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Subject[PATCH AUTOSEL 5.4 343/350] tools, bpf: Fix build for 'make -s tools/bpf O=<dir>'
From: Quentin Monnet <>

[ Upstream commit a89b2cbf71d64b61e79bbe5cb7ff4664797eeaaf ]

Building selftests with 'make TARGETS=bpf kselftest' was fixed in commit
55d554f5d140 ("tools: bpf: Use !building_out_of_srctree to determine
srctree"). However, by updating $(srctree) in tools/bpf/Makefile for
in-tree builds only, we leave out the case where we pass an output
directory to build BPF tools, but $(srctree) is not set. This
typically happens for:

$ make -s tools/bpf O=/tmp/foo
Makefile:40: /tools/build/Makefile.feature: No such file or directory

Fix it by updating $(srctree) in the Makefile not only for out-of-tree
builds, but also if $(srctree) is empty.

Detected with

Fixes: 55d554f5d140 ("tools: bpf: Use !building_out_of_srctree to determine srctree")
Signed-off-by: Quentin Monnet <>
Signed-off-by: Daniel Borkmann <>
Acked-by: Jakub Kicinski <>
Signed-off-by: Sasha Levin <>
tools/bpf/Makefile | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/tools/bpf/Makefile b/tools/bpf/Makefile
index 5d1995fd369c6..5535650800ab2 100644
--- a/tools/bpf/Makefile
+++ b/tools/bpf/Makefile
@@ -16,7 +16,13 @@ CFLAGS += -D__EXPORTED_HEADERS__ -I$(srctree)/include/uapi -I$(srctree)/include
# isn't set and when invoked from selftests build, where srctree
# is set to ".". building_out_of_srctree is undefined for in srctree
# builds
+ifeq ($(srctree),)
+update_srctree := 1
ifndef building_out_of_srctree
+update_srctree := 1
+ifeq ($(update_srctree),1)
srctree := $(patsubst %/,%,$(dir $(CURDIR)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
 \ /
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