linux-kernel - [PATCH 1/3] mm/memory: Change vmf_anon

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Message-ID: <20240220231424.126600-2-vishal.moola@gmail.com>
Date: Tue, 20 Feb 2024 15:14:22 -0800
From: "Vishal Moola (Oracle)" <vishal.moola@...il.com>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	muchun.song@...ux.dev,
	"Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: [PATCH 1/3] mm/memory: Change vmf_anon_prepare() to be non-static

In order to handle hugetlb faults under the VMA lock, hugetlb can use
vmf_anon_prepare() to ensure we can safely prepare an anon_vma. Change
it to be a non-static function so it can be used within hugetlb as well.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
---
 include/linux/hugetlb.h | 1 +
 mm/memory.c             | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index c1ee640d87b1..9b45edb6e303 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -272,6 +272,7 @@ void hugetlb_vma_unlock_write(struct vm_area_struct *vma);
 int hugetlb_vma_trylock_write(struct vm_area_struct *vma);
 void hugetlb_vma_assert_locked(struct vm_area_struct *vma);
 void hugetlb_vma_lock_release(struct kref *kref);
+vm_fault_t vmf_anon_prepare(struct vm_fault *vmf);
 
 int pmd_huge(pmd_t pmd);
 int pud_huge(pud_t pud);
diff --git a/mm/memory.c b/mm/memory.c
index 89bcae0b224d..c93b058adfb2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3081,7 +3081,7 @@ static inline vm_fault_t vmf_can_call_fault(const struct vm_fault *vmf)
 	return VM_FAULT_RETRY;
 }
 
-static vm_fault_t vmf_anon_prepare(struct vm_fault *vmf)
+vm_fault_t vmf_anon_prepare(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 
-- 
2.43.0