arm64: Track no early_pgtable_alloc() for kmemleak

After switched page size from 64KB to 4KB on several arm64 servers here,
kmemleak starts to run out of early memory pool due to a huge number of
those early_pgtable_alloc() calls:

  kmemleak_alloc_phys()
  memblock_alloc_range_nid()
  memblock_phys_alloc_range()
  early_pgtable_alloc()
  init_pmd()
  alloc_init_pud()
  __create_pgd_mapping()
  __map_memblock()
  paging_init()
  setup_arch()
  start_kernel()

Increased the default value of DEBUG_KMEMLEAK_MEM_POOL_SIZE by 4 times
won't be enough for a server with 200GB+ memory. There isn't much
interesting to check memory leaks for those early page tables and those
early memory mappings should not reference to other memory. Hence, no
kmemleak false positives, and we can safely skip tracking those early
allocations from kmemleak like we did in the commit fed84c785270
("mm/memblock.c: skip kmemleak for kasan_init()") without needing to
introduce complications to automatically scale the value depends on the
runtime memory size etc. After the patch, the default value of
DEBUG_KMEMLEAK_MEM_POOL_SIZE becomes sufficient again.

Signed-off-by: Qian Cai <quic_qiancai@quicinc.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Link: https://lore.kernel.org/r/20211105150509.7826-1-quic_qiancai@quicinc.com
Signed-off-by: Will Deacon <will@kernel.org>

5 files changed, 13 insertions, 8 deletions

diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index 9c348042a724..4508aba8a58b 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -32,7 +32,7 @@ pmd_t tmp_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
 static __init void *kasan_alloc_block(size_t size)
 {
 	return memblock_alloc_try_nid(size, size, __pa(MAX_DMA_ADDRESS),
-				      MEMBLOCK_ALLOC_KASAN, NUMA_NO_NODE);
+				      MEMBLOCK_ALLOC_NOLEAKTRACE, NUMA_NO_NODE);
 }
 
 static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr,
diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index 61b52a92b8b6..995ac7540e6a 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -36,7 +36,7 @@ static phys_addr_t __init kasan_alloc_zeroed_page(int node)
 {
 	void *p = memblock_alloc_try_nid(PAGE_SIZE, PAGE_SIZE,
 					      __pa(MAX_DMA_ADDRESS),
-					      MEMBLOCK_ALLOC_KASAN, node);
+					      MEMBLOCK_ALLOC_NOLEAKTRACE, node);
 	if (!p)
 		panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%llx\n",
 		      __func__, PAGE_SIZE, PAGE_SIZE, node,
@@ -49,7 +49,8 @@ static phys_addr_t __init kasan_alloc_raw_page(int node)
 {
 	void *p = memblock_alloc_try_nid_raw(PAGE_SIZE, PAGE_SIZE,
 						__pa(MAX_DMA_ADDRESS),
-						MEMBLOCK_ALLOC_KASAN, node);
+						MEMBLOCK_ALLOC_NOLEAKTRACE,
+						node);
 	if (!p)
 		panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%llx\n",
 		      __func__, PAGE_SIZE, PAGE_SIZE, node,
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index fd85b51b9d50..4b83b7a9fafb 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -96,7 +96,8 @@ static phys_addr_t __init early_pgtable_alloc(int shift)
 	phys_addr_t phys;
 	void *ptr;
 
-	phys = memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
+	phys = memblock_phys_alloc_range(PAGE_SIZE, PAGE_SIZE, 0,
+					 MEMBLOCK_ALLOC_NOLEAKTRACE);
 	if (!phys)
 		panic("Failed to allocate page table page\n");
 
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 34de69b3b8ba..efc896155dae 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -372,7 +372,7 @@ static inline int memblock_get_region_node(const struct memblock_region *r)
 /* Flags for memblock allocation APIs */
 #define MEMBLOCK_ALLOC_ANYWHERE	(~(phys_addr_t)0)
 #define MEMBLOCK_ALLOC_ACCESSIBLE	0
-#define MEMBLOCK_ALLOC_KASAN		1
+#define MEMBLOCK_ALLOC_NOLEAKTRACE	1
 
 /* We are using top down, so it is safe to use 0 here */
 #define MEMBLOCK_LOW_LIMIT 0
diff --git a/mm/memblock.c b/mm/memblock.c
index 184dcd2e5d99..fdc93a97bac2 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -287,7 +287,7 @@ static phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size,
 {
 	/* pump up @end */
 	if (end == MEMBLOCK_ALLOC_ACCESSIBLE ||
-	    end == MEMBLOCK_ALLOC_KASAN)
+	    end == MEMBLOCK_ALLOC_NOLEAKTRACE)
 		end = memblock.current_limit;
 
 	/* avoid allocating the first page */
@@ -1379,8 +1379,11 @@ again:
 	return 0;
 
 done:
-	/* Skip kmemleak for kasan_init() due to high volume. */
-	if (end != MEMBLOCK_ALLOC_KASAN)
+	/*
+	 * Skip kmemleak for those places like kasan_init() and
+	 * early_pgtable_alloc() due to high volume.
+	 */
+	if (end != MEMBLOCK_ALLOC_NOLEAKTRACE)
 		/*
 		 * The min_count is set to 0 so that memblock allocated
 		 * blocks are never reported as leaks. This is because many