Put page_counter_calculate_protection() under CONFIG_MEMCG.
The protection functionality (min/low limits) is not supported by any
other cgroup subsystem, so page_counter_calculate_protection() and
related static effective_protection() can be compiled out if
CONFIG_MEMCG is not enabled.
Signed-off-by: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Acked-by: Shakeel Butt <shakeel.butt@xxxxxxxxx>
---
include/linux/page_counter.h | 6 ++++++
mm/page_counter.c | 2 ++
2 files changed, 8 insertions(+)
diff --git a/include/linux/page_counter.h b/include/linux/page_counter.h
index aadd42f5ab7b..cf837d0f8ed1 100644
--- a/include/linux/page_counter.h
+++ b/include/linux/page_counter.h
@@ -95,8 +95,14 @@ static inline void page_counter_reset_watermark(struct page_counter *counter)
counter->watermark = usage;
}
+#ifdef CONFIG_MEMCG
void page_counter_calculate_protection(struct page_counter *root,
struct page_counter *counter,
bool recursive_protection);
+#else
+static inline void page_counter_calculate_protection(struct page_counter *root,
+ struct page_counter *counter,
+ bool recursive_protection) {}
+#endif
#endif /* _LINUX_PAGE_COUNTER_H */
diff --git a/mm/page_counter.c b/mm/page_counter.c
index a54382a58ace..b249d15af9dd 100644
--- a/mm/page_counter.c
+++ b/mm/page_counter.c
@@ -288,6 +288,7 @@ int page_counter_memparse(const char *buf, const char *max,
}
+#ifdef CONFIG_MEMCG
/*
* This function calculates an individual page counter's effective
* protection which is derived from its own memory.min/low, its
@@ -459,3 +460,4 @@ void page_counter_calculate_protection(struct page_counter *root,
atomic_long_read(&parent->children_low_usage),
recursive_protection));
}
+#endif /* CONFIG_MEMCG */
--
2.46.0.rc1.232.g9752f9e123-goog
