[tip:x86/urgent] x86/boot: Use CROSS_COMPILE prefix for readelf

[tip-bot for Rob Landley]

Commit-ID:  3780578761921f094179c6289072a74b2228c602
Gitweb:     http://git.kernel.org/tip/3780578761921f094179c6289072a74b2228c602
Author:     Rob Landley <rob@xxxxxxxxxxx>
AuthorDate: Sat, 20 May 2017 15:03:29 -0500
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sun, 21 May 2017 13:04:27 +0200

x86/boot: Use CROSS_COMPILE prefix for readelf

The boot code Makefile contains a straight 'readelf' invocation. This
causes build warnings in cross compile environments, when there is no
unprefixed readelf accessible via $PATH.

Add the missing $(CROSS_COMPILE) prefix.

[ tglx: Rewrote changelog ]

Fixes: 98f78525371b ("x86/boot: Refuse to build with data relocations")
Signed-off-by: Rob Landley <rob@xxxxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Jiri Kosina <jkosina@xxxxxxx>
Cc: Paul Bolle <pebolle@xxxxxxxxxx>
Cc: "H.J. Lu" <hjl.tools@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/ced18878-693a-9576-a024-113ef39a22c0@xxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 arch/x86/boot/compressed/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 44163e8..2c860ad 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -94,7 +94,7 @@ vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
 quiet_cmd_check_data_rel = DATAREL $@
 define cmd_check_data_rel
 	for obj in $(filter %.o,$^); do \
-		readelf -S $$obj | grep -qF .rel.local && { \
+		${CROSS_COMPILE}readelf -S $$obj | grep -qF .rel.local && { \
 			echo "error: $$obj has data relocations!" >&2; \
 			exit 1; \
 		} || true; \