EFI: don't repeatedly replace symlinks

Once created there's no point re-creating them on every incremental
make. This in particular prevents them from becoming root-owned during
e.g. "sudo make install-xen", but it also allows (during development)
to replace them there (instead of in common/efi/) by actual files with
perhaps slightly changed contents.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

diff --git a/xen/Makefile b/xen/Makefile
index e131cf4b71505932f6b7ece5995c2e0bc81c9373..7c77c304063d39f05a500c654e1381784000d388 100644 (file)
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -137,7 +137,9 @@ $(TARGET): delete-unfresh-files
        $(MAKE) -f $(BASEDIR)/Rules.mk include/xen/compile.h
        [ -e include/asm ] || ln -sf asm-$(TARGET_ARCH) include/asm
        [ -e arch/$(TARGET_ARCH)/efi ] && for f in boot.c runtime.c compat.c efi.h;\
-               do ln -nsf ../../../common/efi/$$f arch/$(TARGET_ARCH)/efi/; done;\
+               do test -r arch/$(TARGET_ARCH)/efi/$$f || \
+                  ln -nsf ../../../common/efi/$$f arch/$(TARGET_ARCH)/efi/; \
+               done; \
                true
        $(MAKE) -f $(BASEDIR)/Rules.mk -C include
        $(MAKE) -f $(BASEDIR)/Rules.mk -C arch/$(TARGET_ARCH) asm-offsets.s