sched/isolation: Consolidate error handling

Centralize the mask freeing and return value for the error path. This
makes potential leaks more visible.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
Reviewed-by: Phil Auld <pauld@redhat.com>
Link: https://lore.kernel.org/r/20220207155910.527133-7-frederic@kernel.org

kernel/sched/isolation.c

@@ -92,12 +92,12 @@ void __init housekeeping_init(void)
 static int __init housekeeping_setup(char *str, enum hk_flags flags)
 {
 	cpumask_var_t non_housekeeping_mask, housekeeping_staging;
+	int err = 0;
 
 	alloc_bootmem_cpumask_var(&non_housekeeping_mask);
 	if (cpulist_parse(str, non_housekeeping_mask) < 0) {
 		pr_warn("Housekeeping: nohz_full= or isolcpus= incorrect CPU range\n");
-		free_bootmem_cpumask_var(non_housekeeping_mask);
-		return 0;
+		goto free_non_housekeeping_mask;
 	}
 
 	alloc_bootmem_cpumask_var(&housekeeping_staging);
@@ -119,30 +119,29 @@ static int __init housekeeping_setup(char *str, enum hk_flags flags)
 	} else {
 		if (!cpumask_equal(housekeeping_staging, housekeeping_mask)) {
 			pr_warn("Housekeeping: nohz_full= must match isolcpus=\n");
-			free_bootmem_cpumask_var(housekeeping_staging);
-			free_bootmem_cpumask_var(non_housekeeping_mask);
-			return 0;
+			goto free_housekeeping_staging;
 		}
 	}
 
-	free_bootmem_cpumask_var(housekeeping_staging);
-
 	if ((flags & HK_FLAG_TICK) && !(housekeeping_flags & HK_FLAG_TICK)) {
 		if (IS_ENABLED(CONFIG_NO_HZ_FULL)) {
 			tick_nohz_full_setup(non_housekeeping_mask);
 		} else {
 			pr_warn("Housekeeping: nohz unsupported."
 				" Build with CONFIG_NO_HZ_FULL\n");
-			free_bootmem_cpumask_var(non_housekeeping_mask);
-			return 0;
+			goto free_housekeeping_staging;
 		}
 	}
 
 	housekeeping_flags |= flags;
+	err = 1;
 
+free_housekeeping_staging:
+	free_bootmem_cpumask_var(housekeeping_staging);
+free_non_housekeeping_mask:
 	free_bootmem_cpumask_var(non_housekeeping_mask);
 
-	return 1;
+	return err;
 }
 
 static int __init housekeeping_nohz_full_setup(char *str)