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kbuild: vdso_install: gracefully handle images without build ID

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If the vDSO does not contain a build ID, skip the symlink step.
This will allow the removal of the explicit list of architectures.

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-v2-3-606d0dc6beca@weissschuh.net
Signed-off-by: Nicolas Schier <nsc@kernel.org>
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Thomas Weißschuh 2026-03-31 19:50:21 +02:00 • committed by Nicolas Schier
commit e4fb234235
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scripts/Makefile.vdsoinst
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@ -22,12 +22,15 @@ $$(dest): $(1) FORCE
# Some architectures create .build-id symlinks
ifneq ($(filter arm s390 sparc x86, $(SRCARCH)),)
build-id-file := $$(shell $(READELF) -n $(1) 2>/dev/null | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p')
ifneq ($$(build-id-file),)
link := $(install-dir)/.build-id/$$(build-id-file).debug
__default: $$(link)
$$(link): $$(dest) FORCE
$$(call cmd,symlink)
endif
endif
endef