perf/hw_breakpoint: use ERR_PTR_PCPU(), IS_ERR_PCPU() and PTR_ERR_PCPU() macros

Use ERR_PTR_PCPU() when returning error pointer in the percpu address
space.  Use IS_ERR_PCPU() and PTR_ERR_PCPU() when returning the error
pointer from the percpu address space.  These macros add intermediate cast
to unsigned long when switching named address spaces.

The patch will avoid future build errors due to pointer address space
mismatch with enabled strict percpu address space checks.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Uros Bizjak <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: "Liang, Kan" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: ubizjak

kernel/events/hw_breakpoint.c

@@ -849,7 +849,7 @@ register_wide_hw_breakpoint(struct perf_event_attr *attr,
 
 	cpu_events = alloc_percpu(typeof(*cpu_events));
 	if (!cpu_events)
-		return (void __percpu __force *)ERR_PTR(-ENOMEM);
+		return ERR_PTR_PCPU(-ENOMEM);
 
 	cpus_read_lock();
 	for_each_online_cpu(cpu) {
@@ -868,7 +868,7 @@ register_wide_hw_breakpoint(struct perf_event_attr *attr,
 		return cpu_events;
 
 	unregister_wide_hw_breakpoint(cpu_events);
-	return (void __percpu __force *)ERR_PTR(err);
+	return ERR_PTR_PCPU(err);
 }
 EXPORT_SYMBOL_GPL(register_wide_hw_breakpoint);
 

samples/hw_breakpoint/data_breakpoint.c

@@ -52,8 +52,8 @@ static int __init hw_break_module_init(void)
 	attr.bp_type = HW_BREAKPOINT_W;
 
 	sample_hbp = register_wide_hw_breakpoint(&attr, sample_hbp_handler, NULL);
-	if (IS_ERR((void __force *)sample_hbp)) {
-		ret = PTR_ERR((void __force *)sample_hbp);
+	if (IS_ERR_PCPU(sample_hbp)) {
+		ret = PTR_ERR_PCPU(sample_hbp);
 		goto fail;
 	}