[avpatel:riscv_sbi_watchdog_v1 94/98] drivers/perf/riscv_ctr.c:435:18: sparse: sparse: incorrect type in assignment (different address spaces)

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/avpatel/linux.git riscv_sbi_watchdog_v1
head:   929bf13433e242a3f255f463b2fb44633e102e0d
commit: b4cc5b9ca0cada8221e31b647640bbae515000a1 [94/98] riscv: pmu: Add driver for Control Transfer Records Ext
config: riscv-randconfig-r2304-20261108 (https://download.01.org/0day-ci/archive/20261108/202611082009.K7RVG572-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 11.5.0
sparse: v0.6.5-rc1-21-g84ec0658
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261108/202611082009.K7RVG572-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/202611082009.K7RVG572-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/perf/riscv_ctr.c:435:18: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void *task_ctx @@     got struct perf_ctx_data [noderef] __rcu * @@
   drivers/perf/riscv_ctr.c:435:18: sparse:     expected void *task_ctx
   drivers/perf/riscv_ctr.c:435:18: sparse:     got struct perf_ctx_data [noderef] __rcu *
>> drivers/perf/riscv_ctr.c:462:46: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void *ctx @@     got struct perf_ctx_data [noderef] __rcu *perf_ctx_data @@
   drivers/perf/riscv_ctr.c:462:46: sparse:     expected void *ctx
   drivers/perf/riscv_ctr.c:462:46: sparse:     got struct perf_ctx_data [noderef] __rcu *perf_ctx_data
   drivers/perf/riscv_ctr.c:477:46: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void *ctx @@     got struct perf_ctx_data [noderef] __rcu *perf_ctx_data @@
   drivers/perf/riscv_ctr.c:477:46: sparse:     expected void *ctx
   drivers/perf/riscv_ctr.c:477:46: sparse:     got struct perf_ctx_data [noderef] __rcu *perf_ctx_data

vim +435 drivers/perf/riscv_ctr.c

   416	
   417	/*
   418	 * On context switch in, we need to make sure no samples from previous tasks
   419	 * are left in the CTR.
   420	 *
   421	 * On ctxswin, sched_in = true, called after the PMU has started
   422	 * On ctxswout, sched_in = false, called before the PMU is stopped
   423	 */
   424	void riscv_pmu_ctr_sched_task(struct perf_event_pmu_context *pmu_ctx, struct task_struct *task,
   425				      bool sched_in)
   426	{
   427		struct riscv_pmu *rvpmu = to_riscv_pmu(pmu_ctx->pmu);
   428		struct cpu_hw_events *cpuc = this_cpu_ptr(rvpmu->hw_events);
   429		void *task_ctx;
   430	
   431		if (!cpuc->ctr_users)
   432			return;
   433	
   434		/* Save branch records in task_ctx on sched out */
 > 435		task_ctx = pmu_ctx ? task->perf_ctx_data : NULL;
   436		if (task_ctx) {
   437			if (sched_in)
   438				riscv_pmu_ctr_restore(task_ctx);
   439			else
   440				riscv_pmu_ctr_save(task_ctx, rvpmu->ctr_depth);
   441			return;
   442		}
   443	
   444		/* Reset branch records on sched in */
   445		if (sched_in)
   446			riscv_pmu_ctr_reset();
   447	}
   448	
   449	static inline bool branch_user_callstack(unsigned int br_type)
   450	{
   451		return (br_type & PERF_SAMPLE_BRANCH_USER) &&
   452			(br_type & PERF_SAMPLE_BRANCH_CALL_STACK);
   453	}
   454	
   455	void riscv_pmu_ctr_add(struct perf_event *event)
   456	{
   457		struct riscv_pmu *rvpmu = to_riscv_pmu(event->pmu);
   458		struct cpu_hw_events *cpuc = this_cpu_ptr(rvpmu->hw_events);
   459	
   460		if (branch_user_callstack(event->attr.branch_sample_type) &&
   461		    event->ctx->task->perf_ctx_data)
 > 462			task_context(event->ctx->task->perf_ctx_data)->callstack_users++;
   463	
   464		perf_sched_cb_inc(event->pmu);
   465	
   466		if (!cpuc->ctr_users++)
   467			riscv_pmu_ctr_reset();
   468	}
   469	

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