linux-kernel - [PATCH v2 1/5] mm/memory: Change vmf_anon

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Date: Wed, 21 Feb 2024 15:47:28 -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,
	willy@...radead.org,
	"Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: [PATCH v2 1/5] 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>
---
 mm/internal.h | 1 +
 mm/memory.c   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/internal.h b/mm/internal.h
index f309a010d50f..b9b6b2bc1663 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -103,6 +103,7 @@ static inline void wake_throttle_isolated(pg_data_t *pgdat)
 		wake_up(wqh);
 }
 
+vm_fault_t vmf_anon_prepare(struct vm_fault *vmf);
 vm_fault_t do_swap_page(struct vm_fault *vmf);
 void folio_rotate_reclaimable(struct folio *folio);
 bool __folio_end_writeback(struct folio *folio);
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