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s390/purgatory: do not build purgatory with kcov, kasan and friends 

the purgatory must not rely on functions from the "old" kernel,
so we must disable kasan and friends. We also need to have a
separate copy of string.c as the default does not build memcmp
with KASAN.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Christian Borntraeger 2019-12-18 09:34:57 +01:00 committed by Vasily Gorbik
parent cd92ac2530
commit c23587c92f
2 changed files with 7 additions and 2 deletions
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6
arch/s390/purgatory/Makefile
View File

@ -15,8 +15,10 @@ CFLAGS_sha256.o := -D__DISABLE_EXPORTS
$(obj)/mem.o: $(srctree)/arch/s390/lib/mem.S FORCE
$(call if_changed_rule,as_o_S)
$(obj)/string.o: $(srctree)/arch/s390/lib/string.c FORCE
$(call if_changed_rule,cc_o_c)
KCOV_INSTRUMENT := n
GCOV_PROFILE := n
UBSAN_SANITIZE := n
KASAN_SANITIZE := n
KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes
KBUILD_CFLAGS += -Wno-pointer-sign -Wno-sign-compare

3
arch/s390/purgatory/string.c Normal file
View File

@ -0,0 +1,3 @@
// SPDX-License-Identifier: GPL-2.0
#define __HAVE_ARCH_MEMCMP /* arch function */
#include "../lib/string.c"