Hi all,

Today's linux-next merge of the bpf-next tree got a conflict in:

  tools/lib/bpf/Makefile

between commit:

  1bd63524593b ("libbpf: handle symbol versioning properly for libbpf.a")

from the bpf tree and commit:

  e01a75c15969 ("libbpf: Move bpf_{helpers, helper_defs, endian, tracing}.h into libbpf")

from the bpf-next tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc tools/lib/bpf/Makefile
index 56ce6292071b,1270955e4845..000000000000
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@@ -143,7 -133,9 +143,9 @@@ LIB_TARGET	:= $(addprefix $(OUTPUT),$(L
  LIB_FILE	:= $(addprefix $(OUTPUT),$(LIB_FILE))
  PC_FILE		:= $(addprefix $(OUTPUT),$(PC_FILE))
  
+ TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
+ 
 -GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \
 +GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
  			   cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
  			   awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$8}' | \
  			   sort -u | wc -l)
@@@ -165,7 -157,7 +167,7 @@@ all: fixde
  
  all_cmd: $(CMD_TARGETS) check
  
- $(BPF_IN_SHARED): force elfdep bpfdep
 -$(BPF_IN): force elfdep bpfdep bpf_helper_defs.h
++$(BPF_IN_SHARED): force elfdep bpfdep bpf_helper_defs.h
  	@(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
  	(diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
  	echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
@@@ -181,14 -173,15 +183,18 @@@
  	@(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
  	(diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
  	echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true
 -	$(Q)$(MAKE) $(build)=libbpf
 +	$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
 +
 +$(BPF_IN_STATIC): force elfdep bpfdep
 +	$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
  
+ bpf_helper_defs.h: $(srctree)/include/uapi/linux/bpf.h
+ 	$(Q)$(srctree)/scripts/bpf_helpers_doc.py --header 		\
+ 		--file $(srctree)/include/uapi/linux/bpf.h > bpf_helper_defs.h
+ 
  $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
  
 -$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
 +$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED)
  	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
  				    -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
  	@ln -sf $(@F) $(OUTPUT)libbpf.so
@@@ -268,9 -266,9 +279,10 @@@ config-clean
  	$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
  
  clean:
 -	$(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
 +	$(call QUIET_CLEAN, libbpf) $(RM) -rf $(TARGETS) $(CXX_TEST_TARGET) \
  		*.o *~ *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) .*.d .*.cmd \
- 		*.pc LIBBPF-CFLAGS $(SHARED_OBJDIR) $(STATIC_OBJDIR)
 -		*.pc LIBBPF-CFLAGS bpf_helper_defs.h
++		*.pc LIBBPF-CFLAGS $(SHARED_OBJDIR) $(STATIC_OBJDIR) \
++		bpf_helper_defs.h
  	$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf