From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Mon, 24 Aug 2020 16:22:27 +0000 (-0400)
Subject: fork: Now with dup tree
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=a89b3d3cac66777d171591e06f5224b453549b11;p=users%2Fjedix%2Flinux-maple.git

fork: Now with dup tree

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---

diff --git a/kernel/fork.c b/kernel/fork.c
index 1bb1ff1c33703..8fd147e1e7e73 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -473,6 +473,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
 	int retval;
 	unsigned long charge;
 	MA_STATE(old_mas, &oldmm->mm_mt, 0, 0);
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
 	LIST_HEAD(uf);
 	MA_STATE(old_mas, &oldmm->mm_mt, 0, 0);
 	struct vm_area_struct *old_vma;
@@ -508,6 +509,9 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
 	prev = NULL;
 
 	rcu_read_lock();
+	mas_dup_tree(&old_mas, &mas);
+	mas_reset(&old_mas);
+
 	mas_for_each(&old_mas, mpnt, ULONG_MAX) {
 		struct file *file;