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

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[ Upstream commit c23587c92f6e3260fe3b82bb75b38aa2553b9468 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christian Borntraeger 2019-12-18 09:34:57 +01:00 • committed by Greg Kroah-Hartman
commit 4d0f70fca0
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"