>   2883	
>   2884		mask = hybrid(cpuc->pmu, arch_pebs_cap).counters & cpuc->pebs_enabled;
>   2885	
>   2886		if (!iregs)
>   2887			iregs = &dummy_iregs;
>   2888	
>   2889		/* Process all but the last event for each counter. */
>   2890		for (at = base; at < top;) {
>   2891			struct arch_pebs_header *header;
>   2892			struct arch_pebs_basic *basic;
>   2893			u64 pebs_status;
>   2894	
>   2895			header = at;
>   2896	
>   2897			if (WARN_ON_ONCE(!header->size))
>   2898				break;
>   2899	
>   2900			/* 1st fragment or single record must have basic group */
>   2901			if (!header->basic) {
>   2902				at += header->size;
>   2903				continue;
>   2904			}
>   2905	
>   2906			basic = at + sizeof(struct arch_pebs_header);
>   2907			pebs_status = mask & basic->applicable_counters;
>   2908			__intel_pmu_handle_pebs_record(iregs, regs, data, at,
>   2909						       pebs_status, counts, last,
>   2910						       setup_arch_pebs_sample_data);
>   2911	
>   2912			/* Skip non-last fragments */
>   2913			while (arch_pebs_record_continued(header)) {
>   2914				if (!header->size)
>   2915					break;
>   2916				at += header->size;
>   2917				header = at;
>   2918			}
>   2919	
>   2920			/* Skip last fragment or the single record */
>   2921			at += header->size;
>   2922		}
>   2923	
>   2924		__intel_pmu_handle_last_pebs_record(iregs, regs, data, mask, counts,
>   2925						    last, setup_arch_pebs_sample_data);
>   2926	
>   2927		index.split.wr = 0;
>   2928		index.split.full = 0;
>   2929		wrmsrq(MSR_IA32_PEBS_INDEX, index.full);
>   2930	}
>   2931	
>