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kbuild: vdso_install: hide readelf warnings

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If 'readelf -n' encounters a note it does not recognize it emits a
warning. This for example happens when inspecting a compat vDSO for
which the main kernel toolchain was not used.
However the relevant build ID note is always readable, so the
warnings are pointless.

Hide the warnings to make it possible to extract build IDs for more
architectures in the future.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20260331-kbuild-vdso-install-v2-2-606d0dc6beca@weissschuh.net
Signed-off-by: Nicolas Schier <nsc@kernel.org>
This commit is contained in:
Thomas Weißschuh 2026-03-31 19:50:20 +02:00 • committed by Nicolas Schier
commit ec2137476d
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2
scripts/Makefile.vdsoinst
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@ -21,7 +21,7 @@ $$(dest): $(1) FORCE
# Some architectures create .build-id symlinks
ifneq ($(filter arm s390 sparc x86, $(SRCARCH)),)
build-id-file := $$(shell $(READELF) -n $(1) | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p')
build-id-file := $$(shell $(READELF) -n $(1) 2>/dev/null | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p')
link := $(install-dir)/.build-id/$$(build-id-file).debug
__default: $$(link)