From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Thu, 1 Oct 2020 14:03:48 +0000 (-0400)
Subject: kernel/fork: Don't take spinlock of maple tree.
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=528ee5dcc0289ee6abbc0d266f7dae3590e74a6e;p=users%2Fjedix%2Flinux-maple.git

kernel/fork: Don't take spinlock of maple tree.

You cannot take the spinlock of the maple tree and then allocate VMAs.

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

diff --git a/kernel/fork.c b/kernel/fork.c
index 09b77bb73bc16..35f13110e2edd 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -510,7 +510,6 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
 	if (retval)
 		goto fail_nomem;
 
-	mas_lock(&old_mas);
 	mas_for_each(&old_mas, mpnt, ULONG_MAX) {
 		struct file *file;
 
@@ -607,7 +606,6 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
 	/* a new mm has just been created */
 	retval = arch_dup_mmap(oldmm, mm);
 loop_out:
-	mas_unlock(&old_mas);
 out:
 	mmap_write_unlock(mm);
 	flush_tlb_mm(oldmm);