[PATCH RFC 6/8] kasan, arm64: move initialization message

[Andrey Konovalov]

Tag-based KASAN modes are initialized with kasan_init_tags() instead of
kasan_init() for the generic mode. Move the initialization message for
tag-based modes into kasan_init_tags().

Also fix pr_fmt() usage for KASAN code: generic mode doesn't need it,
tag-based modes should use "kasan:" instead of KBUILD_MODNAME.

Signed-off-by: Andrey Konovalov <andreyknvl at google.com>
Link: https://linux-review.googlesource.com/id/Idfd1e50625ffdf42dfc3dbf7455b11bd200a0a49
---
 arch/arm64/mm/kasan_init.c | 3 +++
 mm/kasan/generic.c         | 2 --
 mm/kasan/hw_tags.c         | 4 ++++
 mm/kasan/sw_tags.c         | 4 +++-
 4 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index b6b9d55bb72e..8f17fa834b62 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -290,5 +290,8 @@ void __init kasan_init(void)
 {
 	kasan_init_shadow();
 	kasan_init_depth();
+#if defined(CONFIG_KASAN_GENERIC)
+	/* CONFIG_KASAN_SW/HW_TAGS also requires kasan_init_tags(). */
 	pr_info("KernelAddressSanitizer initialized\n");
+#endif
 }
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index de6b3f03a023..d259e4c3aefd 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -9,8 +9,6 @@
  *        Andrey Konovalov <andreyknvl at gmail.com>
  */
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
 #include <linux/export.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
index 0128062320d5..b372421258c8 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c
@@ -6,6 +6,8 @@
  * Author: Andrey Konovalov <andreyknvl at google.com>
  */
 
+#define pr_fmt(fmt) "kasan: " fmt
+
 #include <linux/kasan.h>
 #include <linux/kernel.h>
 #include <linux/memory.h>
@@ -18,6 +20,8 @@
 void __init kasan_init_tags(void)
 {
 	init_tags(KASAN_TAG_MAX);
+
+	pr_info("KernelAddressSanitizer initialized\n");
 }
 
 void *kasan_reset_tag(const void *addr)
diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c
index bf1422282bb5..099af6dc8f7e 100644
--- a/mm/kasan/sw_tags.c
+++ b/mm/kasan/sw_tags.c
@@ -6,7 +6,7 @@
  * Author: Andrey Konovalov <andreyknvl at google.com>
  */
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#define pr_fmt(fmt) "kasan: " fmt
 
 #include <linux/export.h>
 #include <linux/interrupt.h>
@@ -41,6 +41,8 @@ void __init kasan_init_tags(void)
 
 	for_each_possible_cpu(cpu)
 		per_cpu(prng_state, cpu) = (u32)get_cycles();
+
+	pr_info("KernelAddressSanitizer initialized\n");
 }
 
 /*
-- 
2.28.0.1011.ga647a8990f-goog