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tracing: Adjust cmd_check_undefined to show unexpected undefined symbols

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When the check_undefined command in kernel/trace/Makefile fails, there
is no output, making it hard to understand why the build failed. Capture
the output of the $(NM) + grep command and print it when failing to make
it clearer what the problem is.

Fixes: a717943d8e ("tracing: Check for undefined symbols in simple_ring_buffer")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Vincent Donnefort <vdonnefort@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20260320-cmd_check_undefined-verbose-v1-1-54fc5b061f94@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Nathan Chancellor
2026-03-20 14:29:33 -07:00
committed by Marc Zyngier
parent d772964394
commit 58b4bd1839
1 changed files with 7 additions and 1 deletions
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8
kernel/trace/Makefile
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@@ -174,7 +174,13 @@ UNDEFINED_ALLOWLIST = __asan __gcov __kasan __kcsan __hwasan __sancov __sanitize
$(shell $(NM) -u $(obj)/undefsyms_base.o 2>/dev/null | awk '{print $$2}')
quiet_cmd_check_undefined = NM $<
cmd_check_undefined = test -z "`$(NM) -u $< | grep -v $(addprefix -e , $(UNDEFINED_ALLOWLIST))`"
cmd_check_undefined = \
undefsyms=$$($(NM) -u $< | grep -v $(addprefix -e , $(UNDEFINED_ALLOWLIST)) || true); \
if [ -n "$$undefsyms" ]; then \
echo "Unexpected symbols in $<:" >&2; \
echo "$$undefsyms" >&2; \
false; \
fi
$(obj)/%.o.checked: $(obj)/%.o $(obj)/undefsyms_base.o FORCE
$(call if_changed,check_undefined)