[PATCH 29/35] kasan, x86, s390: update undef CONFIG_KASAN

[Andrey Konovalov <andreyknvl@google.com>]

With the intoduction of hardware tag-based KASAN some kernel checks of
this kind:

  ifdef CONFIG_KASAN

will be updated to:

  if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)

x86 and s390 use a trick to #undef CONFIG_KASAN for some of the code
that isn't linked with KASAN runtime and shouldn't have any KASAN
annotations.

Also #undef CONFIG_KASAN_GENERIC with CONFIG_KASAN.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 arch/s390/boot/string.c         | 1 +
 arch/x86/boot/compressed/misc.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/s390/boot/string.c b/arch/s390/boot/string.c
index b11e8108773a..faccb33b462c 100644
--- a/arch/s390/boot/string.c
+++ b/arch/s390/boot/string.c
@@ -3,6 +3,7 @@
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #undef CONFIG_KASAN
+#undef CONFIG_KASAN_GENERIC
 #include "../lib/string.c"
 
 int strncmp(const char *cs, const char *ct, size_t count)
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index 726e264410ff..2ac973983a8e 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -12,6 +12,7 @@
 #undef CONFIG_PARAVIRT_XXL
 #undef CONFIG_PARAVIRT_SPINLOCKS
 #undef CONFIG_KASAN
+#undef CONFIG_KASAN_GENERIC
 
 /* cpu_feature_enabled() cannot be used this early */
 #define USE_EARLY_PGTABLE_L5
-- 
2.28.0.220.ged08abb693-goog