The next patch makes CONFIG_DEBUG_INFO_BTF a tristate. With =m, Kconfig defines CONFIG_DEBUG_INFO_BTF_MODULE instead of CONFIG_DEBUG_INFO_BTF, so every check that must hold for both =y and =m has to be written for it:
- #ifdef CONFIG_DEBUG_INFO_BTF becomes #if IS_ENABLED(...) where the generated BTF and its id tables must be the same for =y and =m: the .BTF_ids tables (btf_ids.h), the BTF type tags (compiler_types.h), and the tracepoint and syscall BTF ids (trace_events.h, trace_syscalls.c). Leaving them would silently produce empty id sets with =m. - obj-$(CONFIG_DEBUG_INFO_BTF) and include-$(CONFIG_DEBUG_INFO_BTF) become $(subst m,y,...) where the object is built into the kernel regardless: sysfs_btf.o, the netfilter and xfrm kfunc objects, and scripts/Makefile.btf. Otherwise =m would try to build them as modules (xfrm_state_bpf.o fails modpost for lack of MODULE_LICENSE) or skip the BTF generation flags. No functional change: CONFIG_DEBUG_INFO_BTF is still a bool, for which IS_ENABLED() and #ifdef agree and $(subst m,y,y) is y. Signed-off-by: Jay Wang <[email protected]> --- Makefile | 3 ++- include/linux/btf_ids.h | 2 +- include/linux/compiler_types.h | 2 +- include/trace/trace_events.h | 2 +- kernel/bpf/Makefile | 2 +- kernel/trace/trace_syscalls.c | 6 +++--- net/netfilter/Makefile | 6 +++--- net/xfrm/Makefile | 4 ++-- 8 files changed, 14 insertions(+), 13 deletions(-) diff --git a/Makefile b/Makefile index 66654fa71655..3a1b4a8fb424 100644 --- a/Makefile +++ b/Makefile @@ -1208,7 +1208,8 @@ endif # include additional Makefiles when needed include-y := scripts/Makefile.warn include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug -include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf +# CONFIG_DEBUG_INFO_BTF is a tristate; BTF is generated for both y and m +include-$(subst m,y,$(CONFIG_DEBUG_INFO_BTF)) += scripts/Makefile.btf include-$(CONFIG_KASAN) += scripts/Makefile.kasan include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h index 8b5a9ee92513..c665afff100e 100644 --- a/include/linux/btf_ids.h +++ b/include/linux/btf_ids.h @@ -22,7 +22,7 @@ struct btf_id_set8 { } pairs[]; }; -#ifdef CONFIG_DEBUG_INFO_BTF +#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF) #include <linux/compiler.h> /* for __PASTE */ #include <linux/compiler_attributes.h> /* for __maybe_unused */ diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index c5921f139007..a90a99849cee 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -34,7 +34,7 @@ * Skipped when running bindgen due to a libclang issue; * see https://github.com/rust-lang/rust-bindgen/issues/2244. */ -#if defined(CONFIG_DEBUG_INFO_BTF) && defined(CONFIG_PAHOLE_HAS_BTF_TAG) && \ +#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF) && defined(CONFIG_PAHOLE_HAS_BTF_TAG) && \ __has_attribute(btf_type_tag) && !defined(__BINDGEN__) # define BTF_TYPE_TAG(value) __attribute__((btf_type_tag(#value))) #else diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h index 93011f800d0f..2a0098929771 100644 --- a/include/trace/trace_events.h +++ b/include/trace/trace_events.h @@ -398,7 +398,7 @@ static inline notrace int trace_event_get_offsets_##call( \ #define _TRACE_PERF_INIT(call) #endif /* CONFIG_PERF_EVENTS */ -#if defined(CONFIG_BPF_EVENTS) && defined(CONFIG_DEBUG_INFO_BTF) +#if defined(CONFIG_BPF_EVENTS) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF) /* * Per-template BTF id list, populated at link time by resolve_btfids: * [0] FUNC __bpf_trace_<call> (the BPF dispatcher) diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile index 9a92c348bbda..7d745b602b80 100644 --- a/kernel/bpf/Makefile +++ b/kernel/bpf/Makefile @@ -41,7 +41,7 @@ ifeq ($(CONFIG_INET),y) obj-$(CONFIG_BPF_SYSCALL) += reuseport_array.o endif ifeq ($(CONFIG_SYSFS),y) -obj-$(CONFIG_DEBUG_INFO_BTF) += sysfs_btf.o +obj-$(subst m,y,$(CONFIG_DEBUG_INFO_BTF)) += sysfs_btf.o endif ifeq ($(CONFIG_BPF_JIT),y) obj-$(CONFIG_BPF_SYSCALL) += bpf_struct_ops.o diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index e35744049e3f..7a0d59c308c2 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -1304,7 +1304,7 @@ struct trace_event_functions exit_syscall_print_funcs = { .trace = print_syscall_exit, }; -#if defined(CONFIG_BPF_EVENTS) && defined(CONFIG_DEBUG_INFO_BTF) +#if defined(CONFIG_BPF_EVENTS) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF) /* BTF id lists for the shared sys_enter/sys_exit dispatcher tracepoints. */ BTF_ID_LIST(syscall_enter_btf_ids) BTF_ID(func, __bpf_trace_sys_enter) @@ -1321,7 +1321,7 @@ struct trace_event_class __refdata event_class_syscall_enter = { .fields_array = syscall_enter_fields_array, .get_fields = syscall_get_enter_fields, .raw_init = init_syscall_trace, -#if defined(CONFIG_BPF_EVENTS) && defined(CONFIG_DEBUG_INFO_BTF) +#if defined(CONFIG_BPF_EVENTS) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF) .btf_ids = syscall_enter_btf_ids, #endif }; @@ -1336,7 +1336,7 @@ struct trace_event_class __refdata event_class_syscall_exit = { }, .fields = LIST_HEAD_INIT(event_class_syscall_exit.fields), .raw_init = init_syscall_trace, -#if defined(CONFIG_BPF_EVENTS) && defined(CONFIG_DEBUG_INFO_BTF) +#if defined(CONFIG_BPF_EVENTS) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF) .btf_ids = syscall_exit_btf_ids, #endif }; diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index 6bf74d488a29..a2c7f00794d2 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -18,7 +18,7 @@ nf_conntrack-$(CONFIG_NF_CT_PROTO_GRE) += nf_conntrack_proto_gre.o ifeq ($(CONFIG_NF_CONNTRACK),m) nf_conntrack-$(CONFIG_DEBUG_INFO_BTF_MODULES) += nf_conntrack_bpf.o else ifeq ($(CONFIG_NF_CONNTRACK),y) -nf_conntrack-$(CONFIG_DEBUG_INFO_BTF) += nf_conntrack_bpf.o +nf_conntrack-$(subst m,y,$(CONFIG_DEBUG_INFO_BTF)) += nf_conntrack_bpf.o endif obj-$(CONFIG_NETFILTER) = netfilter.o @@ -65,7 +65,7 @@ nf_nat-$(CONFIG_NF_NAT_OVS) += nf_nat_ovs.o ifeq ($(CONFIG_NF_NAT),m) nf_nat-$(CONFIG_DEBUG_INFO_BTF_MODULES) += nf_nat_bpf.o else ifeq ($(CONFIG_NF_NAT),y) -nf_nat-$(CONFIG_DEBUG_INFO_BTF) += nf_nat_bpf.o +nf_nat-$(subst m,y,$(CONFIG_DEBUG_INFO_BTF)) += nf_nat_bpf.o endif # NAT helpers @@ -147,7 +147,7 @@ nf_flow_table-$(CONFIG_NF_FLOW_TABLE_PROCFS) += nf_flow_table_procfs.o ifeq ($(CONFIG_NF_FLOW_TABLE),m) nf_flow_table-$(CONFIG_DEBUG_INFO_BTF_MODULES) += nf_flow_table_bpf.o else ifeq ($(CONFIG_NF_FLOW_TABLE),y) -nf_flow_table-$(CONFIG_DEBUG_INFO_BTF) += nf_flow_table_bpf.o +nf_flow_table-$(subst m,y,$(CONFIG_DEBUG_INFO_BTF)) += nf_flow_table_bpf.o endif obj-$(CONFIG_NF_FLOW_TABLE_INET) += nf_flow_table_inet.o diff --git a/net/xfrm/Makefile b/net/xfrm/Makefile index 5a1787587cb3..b7f6e5046a0e 100644 --- a/net/xfrm/Makefile +++ b/net/xfrm/Makefile @@ -8,7 +8,7 @@ xfrm_interface-$(CONFIG_XFRM_INTERFACE) += xfrm_interface_core.o ifeq ($(CONFIG_XFRM_INTERFACE),m) xfrm_interface-$(CONFIG_DEBUG_INFO_BTF_MODULES) += xfrm_interface_bpf.o else ifeq ($(CONFIG_XFRM_INTERFACE),y) -xfrm_interface-$(CONFIG_DEBUG_INFO_BTF) += xfrm_interface_bpf.o +xfrm_interface-$(subst m,y,$(CONFIG_DEBUG_INFO_BTF)) += xfrm_interface_bpf.o endif obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \ @@ -23,4 +23,4 @@ obj-$(CONFIG_XFRM_IPCOMP) += xfrm_ipcomp.o obj-$(CONFIG_XFRM_INTERFACE) += xfrm_interface.o obj-$(CONFIG_XFRM_IPTFS) += xfrm_iptfs.o obj-$(CONFIG_XFRM_ESPINTCP) += espintcp.o -obj-$(CONFIG_DEBUG_INFO_BTF) += xfrm_state_bpf.o +obj-$(subst m,y,$(CONFIG_DEBUG_INFO_BTF)) += xfrm_state_bpf.o -- 2.47.3
