From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 23 Jan 2017 17:34:07 +0000 (-0500)
Subject: Fix: 4.10 hotplug adaptation backward compat
X-Git-Tag: v2.10.0-rc1~27
X-Git-Url: http://git.lttng.org/?p=lttng-modules.git;a=commitdiff_plain;h=ce4a2f0c273d4077c6eb9e6e0f28379ddaf61382

Fix: 4.10 hotplug adaptation backward compat

                 from /home/compudj/git/lttng-modules/lttng-context-perf-counters.c:23:
/home/compudj/git/lttng-modules/lttng-context-perf-counters.c: In function ‘lttng_add_perf_counter_to_ctx’:
/home/compudj/git/lttng-modules/lttng-context-perf-counters.c:353:22: error: ‘cpu’ undeclared (first use in this function)
  for_each_online_cpu(cpu) {
                      ^
./include/linux/cpumask.h:223:8: note: in definition of macro ‘for_each_cpu’
  for ((cpu) = -1;    \
        ^
/home/compudj/git/lttng-modules/lttng-context-perf-counters.c:353:2: note: in expansion of macro ‘for_each_online_cpu’
  for_each_online_cpu(cpu) {
  ^
/home/compudj/git/lttng-modules/lttng-context-perf-counters.c:353:22: note: each undeclared identifier is reported only once for each function it appears in
  for_each_online_cpu(cpu) {
                      ^
./include/linux/cpumask.h:223:8: note: in definition of macro ‘for_each_cpu’
  for ((cpu) = -1;    \
        ^
/home/compudj/git/lttng-modules/lttng-context-perf-counters.c:353:2: note: in expansion of macro ‘for_each_online_cpu’
  for_each_online_cpu(cpu) {
  ^
./include/linux/cpumask.h:224:38: warning: left-hand operand of comma expression has no effect [-Wunused-value]
   (cpu) = cpumask_next((cpu), (mask)), \
                                      ^
./include/linux/cpumask.h:717:36: note: in expansion of macro ‘for_each_cpu’
 #define for_each_online_cpu(cpu)   for_each_cpu((cpu), cpu_online_mask)
                                    ^
/home/compudj/git/lttng-modules/lttng-context-perf-counters.c:353:2: note: in expansion of macro ‘for_each_online_cpu’
  for_each_online_cpu(cpu) {
  ^
scripts/Makefile.build:289: recipe for target '/home/compudj/git/lttng-modules/lttng-context-perf-counters.o' failed
make[2]: *** [/home/compudj/git/lttng-modules/lttng-context-perf-counters.o] Error 1
make[2]: *** Waiting for unfinished jobs....

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/lttng-context-perf-counters.c b/lttng-context-perf-counters.c
index 843cda6e..8afc11f8 100644
--- a/lttng-context-perf-counters.c
+++ b/lttng-context-perf-counters.c
@@ -350,14 +350,18 @@ cpuhp_prepare_error:
 #else	/* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
 counter_busy:
 counter_error:
-	for_each_online_cpu(cpu) {
-		if (events[cpu] && !IS_ERR(events[cpu]))
-			perf_event_release_kernel(events[cpu]);
-	}
-	put_online_cpus();
+	{
+		int cpu;
+
+		for_each_online_cpu(cpu) {
+			if (events[cpu] && !IS_ERR(events[cpu]))
+				perf_event_release_kernel(events[cpu]);
+		}
+		put_online_cpus();
 #ifdef CONFIG_HOTPLUG_CPU
-	unregister_cpu_notifier(&perf_field->nb);
+		unregister_cpu_notifier(&perf_field->nb);
 #endif
+	}
 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
 find_error:
 	lttng_remove_context_field(ctx, field);