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authorVasily Gorbik <gor@linux.ibm.com>2018-05-03 17:40:13 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-05-09 11:55:01 +0300
commit0391fcb5e1f8f10d4cf491ec2ea107a2e6a937f7 (patch)
tree91915a3b8b42f466fe565991387e589376e37e33 /arch/s390
parent971a9ca6259752c04da09535707d08ccc5d1ed4b (diff)
downloadlinux-0391fcb5e1f8f10d4cf491ec2ea107a2e6a937f7.tar.xz
s390: introduce compile time check for empty .bss section
Introduce compile time check for files which should avoid using .bss section, because of the following reasons: - .bss section has not been zeroed yet, - initrd has not been moved to a safe location and could be overlapping with .bss section. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kernel/Makefile3
-rw-r--r--arch/s390/lib/Makefile3
-rw-r--r--arch/s390/scripts/Makefile.chkbss14
3 files changed, 20 insertions, 0 deletions
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index b5146697ab50..2fed39b26b42 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -98,3 +98,6 @@ obj-$(CONFIG_TRACEPOINTS) += trace.o
# vdso
obj-y += vdso64/
obj-$(CONFIG_COMPAT) += vdso32/
+
+chkbss := head.o head64.o als.o early_nobss.o
+include $(srctree)/arch/s390/scripts/Makefile.chkbss
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
index 9bfe0802684b..57ab40188d4b 100644
--- a/arch/s390/lib/Makefile
+++ b/arch/s390/lib/Makefile
@@ -8,3 +8,6 @@ obj-y += mem.o xor.o
lib-$(CONFIG_SMP) += spinlock.o
lib-$(CONFIG_KPROBES) += probes.o
lib-$(CONFIG_UPROBES) += probes.o
+
+chkbss := mem.o
+include $(srctree)/arch/s390/scripts/Makefile.chkbss
diff --git a/arch/s390/scripts/Makefile.chkbss b/arch/s390/scripts/Makefile.chkbss
new file mode 100644
index 000000000000..d92f2d94a5d9
--- /dev/null
+++ b/arch/s390/scripts/Makefile.chkbss
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+
+quiet_cmd_chkbss = CHKBSS $<
+define cmd_chkbss
+ if ! $(OBJDUMP) -j .bss -w -h $< | awk 'END { if ($$3) exit 1 }'; then \
+ echo "error: $< .bss section is not empty" >&2; exit 1; \
+ fi; \
+ touch $@;
+endef
+
+$(obj)/built-in.a: $(patsubst %, $(obj)/%.chkbss, $(chkbss))
+
+%.o.chkbss: %.o
+ $(call cmd,chkbss)