linux-kernel - [PATCH 1/1] mm/gup: pass flags by value in faultin

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Date: Sun, 17 Mar 2024 15:46:11 +0300
From: yorha.op@...il.com
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Alex Rusuf <yorha.op@...il.com>
Subject: [PATCH 1/1] mm/gup: pass flags by value in faultin_page

From: Alex Rusuf <yorha.op@...il.com>

There's no need to pass flags as a pointer,
because it's not expected to be changed now.

Signed-off-by: Alex Rusuf <yorha.op@...il.com>
---
 mm/gup.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index 231711efa390..f308785fa530 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -915,19 +915,19 @@ static int get_gate_page(struct mm_struct *mm, unsigned long address,
  * to 0 and -EBUSY returned.
  */
 static int faultin_page(struct vm_area_struct *vma,
-		unsigned long address, unsigned int *flags, bool unshare,
+		unsigned long address, unsigned int flags, bool unshare,
 		int *locked)
 {
 	unsigned int fault_flags = 0;
 	vm_fault_t ret;
 
-	if (*flags & FOLL_NOFAULT)
+	if (flags & FOLL_NOFAULT)
 		return -EFAULT;
-	if (*flags & FOLL_WRITE)
+	if (flags & FOLL_WRITE)
 		fault_flags |= FAULT_FLAG_WRITE;
-	if (*flags & FOLL_REMOTE)
+	if (flags & FOLL_REMOTE)
 		fault_flags |= FAULT_FLAG_REMOTE;
-	if (*flags & FOLL_UNLOCKABLE) {
+	if (flags & FOLL_UNLOCKABLE) {
 		fault_flags |= FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 		/*
 		 * FAULT_FLAG_INTERRUPTIBLE is opt-in. GUP callers must set
@@ -935,12 +935,12 @@ static int faultin_page(struct vm_area_struct *vma,
 		 * That's because some callers may not be prepared to
 		 * handle early exits caused by non-fatal signals.
 		 */
-		if (*flags & FOLL_INTERRUPTIBLE)
+		if (flags & FOLL_INTERRUPTIBLE)
 			fault_flags |= FAULT_FLAG_INTERRUPTIBLE;
 	}
-	if (*flags & FOLL_NOWAIT)
+	if (flags & FOLL_NOWAIT)
 		fault_flags |= FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_RETRY_NOWAIT;
-	if (*flags & FOLL_TRIED) {
+	if (flags & FOLL_TRIED) {
 		/*
 		 * Note: FAULT_FLAG_ALLOW_RETRY and FAULT_FLAG_TRIED
 		 * can co-exist
@@ -974,7 +974,7 @@ static int faultin_page(struct vm_area_struct *vma,
 	}
 
 	if (ret & VM_FAULT_ERROR) {
-		int err = vm_fault_to_errno(ret, *flags);
+		int err = vm_fault_to_errno(ret, flags);
 
 		if (err)
 			return err;
@@ -1236,7 +1236,7 @@ static long __get_user_pages(struct mm_struct *mm,
 
 		page = follow_page_mask(vma, start, foll_flags, &ctx);
 		if (!page || PTR_ERR(page) == -EMLINK) {
-			ret = faultin_page(vma, start, &foll_flags,
+			ret = faultin_page(vma, start, foll_flags,
 					   PTR_ERR(page) == -EMLINK, locked);
 			switch (ret) {
 			case 0:
-- 
2.42.0