[PATCH] libbpf: Fix is_pow_of_2

[Ian Rogers]

From: Yuze Chi <chiyuze@xxxxxxxxxx>

There is a missing not. Consider a power of 2 number like 4096:

x && (x & (x - 1))
4096 && (4096 & (4096 - 1))
4096 && (4096 & 4095)
4096 && 0
0

with the not this is:
x && !(x & (x - 1))
4096 && !(4096 & (4096 - 1))
4096 && !(4096 & 4095)
4096 && !0
4096 && 1
1

Reported-by: Yuze Chi <chiyuze@xxxxxxxxxx>
Signed-off-by: Yuze Chi <chiyuze@xxxxxxxxxx>
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/lib/bpf/libbpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 3f4f18684bd3..fd0414ea00df 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4956,7 +4956,7 @@ static void bpf_map__destroy(struct bpf_map *map);
 
 static bool is_pow_of_2(size_t x)
 {
-	return x && (x & (x - 1));
+	return x && !(x & (x - 1));
 }
 
 static size_t adjust_ringbuf_sz(size_t sz)
-- 
2.36.1.255.ge46751e96f-goog