linux-kernel - [PATCH v2] libbpf: Fix is_pow_of

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Date:   Thu,  2 Jun 2022 22:51:56 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yuze Chi <chiyuze@...gle.com>, Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2] libbpf: Fix is_pow_of_2

From: Yuze Chi <chiyuze@...gle.com>

Move the correct definition from linker.c into libbpf_internal.h.

Reported-by: Yuze Chi <chiyuze@...gle.com>
Signed-off-by: Yuze Chi <chiyuze@...gle.com>
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/lib/bpf/libbpf.c          | 5 -----
 tools/lib/bpf/libbpf_internal.h | 5 +++++
 tools/lib/bpf/linker.c          | 5 -----
 3 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 3f4f18684bd3..346f941bb995 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4954,11 +4954,6 @@ bpf_object__populate_internal_map(struct bpf_object *obj, struct bpf_map *map)
 
 static void bpf_map__destroy(struct bpf_map *map);
 
-static bool is_pow_of_2(size_t x)
-{
-	return x && (x & (x - 1));
-}
-
 static size_t adjust_ringbuf_sz(size_t sz)
 {
 	__u32 page_sz = sysconf(_SC_PAGE_SIZE);
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
index 4abdbe2fea9d..ef5d975078e5 100644
--- a/tools/lib/bpf/libbpf_internal.h
+++ b/tools/lib/bpf/libbpf_internal.h
@@ -580,4 +580,9 @@ struct bpf_link * usdt_manager_attach_usdt(struct usdt_manager *man,
 					   const char *usdt_provider, const char *usdt_name,
 					   __u64 usdt_cookie);
 
+static inline bool is_pow_of_2(size_t x)
+{
+	return x && (x & (x - 1)) == 0;
+}
+
 #endif /* __LIBBPF_LIBBPF_INTERNAL_H */
diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c
index 9aa016fb55aa..85c0fddf55d1 100644
--- a/tools/lib/bpf/linker.c
+++ b/tools/lib/bpf/linker.c
@@ -697,11 +697,6 @@ static int linker_load_obj_file(struct bpf_linker *linker, const char *filename,
 	return err;
 }
 
-static bool is_pow_of_2(size_t x)
-{
-	return x && (x & (x - 1)) == 0;
-}
-
 static int linker_sanity_check_elf(struct src_obj *obj)
 {
 	struct src_sec *sec;
-- 
2.36.1.255.ge46751e96f-goog