!60 libbpf例行补丁回合

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

backport-libbpf-Ensure-functions-with-always_inline-attribute-are-inline.patch

@@ -0,0 +1,82 @@
+From 69d537ba0b5cd736cd5081d84928f4393856d3db Mon Sep 17 00:00:00 2001
+From: James Hilliard <james.hilliard1@gmail.com>
+Date: Wed, 3 Aug 2022 09:14:03 -0600
+Subject: [PATCH] libbpf: Ensure functions with always_inline attribute are inline
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+GCC expects the always_inline attribute to only be set on inline
+functions, as such we should make all functions with this attribute
+use the __always_inline macro which makes the function inline and
+sets the attribute.
+
+Fixes errors like:
+/home/buildroot/bpf-next/tools/testing/selftests/bpf/tools/include/bpf/bpf_tracing.h:439:1: error: ‘always_inline’ function might not be inlinable [-Werror=attributes]
+  439 | ____##name(unsigned long long *ctx, ##args)
+      | ^~~~
+
+Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
+Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
+Acked-by: Jiri Olsa <jolsa@kernel.org>
+Link: https://lore.kernel.org/bpf/20220803151403.793024-1-james.hilliard1@gmail.com
+
+Conflict: remove the modify of src/usdt.bpf.h because the include file
+src/usdt.bpf.h is not exist in current version
+Reference: https://github.com/libbpf/libbpf/commit/69d537ba0b5cd736cd5081d84928f4393856d3db
+---
+ src/bpf_tracing.h | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/src/bpf_tracing.h b/src/bpf_tracing.h
+index f9ef377..12c0bb5 100644
+--- a/src/bpf_tracing.h
++++ b/src/bpf_tracing.h
+@@ -424,7 +424,7 @@ struct pt_regs;
+  */
+ #define BPF_PROG(name, args...)						    \
+ name(unsigned long long *ctx);						    \
+-static __attribute__((always_inline)) typeof(name(0))			    \
++static __always_inline typeof(name(0))					    \
+ ____##name(unsigned long long *ctx, ##args);				    \
+ typeof(name(0)) name(unsigned long long *ctx)				    \
+ {									    \
+@@ -433,7 +433,7 @@ typeof(name(0)) name(unsigned long long *ctx)				    \
+ 	return ____##name(___bpf_ctx_cast(args));			    \
+ 	_Pragma("GCC diagnostic pop")					    \
+ }									    \
+-static __attribute__((always_inline)) typeof(name(0))			    \
++static __always_inline typeof(name(0))					    \
+ ____##name(unsigned long long *ctx, ##args)
+ 
+ struct pt_regs;
+@@ -458,7 +458,7 @@ struct pt_regs;
+  */
+ #define BPF_KPROBE(name, args...)					    \
+ name(struct pt_regs *ctx);						    \
+-static __attribute__((always_inline)) typeof(name(0))			    \
++static __always_inline typeof(name(0))					    \
+ ____##name(struct pt_regs *ctx, ##args);				    \
+ typeof(name(0)) name(struct pt_regs *ctx)				    \
+ {									    \
+@@ -467,7 +467,7 @@ typeof(name(0)) name(struct pt_regs *ctx)				    \
+ 	return ____##name(___bpf_kprobe_args(args));			    \
+ 	_Pragma("GCC diagnostic pop")					    \
+ }									    \
+-static __attribute__((always_inline)) typeof(name(0))			    \
++static __always_inline typeof(name(0))					    \
+ ____##name(struct pt_regs *ctx, ##args)
+ 
+ #define ___bpf_kretprobe_args0()       ctx
+@@ -482,7 +482,7 @@ ____##name(struct pt_regs *ctx, ##args)
+  */
+ #define BPF_KRETPROBE(name, args...)					    \
+ name(struct pt_regs *ctx);						    \
+-static __attribute__((always_inline)) typeof(name(0))			    \
++static __always_inline typeof(name(0))					    \
+ ____##name(struct pt_regs *ctx, ##args);				    \
+ typeof(name(0)) name(struct pt_regs *ctx)				    \
+ {									    \
+-- 
+2.33.0
+

backport-libbpf-Fix-the-name-of-a-reused-map.patch

@@ -0,0 +1,66 @@
+From 9b6f4eb1570c219474f6029caea71584d7a2188a Mon Sep 17 00:00:00 2001
+From: Anquan Wu <leiqi96@hotmail.com>
+Date: Tue, 12 Jul 2022 11:15:40 +0800
+Subject: [PATCH] libbpf: Fix the name of a reused map
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+BPF map name is limited to BPF_OBJ_NAME_LEN.
+A map name is defined as being longer than BPF_OBJ_NAME_LEN,
+it will be truncated to BPF_OBJ_NAME_LEN when a userspace program
+calls libbpf to create the map. A pinned map also generates a path
+in the /sys. If the previous program wanted to reuse the map，
+it can not get bpf_map by name, because the name of the map is only
+partially the same as the name which get from pinned path.
+
+The syscall information below show that map name "process_pinned_map"
+is truncated to "process_pinned_".
+
+    bpf(BPF_OBJ_GET, {pathname="/sys/fs/bpf/process_pinned_map",
+    bpf_fd=0, file_flags=0}, 144) = -1 ENOENT (No such file or directory)
+
+    bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_HASH, key_size=4,
+    value_size=4,max_entries=1024, map_flags=0, inner_map_fd=0,
+    map_name="process_pinned_",map_ifindex=0, btf_fd=3, btf_key_type_id=6,
+    btf_value_type_id=10,btf_vmlinux_value_type_id=0}, 72) = 4
+
+This patch check that if the name of pinned map are the same as the
+actual name for the first (BPF_OBJ_NAME_LEN - 1),
+bpf map still uses the name which is included in bpf object.
+
+Fixes: 26736eb9a483 ("tools: libbpf: allow map reuse")
+Signed-off-by: Anquan Wu <leiqi96@hotmail.com>
+Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
+Link: https://lore.kernel.org/bpf/OSZP286MB1725CEA1C95C5CB8E7CCC53FB8869@OSZP286MB1725.JPNP286.PROD.OUTLOOK.COM
+---
+ src/libbpf.c | 9 +++++++--
+ 1 file changed, 7 insertions(+), 2 deletions(-)
+
+diff --git a/src/libbpf.c b/src/libbpf.c
+index 72548798..68da1aca 100644
+--- a/src/libbpf.c
++++ b/src/libbpf.c
+@@ -4327,7 +4327,7 @@ int bpf_map__set_autocreate(struct bpf_map *map, bool autocreate)
+ int bpf_map__reuse_fd(struct bpf_map *map, int fd)
+ {
+ 	struct bpf_map_info info = {};
+-	__u32 len = sizeof(info);
++	__u32 len = sizeof(info), name_len;
+ 	int new_fd, err;
+ 	char *new_name;
+ 
+@@ -4337,7 +4337,12 @@ int bpf_map__reuse_fd(struct bpf_map *map, int fd)
+ 	if (err)
+ 		return libbpf_err(err);
+ 
+-	new_name = strdup(info.name);
++	name_len = strlen(info.name);
++	if (name_len == BPF_OBJ_NAME_LEN - 1 && strncmp(map->name, info.name, name_len) == 0)
++		new_name = strdup(map->name);
++	else
++		new_name = strdup(info.name);
++
+ 	if (!new_name)
+ 		return libbpf_err(-errno);
+ 

backport-libbpf-preserve-errno-across-pr_warn-pr_info-pr_debug.patch

@@ -0,0 +1,52 @@
+From 45dca19bd2f3fff624f03e903be9241af7cb26c6 Mon Sep 17 00:00:00 2001
+From: Andrii Nakryiko <andrii@kernel.org>
+Date: Wed, 10 Aug 2022 11:34:25 -0700
+Subject: [PATCH] libbpf: preserve errno across pr_warn/pr_info/pr_debug
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+As suggested in [0], make sure that libbpf_print saves and restored
+errno and as such guaranteed that no matter what actual print callback
+user installs, macros like pr_warn/pr_info/pr_debug are completely
+transparent as far as errno goes.
+
+While libbpf code is pretty careful about not clobbering important errno
+values accidentally with pr_warn(), it's a trivial change to make sure
+that pr_warn can be used anywhere without a risk of clobbering errno.
+
+No functional changes, just future proofing.
+
+  [0] https://github.com/libbpf/libbpf/pull/536
+
+Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
+Acked-by: Daniel Müller <deso@posteo.net>
+Link: https://lore.kernel.org/r/20220810183425.1998735-1-andrii@kernel.org
+Signed-off-by: Alexei Starovoitov <ast@kernel.org>
+---
+ src/libbpf.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/src/libbpf.c b/src/libbpf.c
+index f7364ea8..917d975b 100644
+--- a/src/libbpf.c
++++ b/src/libbpf.c
+@@ -95,13 +95,18 @@ __printf(2, 3)
+ void libbpf_print(enum libbpf_print_level level, const char *format, ...)
+ {
+ 	va_list args;
++	int old_errno;
+ 
+ 	if (!__libbpf_pr)
+ 		return;
+ 
++	old_errno = errno;
++
+ 	va_start(args, format);
+ 	__libbpf_pr(level, format, args);
+ 	va_end(args);
++
++	errno = old_errno;
+ }
+ 
+ static void pr_perm_msg(int err)

libbpf.spec

@@ -4,7 +4,7 @@
 
 Name:           %{githubname}
 Version:        %{githubver}
-Release:        2
+Release:        3
 Summary:        Libbpf library
 
 License:        LGPLv2 or BSD
@@ -14,6 +14,9 @@ BuildRequires:  gcc elfutils-libelf-devel elfutils-devel
 
 #patches
 Patch0000:      backport-libbpf-Fix-determine_ptr_size-guessing.patch
+Patch0001:      backport-libbpf-preserve-errno-across-pr_warn-pr_info-pr_debug.patch
+Patch0002:      backport-libbpf-Ensure-functions-with-always_inline-attribute-are-inline.patch
+Patch0003:      backport-libbpf-Fix-the-name-of-a-reused-map.patch
 
 # This package supersedes libbpf from kernel-tools,
 # which has default Epoch: 0. By having Epoch: 1
@@ -66,6 +69,11 @@ developing applications that use %{name}
 %{_libdir}/libbpf.a
 
 %changelog
+* Fri Jan 6 2023 zhangmingyi<zhangmingyi5@huawei.com> - 2:0.8.1-3
+-- backporting: backport-libbpf-Ensure-functions-with-always_inline-attribute-are-inline.patch 
+                backport-libbpf-Fix-the-name-of-a-reused-map.patch
+                backport-libbpf-preserve-errno-across-pr_warn-pr_info-pr_debug.patch
+
 * Sat Nov 26 2022 zhangmingyi <zhangmingyi@huawei.com> -2:0.8.1-2
 - libbpf.spec - modify Source address