From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/mm/huge_memory.c | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/kernel/mm/huge_memory.c b/kernel/mm/huge_memory.c
index 993816e..14bc799 100644
--- a/kernel/mm/huge_memory.c
+++ b/kernel/mm/huge_memory.c
@@ -1994,7 +1994,7 @@
{
struct mm_struct *mm = vma->vm_mm;
pgtable_t pgtable;
- pmd_t _pmd;
+ pmd_t _pmd, old_pmd;
int i;
/*
@@ -2005,7 +2005,7 @@
*
* See Documentation/vm/mmu_notifier.rst
*/
- pmdp_huge_clear_flush(vma, haddr, pmd);
+ old_pmd = pmdp_huge_clear_flush(vma, haddr, pmd);
pgtable = pgtable_trans_huge_withdraw(mm, pmd);
pmd_populate(mm, &_pmd, pgtable);
@@ -2014,6 +2014,8 @@
pte_t *pte, entry;
entry = pfn_pte(my_zero_pfn(haddr), vma->vm_page_prot);
entry = pte_mkspecial(entry);
+ if (pmd_uffd_wp(old_pmd))
+ entry = pte_mkuffd_wp(entry);
pte = pte_offset_map(&_pmd, haddr);
VM_BUG_ON(!pte_none(*pte));
set_pte_at(mm, haddr, pte, entry);
@@ -2816,6 +2818,9 @@
if (PageSwapCache(page))
return;
+ if (!list_empty(page_deferred_list(page)))
+ return;
+
spin_lock_irqsave(&ds_queue->split_queue_lock, flags);
if (list_empty(page_deferred_list(page))) {
count_vm_event(THP_DEFERRED_SPLIT_PAGE);
--
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