[PATCH] perf_counter: do not create perf counter mlock sysctl whenCONFIG_PERF_COUNTERS=n

[Ian Campbell]

Building tip from 82811bee3 without CONFIG_PERF_COUNTERS results in:

  CC      kernel/sysctl.o
kernel/sysctl.c:928: error: 'sysctl_perf_counter_mlock' undeclared here (not in a function)

This is due to c5078f78b "perf_counter: provide an mlock threshold"

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 44ebd90..c2a4467 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -922,6 +922,7 @@ static struct ctl_table kern_table[] = {
 		.child		= slow_work_sysctls,
 	},
 #endif
+#ifdef CONFIG_PERF_COUNTERS
 	{
 		.ctl_name	= CTL_UNNUMBERED,
 		.procname	= "perf_counter_mlock_kb",
@@ -930,6 +931,7 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
+#endif
 /*
  * NOTE: do not add new entries to this table unless you have read
  * Documentation/sysctl/ctl_unnumbered.txt


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