Commit 47dd2e63 authored by Ritesh Harjani (IBM)'s avatar Ritesh Harjani (IBM) Committed by Michael Ellerman
Browse files

book3s64/hash: Disable debug_pagealloc if it requires more memory 



Make size of the linear map to be allocated in RMA region to be of
ppc64_rma_size / 4. If debug_pagealloc requires more memory than that
then do not allocate any memory and disable debug_pagealloc.

Signed-off-by: default avatarRitesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/e1ef66f32a1fe63bcbb89d5c11d86c65beef5ded.1729271995.git.ritesh.list@gmail.com
parent 685d942d

arch/powerpc/mm/book3s64/hash_utils.c

+14 −1
Original line number Diff line number Diff line
@@ -331,9 +331,19 @@ static unsigned long linear_map_hash_count; 
static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);

static inline void hash_debug_pagealloc_alloc_slots(void)

{

	unsigned long max_hash_count = ppc64_rma_size / 4;



	if (!debug_pagealloc_enabled())

		return;

	linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;

	if (unlikely(linear_map_hash_count > max_hash_count)) {

		pr_info("linear map size (%llu) greater than 4 times RMA region (%llu). Disabling debug_pagealloc\n",

			((u64)linear_map_hash_count << PAGE_SHIFT),

			ppc64_rma_size);

		linear_map_hash_count = 0;

		return;

	}



	linear_map_hash_slots = memblock_alloc_try_nid(

			linear_map_hash_count, 1, MEMBLOCK_LOW_LIMIT,

			ppc64_rma_size,	NUMA_NO_NODE);
@@ -344,7 +354,7 @@ static inline void hash_debug_pagealloc_alloc_slots(void) 


static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr, int slot)

{

	if (!debug_pagealloc_enabled())

	if (!debug_pagealloc_enabled() || !linear_map_hash_count)

		return;

	if ((paddr >> PAGE_SHIFT) < linear_map_hash_count)

		linear_map_hash_slots[paddr >> PAGE_SHIFT] = slot | 0x80;
@@ -356,6 +366,9 @@ static int hash_debug_pagealloc_map_pages(struct page *page, int numpages, 
	unsigned long flags, vaddr, lmi;

	int i;



	if (!debug_pagealloc_enabled() || !linear_map_hash_count)

		return 0;



	local_irq_save(flags);

	for (i = 0; i < numpages; i++, page++) {

		vaddr = (unsigned long)page_address(page);