Merge branch 'libbpf-global-vars'

Andrii Nakryiko says:

====================
This patch set salvages all the non-extern-specific changes out of blocked
externs patch set ([0]). In addition to small clean ups, it also refactors
libbpf's handling of relocations and allows support for global (non-static)
variables.

  [0] https://patchwork.ozlabs.org/project/netdev/list/?series=143358&state=*
====================
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/Makefile

@@ -161,7 +161,7 @@ $(OUTPUT)/flow_dissector_load.o: flow_dissector_load.h
 define CLANG_BPF_BUILD_RULE
 	($(CLANG) $3 -O2 -target bpf -emit-llvm				\
 		-c $1 -o - || echo "BPF obj compilation failed") | 	\
-	$(LLC) -march=bpf -mcpu=probe $4 -filetype=obj -o $2
+	$(LLC) -mattr=dwarfris -march=bpf -mcpu=probe $4 -filetype=obj -o $2
 endef
 # Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
 define CLANG_NOALU32_BPF_BUILD_RULE

tools/testing/selftests/bpf/progs/test_core_reloc_arrays.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_arrays_output {
 	int a2;

tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_bitfields {
 	/* unsigned bitfields */

tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_probed.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_bitfields {
 	/* unsigned bitfields */

tools/testing/selftests/bpf/progs/test_core_reloc_existence.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_existence_output {
 	int a_exists;

tools/testing/selftests/bpf/progs/test_core_reloc_flavors.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_flavors {
 	int a;

tools/testing/selftests/bpf/progs/test_core_reloc_ints.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_ints {
 	uint8_t		u8_field;

tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_kernel_output {
 	int valid[10];

tools/testing/selftests/bpf/progs/test_core_reloc_misc.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_misc_output {
 	int a, b, c;

tools/testing/selftests/bpf/progs/test_core_reloc_mods.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_mods_output {
 	int a, b, c, d, e, f, g, h;

tools/testing/selftests/bpf/progs/test_core_reloc_nesting.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_nesting_substruct {
 	int a;

tools/testing/selftests/bpf/progs/test_core_reloc_primitives.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 enum core_reloc_primitives_enum {
 	A = 0,

tools/testing/selftests/bpf/progs/test_core_reloc_ptr_as_arr.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_ptr_as_arr {
 	int a;

tools/testing/selftests/bpf/progs/test_core_reloc_size.c

@@ -8,10 +8,10 @@
 
 char _license[] SEC("license") = "GPL";
 
-static volatile struct data {
+struct {
 	char in[256];
 	char out[256];
-} data;
+} data = {};
 
 struct core_reloc_size_output {
 	int int_sz;