[RFC v1 09/10] book3s64/radix: Refactoring common kfence related functions

[Ritesh Harjani (IBM)]

Both radix and hash on book3s requires to detect if kfence
early init is enabled or not. Hash needs to disable kfence
if early init is not enabled because with kfence the linear map is
mapped using PAGE_SIZE rather than 16M mapping.
We don't support multiple page sizes for slb entry used for kernel
linear map in book3s64.

This patch refactors out the common functions required to detect kfence
early init is enabled or not.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list at gmail.com>
---
 arch/powerpc/include/asm/kfence.h        |  2 ++
 arch/powerpc/mm/book3s64/radix_pgtable.c | 12 ------------
 arch/powerpc/mm/init-common.c            | 12 ++++++++++++
 3 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/include/asm/kfence.h b/arch/powerpc/include/asm/kfence.h
index fab124ada1c7..5975688d8de1 100644
--- a/arch/powerpc/include/asm/kfence.h
+++ b/arch/powerpc/include/asm/kfence.h
@@ -15,6 +15,8 @@
 #define ARCH_FUNC_PREFIX "."
 #endif
 
+extern bool kfence_early_init;
+
 #ifdef CONFIG_KFENCE
 extern bool kfence_disabled;
 
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index b0d927009af8..311e2112d782 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -363,18 +363,6 @@ static int __meminit create_physical_mapping(unsigned long start,
 }
 
 #ifdef CONFIG_KFENCE
-static bool __ro_after_init kfence_early_init = !!CONFIG_KFENCE_SAMPLE_INTERVAL;
-
-static int __init parse_kfence_early_init(char *arg)
-{
-	int val;
-
-	if (get_option(&arg, &val))
-		kfence_early_init = !!val;
-	return 0;
-}
-early_param("kfence.sample_interval", parse_kfence_early_init);
-
 static inline phys_addr_t alloc_kfence_pool(void)
 {
 	phys_addr_t kfence_pool;
diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c
index 21131b96d209..259821a4db62 100644
--- a/arch/powerpc/mm/init-common.c
+++ b/arch/powerpc/mm/init-common.c
@@ -33,6 +33,18 @@ bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP);
 bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP);
 #ifdef CONFIG_KFENCE
 bool __ro_after_init kfence_disabled;
+bool __ro_after_init kfence_early_init = !!CONFIG_KFENCE_SAMPLE_INTERVAL;
+static int __init parse_kfence_early_init(char *arg)
+{
+	int val;
+
+	if (get_option(&arg, &val))
+		kfence_early_init = !!val;
+	return 0;
+}
+early_param("kfence.sample_interval", parse_kfence_early_init);
+#else
+bool __ro_after_init kfence_early_init;
 #endif
 
 static int __init parse_nosmep(char *p)
-- 
2.45.2