!65 [PATCH] Avoid unused function warning on bpf_tail_call_static

From: @zhang-mingyi66 
Reviewed-by: @bitcoffee, @nlgwcy 
Signed-off-by: @nlgwcy

backport-libbpf-Avoid-unused-function-warning-on-bpf_tail_call_static.patch

@@ -0,0 +1,30 @@
+From f15814c93ade62519c9ccb50a8ca5c8998010ac2 Mon Sep 17 00:00:00 2001
+From: Ian Rogers <irogers@google.com>
+Date: Wed, 13 Jan 2021 14:36:08 -0800
+Subject: [PATCH] bpf, libbpf: Avoid unused function warning on
+ bpf_tail_call_static
+
+Add inline to __always_inline making it match the linux/compiler.h.
+Adding this avoids an unused function warning on bpf_tail_call_static
+when compining with -Wall.
+
+Signed-off-by: Ian Rogers <irogers@google.com>
+Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
+Link: https://lore.kernel.org/bpf/20210113223609.3358812-1-irogers@google.com
+---
+ src/bpf_helpers.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/bpf_helpers.h b/src/bpf_helpers.h
+index 72b25111..ae6c975e 100644
+--- a/src/bpf_helpers.h
++++ b/src/bpf_helpers.h
+@@ -30,7 +30,7 @@
+ #define SEC(NAME) __attribute__((section(NAME), used))
+ 
+ #ifndef __always_inline
+-#define __always_inline __attribute__((always_inline))
++#define __always_inline inline __attribute__((always_inline))
+ #endif
+ #ifndef __noinline
+ #define __noinline __attribute__((noinline))

libbpf.spec

@@ -4,7 +4,7 @@
 
 Name:           %{githubname}
 Version:        %{githubver}
-Release:        3
+Release:        4
 Summary:        Libbpf library
 
 License:        LGPLv2 or BSD
@@ -17,6 +17,7 @@ Patch6001:	backport-libbpf-Ensure-functions-with-always_inline-attribute-are-inl
 Patch6002:	backport-libbpf-Fix-the-name-of-a-reused-map.patch
 Patch6003:	backport-libbpf-preserve-errno-across-pr_warn-pr_info-pr_debug.patch
 Patch6004:	backport-libbpf-Fix-determine_ptr_size-guessing.patch
+Patch6005:	backport-libbpf-Avoid-unused-function-warning-on-bpf_tail_call_static.patch
 
 # This package supersedes libbpf from kernel-tools,
 # which has default Epoch: 0. By having Epoch: 1
@@ -68,6 +69,9 @@ developing applications that use %{name}
 %{_libdir}/libbpf.a
 
 %changelog
+* Sun Jan 29 2023 zhangmingyi <zhangmingyi5@huawei.com> - 2:0.3-4
+- backporting: Avoid unused function warning on bpf_tail_call_static
+
 * Wed Jan 18 2023 zhangmingyi <zhangmingyi5@huawei.com> - 2:0.3-3
 - Fix determine_ptr_size() guessing