linux-kernel - [PATCH v3 2/3] x86/mm/pat: Cleanup unused parameter in follow

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Date: Thu, 11 Jan 2024 20:09:28 +0800
From: Wupeng Ma <mawupeng1@...wei.com>
To: <akpm@...ux-foundation.org>, <dave.hansen@...ux.intel.com>,
	<luto@...nel.org>, <tglx@...utronix.de>, <peterz@...radead.org>
CC: <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <mawupeng1@...wei.com>,
	<bp@...e.de>, <mingo@...hat.com>
Subject: [PATCH v3 2/3] x86/mm/pat: Cleanup unused parameter in follow_phys

From: Ma Wupeng <mawupeng1@...wei.com>

Parameter flags is always zero in caller untrack_pfn() and
track_pfn_copy(). let's drop it.

Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
---
 arch/x86/mm/pat/memtype.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index a6a88679c92e..94bcba399701 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -951,8 +951,8 @@ static void free_pfn_range(u64 paddr, unsigned long size)
 }
 
 static int follow_phys(struct vm_area_struct *vma,
-		unsigned long address, unsigned int flags,
-		unsigned long *prot, resource_size_t *phys)
+		unsigned long address,  unsigned long *prot,
+		resource_size_t *phys)
 {
 	int ret = -EINVAL;
 	pte_t *ptep, pte;
@@ -965,9 +965,6 @@ static int follow_phys(struct vm_area_struct *vma,
 		goto out;
 	pte = ptep_get(ptep);
 
-	if ((flags & FOLL_WRITE) && !pte_write(pte))
-		goto unlock;
-
 	*prot = pgprot_val(pte_pgprot(pte));
 	*phys = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT;
 
@@ -997,7 +994,7 @@ int track_pfn_copy(struct vm_area_struct *vma)
 		 * reserve the whole chunk covered by vma. We need the
 		 * starting address and protection from pte.
 		 */
-		if (follow_phys(vma, vma->vm_start, 0, &prot, &paddr)) {
+		if (follow_phys(vma, vma->vm_start, &prot, &paddr)) {
 			WARN_ON_ONCE(1);
 			return -EINVAL;
 		}
@@ -1084,7 +1081,7 @@ void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,
 	/* free the chunk starting from pfn or the whole chunk */
 	paddr = (resource_size_t)pfn << PAGE_SHIFT;
 	if (!paddr && !size) {
-		if (follow_phys(vma, vma->vm_start, 0, &prot, &paddr)) {
+		if (follow_phys(vma, vma->vm_start, &prot, &paddr)) {
 			WARN_ON_ONCE(1);
 			return;
 		}
-- 
2.25.1