linux-kernel - [PATCH 4/5] mm: Make pgoff non-const in struct vm

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Date: Mon, 25 Mar 2024 15:33:38 -0700
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 4/5] mm: Make pgoff non-const in struct vm_fault

Hugetlb calculates addresses and page offsets differently from the rest of
mm. In order to pass struct vm_fault through the fault pathway we will let
hugetlb_fault() and __handle_mm_fault() set those variables themselves
instead.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
---
 include/linux/mm.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index f5a97dec5169..c6874aa7b7f0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -507,10 +507,11 @@ struct vm_fault {
 	const struct {
 		struct vm_area_struct *vma;	/* Target VMA */
 		gfp_t gfp_mask;			/* gfp mask to be used for allocations */
-		pgoff_t pgoff;			/* Logical page offset based on vma */
-		unsigned long address;		/* Faulting virtual address - masked */
 		unsigned long real_address;	/* Faulting virtual address - unmasked */
 	};
+	unsigned long address;		/* Faulting virtual address - masked */
+	pgoff_t pgoff;			/* Logical page offset based on vma */
+
 	enum fault_flag flags;		/* FAULT_FLAG_xxx flags
 					 * XXX: should really be 'const' */
 	pmd_t *pmd;			/* Pointer to pmd entry matching
-- 
2.43.0