kbuild: vdso_install: gracefully handle images without build ID

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>

diff --git a/scripts/Makefile.vdsoinst b/scripts/Makefile.vdsoinst
index aed153b3120b3f94ed5c5a1a3123ba5a0c27eb43..3de70218b8d487841347f8b3a555cb4e5393a5c4 100644 (file)
--- a/scripts/Makefile.vdsoinst
+++ b/scripts/Makefile.vdsoinst
@@ -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