linux-kernel - [PATCH 4/7] mm: rework the parameter of lock_page_or

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Message-Id: <20210718043034.76431-5-zhengqi.arch@bytedance.com>
Date:   Sun, 18 Jul 2021 12:30:30 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org, tglx@...utronix.de, hannes@...xchg.org,
        mhocko@...nel.org, vdavydov.dev@...il.com
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, songmuchun@...edance.com,
        Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH 4/7] mm: rework the parameter of lock_page_or_retry()

we need the vmf in lock_page_or_retry() in the subsequent patch,
so pass in it directly.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 include/linux/pagemap.h | 8 +++-----
 mm/filemap.c            | 6 ++++--
 mm/memory.c             | 4 ++--
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index b071babc6629..bc23f6ff4fce 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -653,8 +653,7 @@ static inline bool wake_page_match(struct wait_page_queue *wait_page,
 extern void __lock_page(struct page *page);
 extern int __lock_page_killable(struct page *page);
 extern int __lock_page_async(struct page *page, struct wait_page_queue *wait);
-extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
-				unsigned int flags);
+extern int __lock_page_or_retry(struct page *page, struct vm_fault *vmf);
 extern void unlock_page(struct page *page);
 
 /*
@@ -712,11 +711,10 @@ static inline int lock_page_async(struct page *page,
  * Return value and mmap_lock implications depend on flags; see
  * __lock_page_or_retry().
  */
-static inline int lock_page_or_retry(struct page *page, struct mm_struct *mm,
-				     unsigned int flags)
+static inline int lock_page_or_retry(struct page *page, struct vm_fault *vmf)
 {
 	might_sleep();
-	return trylock_page(page) || __lock_page_or_retry(page, mm, flags);
+	return trylock_page(page) || __lock_page_or_retry(page, vmf);
 }
 
 /*
diff --git a/mm/filemap.c b/mm/filemap.c
index 4955641f2cf0..db0184884890 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1686,9 +1686,11 @@ int __lock_page_async(struct page *page, struct wait_page_queue *wait)
  * If neither ALLOW_RETRY nor KILLABLE are set, will always return 1
  * with the page locked and the mmap_lock unperturbed.
  */
-int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
-			 unsigned int flags)
+int __lock_page_or_retry(struct page *page, struct vm_fault *vmf)
 {
+	unsigned int flags = vmf->flags;
+	struct mm_struct *mm = vmf->vma->vm_mm;
+
 	if (fault_flag_allow_retry_first(flags)) {
 		/*
 		 * CAUTION! In this case, mmap_lock is not released
diff --git a/mm/memory.c b/mm/memory.c
index 540f0c9d0970..3bf2636413ee 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3451,7 +3451,7 @@ static vm_fault_t remove_device_exclusive_entry(struct vm_fault *vmf)
 	struct vm_area_struct *vma = vmf->vma;
 	struct mmu_notifier_range range;
 
-	if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags))
+	if (!lock_page_or_retry(page, vmf))
 		return VM_FAULT_RETRY;
 	mmu_notifier_range_init_owner(&range, MMU_NOTIFY_EXCLUSIVE, 0, vma,
 				vma->vm_mm, vmf->address & PAGE_MASK,
@@ -3583,7 +3583,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
 		goto out_release;
 	}
 
-	locked = lock_page_or_retry(page, vma->vm_mm, vmf->flags);
+	locked = lock_page_or_retry(page, vmf);
 
 	delayacct_clear_flag(current, DELAYACCT_PF_SWAPIN);
 	if (!locked) {
-- 
2.11.0