[PATCH v3 08/13] powerpc/mm/book3s64: Move kfence and debug_pagealloc related calls to __init section

Kees Cook
2025-07-17T23:25:20Z

From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>

Move a few kfence and debug_pagealloc related functions in hash_utils.c
and radix_pgtable.c to __init sections since these are only invoked once
by an __init function during system initialization.

i.e.
- hash_debug_pagealloc_alloc_slots()
- hash_kfence_alloc_pool()
- hash_kfence_map_pool()
The above 3 functions only gets called by __init htab_initialize().

- alloc_kfence_pool()
- map_kfence_pool()
The above 2 functions only gets called by __init radix_init_pgtable()

This should also help fix warning msgs like:

>> WARNING: modpost: vmlinux: section mismatch in reference:
hash_debug_pagealloc_alloc_slots+0xb0 (section: .text) ->
memblock_alloc_try_nid (section: .init.text)

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202504190552.mnFGs5sj-lkp@intel.com/
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Kees Cook <kees@kernel.org>
---
arch/powerpc/mm/book3s64/hash_utils.c | 6 +++---
arch/powerpc/mm/book3s64/radix_pgtable.c | 4 ++--
2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index 5158aefe4873..4693c464fc5a 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -343,7 +343,7 @@ static inline bool hash_supports_debug_pagealloc(void)
static u8 *linear_map_hash_slots;
static unsigned long linear_map_hash_count;
static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);
-static void hash_debug_pagealloc_alloc_slots(void)
+static __init void hash_debug_pagealloc_alloc_slots(void)
{
if (!hash_supports_debug_pagealloc())
return;
@@ -409,7 +409,7 @@ static DEFINE_RAW_SPINLOCK(linear_map_kf_hash_lock);

static phys_addr_t kfence_pool;

-static inline void hash_kfence_alloc_pool(void)
+static __init void hash_kfence_alloc_pool(void)
{
if (!kfence_early_init_enabled())
goto err;
@@ -445,7 +445,7 @@ static inline void hash_kfence_alloc_pool(void)
disable_kfence();
}

-static inline void hash_kfence_map_pool(void)
+static __init void hash_kfence_map_pool(void)
{
unsigned long kfence_pool_start, kfence_pool_end;
unsigned long prot = pgprot_val(PAGE_KERNEL);
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 9f908b1a52db..be523e5fe9c5 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -363,7 +363,7 @@ static int __meminit create_physical_mapping(unsigned long start,
}

#ifdef CONFIG_KFENCE
-static inline phys_addr_t alloc_kfence_pool(void)
+static __init phys_addr_t alloc_kfence_pool(void)
{
phys_addr_t kfence_pool;

@@ -393,7 +393,7 @@ static inline phys_addr_t alloc_kfence_pool(void)
return 0;
}

-static inline void map_kfence_pool(phys_addr_t kfence_pool)
+static __init void map_kfence_pool(phys_addr_t kfence_pool)
{
if (!kfence_pool)
return;
--
2.34.1