Merge tag 'riscv-for-linus-6.11-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V fixes from Palmer Dabbelt:

 - Two fixes for smp_processor_id() calls in preemptible sections: one
   if the perf driver, and one in the fence.i prctl.

* tag 'riscv-for-linus-6.11-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: Disable preemption while handling PR_RISCV_CTX_SW_FENCEI_OFF
  drivers: perf: Fix smp_processor_id() use in preemptible code

Author: torvalds

arch/riscv/mm/cacheflush.c

@@ -158,6 +158,7 @@ void __init riscv_init_cbo_blocksizes(void)
 #ifdef CONFIG_SMP
 static void set_icache_stale_mask(void)
 {
+	int cpu = get_cpu();
 	cpumask_t *mask;
 	bool stale_cpu;
 
@@ -168,10 +169,11 @@ static void set_icache_stale_mask(void)
 	 * concurrently on different harts.
 	 */
 	mask = &current->mm->context.icache_stale_mask;
-	stale_cpu = cpumask_test_cpu(smp_processor_id(), mask);
+	stale_cpu = cpumask_test_cpu(cpu, mask);
 
 	cpumask_setall(mask);
-	cpumask_assign_cpu(smp_processor_id(), mask, stale_cpu);
+	cpumask_assign_cpu(cpu, mask, stale_cpu);
+	put_cpu();
 }
 #endif
 
@@ -239,14 +241,12 @@ int riscv_set_icache_flush_ctx(unsigned long ctx, unsigned long scope)
 	case PR_RISCV_CTX_SW_FENCEI_OFF:
 		switch (scope) {
 		case PR_RISCV_SCOPE_PER_PROCESS:
-			current->mm->context.force_icache_flush = false;
-
 			set_icache_stale_mask();
+			current->mm->context.force_icache_flush = false;
 			break;
 		case PR_RISCV_SCOPE_PER_THREAD:
-			current->thread.force_icache_flush = false;
-
 			set_icache_stale_mask();
+			current->thread.force_icache_flush = false;
 			break;
 		default:
 			return -EINVAL;

drivers/perf/riscv_pmu_sbi.c

@@ -1373,11 +1373,15 @@ static int pmu_sbi_device_probe(struct platform_device *pdev)
 
 	/* SBI PMU Snapsphot is only available in SBI v2.0 */
 	if (sbi_v2_available) {
+		int cpu;
+
 		ret = pmu_sbi_snapshot_alloc(pmu);
 		if (ret)
 			goto out_unregister;
 
-		ret = pmu_sbi_snapshot_setup(pmu, smp_processor_id());
+		cpu = get_cpu();
+
+		ret = pmu_sbi_snapshot_setup(pmu, cpu);
 		if (ret) {
 			/* Snapshot is an optional feature. Continue if not available */
 			pmu_sbi_snapshot_free(pmu);
@@ -1391,6 +1395,7 @@ static int pmu_sbi_device_probe(struct platform_device *pdev)
 			 */
 			static_branch_enable(&sbi_pmu_snapshot_available);
 		}
+		put_cpu();
 	}
 
 	register_sysctl("kernel", sbi_pmu_sysctl_table);