arm: kasan: Use memblock_alloc_try_nid_raw for shadow page allocation

Commit Message

Mark-PK Tsai (蔡沛剛) July 31, 2023, 12:05 p.m. UTC

kasan_pte_populate fill KASAN_SHADOW_INIT in the newly
allocated shadow page, so it's unnecessary to
use memblock_alloc_try_nid, which always zero the
new allocated memory.

Use memblock_alloc_try_nid_raw instead of
memblock_alloc_try_nid like arm64 does which
can make kasan init faster.

Signed-off-by: Mark-PK Tsai <[e-mail]>
---
 arch/arm/mm/kasan_init.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Patch

diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index 24d71b5db62d..111d4f703136 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -28,6 +28,12 @@  static pgd_t tmp_pgd_table[PTRS_PER_PGD] __initdata __aligned(PGD_SIZE);
 
 pmd_t tmp_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
 
+static __init void *kasan_alloc_block_raw(size_t size)
+{
+	return memblock_alloc_try_nid_raw(size, size, __pa(MAX_DMA_ADDRESS),
+				      MEMBLOCK_ALLOC_NOLEAKTRACE, NUMA_NO_NODE);
+}
+
 static __init void *kasan_alloc_block(size_t size)
 {
 	return memblock_alloc_try_nid(size, size, __pa(MAX_DMA_ADDRESS),
@@ -50,7 +56,7 @@  static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr,
 			if (!pte_none(READ_ONCE(*ptep)))
 				continue;
 
-			p = kasan_alloc_block(PAGE_SIZE);
+			p = kasan_alloc_block_raw(PAGE_SIZE);
 			if (!p) {
 				panic("%s failed to allocate shadow page for address 0x%lx\n",
 				      __func__, addr);