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authorSuren Baghdasaryan <surenb@google.com>2023-06-30 14:19:55 -0700
committerAndrew Morton <akpm@linux-foundation.org>2023-08-24 16:20:17 -0700
commitfdc724d6aa44efd75cc9b6a3c3900baac44bc50a (patch)
tree9397bcbed47a2dcd3622f96a5f812fe76f3b4ad4
parent4089eef0e6ac1a179c58304c657b3df3bb6fe509 (diff)
mm: change folio_lock_or_retry to use vm_fault directly
Change folio_lock_or_retry to accept vm_fault struct and return the vm_fault_t directly. Link: https://lkml.kernel.org/r/20230630211957.1341547-5-surenb@google.com Signed-off-by: Suren Baghdasaryan <surenb@google.com> Suggested-by: Matthew Wilcox <willy@infradead.org> Acked-by: Peter Xu <peterx@redhat.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Cc: David Hildenbrand <david@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Hillf Danton <hdanton@sina.com> Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jan Kara <jack@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Josef Bacik <josef@toxicpanda.com> Cc: Laurent Dufour <ldufour@linux.ibm.com> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Michel Lespinasse <michel@lespinasse.org> Cc: Minchan Kim <minchan@google.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Punit Agrawal <punit.agrawal@bytedance.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Yu Zhao <yuzhao@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--include/linux/pagemap.h11
-rw-r--r--mm/filemap.c22
-rw-r--r--mm/memory.c14
3 files changed, 24 insertions, 23 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index f4f24b594cd7..437e4526028c 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -916,8 +916,7 @@ static inline bool wake_page_match(struct wait_page_queue *wait_page,
void __folio_lock(struct folio *folio);
int __folio_lock_killable(struct folio *folio);
-bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm,
- unsigned int flags);
+vm_fault_t __folio_lock_or_retry(struct folio *folio, struct vm_fault *vmf);
void unlock_page(struct page *page);
void folio_unlock(struct folio *folio);
@@ -1021,11 +1020,13 @@ static inline int folio_lock_killable(struct folio *folio)
* Return value and mmap_lock implications depend on flags; see
* __folio_lock_or_retry().
*/
-static inline bool folio_lock_or_retry(struct folio *folio,
- struct mm_struct *mm, unsigned int flags)
+static inline vm_fault_t folio_lock_or_retry(struct folio *folio,
+ struct vm_fault *vmf)
{
might_sleep();
- return folio_trylock(folio) || __folio_lock_or_retry(folio, mm, flags);
+ if (!folio_trylock(folio))
+ return __folio_lock_or_retry(folio, vmf);
+ return 0;
}
/*
diff --git a/mm/filemap.c b/mm/filemap.c
index dd022b065614..40514493014a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1669,32 +1669,34 @@ static int __folio_lock_async(struct folio *folio, struct wait_page_queue *wait)
/*
* Return values:
- * true - folio is locked; mmap_lock is still held.
- * false - folio is not locked.
+ * 0 - folio is locked.
+ * non-zero - folio is not locked.
* mmap_lock has been released (mmap_read_unlock(), unless flags had both
* FAULT_FLAG_ALLOW_RETRY and FAULT_FLAG_RETRY_NOWAIT set, in
* which case mmap_lock is still held.
*
- * If neither ALLOW_RETRY nor KILLABLE are set, will always return true
+ * If neither ALLOW_RETRY nor KILLABLE are set, will always return 0
* with the folio locked and the mmap_lock unperturbed.
*/
-bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm,
- unsigned int flags)
+vm_fault_t __folio_lock_or_retry(struct folio *folio, struct vm_fault *vmf)
{
+ struct mm_struct *mm = vmf->vma->vm_mm;
+ unsigned int flags = vmf->flags;
+
if (fault_flag_allow_retry_first(flags)) {
/*
* CAUTION! In this case, mmap_lock is not released
- * even though return 0.
+ * even though return VM_FAULT_RETRY.
*/
if (flags & FAULT_FLAG_RETRY_NOWAIT)
- return false;
+ return VM_FAULT_RETRY;
mmap_read_unlock(mm);
if (flags & FAULT_FLAG_KILLABLE)
folio_wait_locked_killable(folio);
else
folio_wait_locked(folio);
- return false;
+ return VM_FAULT_RETRY;
}
if (flags & FAULT_FLAG_KILLABLE) {
bool ret;
@@ -1702,13 +1704,13 @@ bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm,
ret = __folio_lock_killable(folio);
if (ret) {
mmap_read_unlock(mm);
- return false;
+ return VM_FAULT_RETRY;
}
} else {
__folio_lock(folio);
}
- return true;
+ return 0;
}
/**
diff --git a/mm/memory.c b/mm/memory.c
index b9c3780fd426..080e1d59d752 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3599,6 +3599,7 @@ static vm_fault_t remove_device_exclusive_entry(struct vm_fault *vmf)
struct folio *folio = page_folio(vmf->page);
struct vm_area_struct *vma = vmf->vma;
struct mmu_notifier_range range;
+ vm_fault_t ret;
/*
* We need a reference to lock the folio because we don't hold
@@ -3611,9 +3612,10 @@ static vm_fault_t remove_device_exclusive_entry(struct vm_fault *vmf)
if (!folio_try_get(folio))
return 0;
- if (!folio_lock_or_retry(folio, vma->vm_mm, vmf->flags)) {
+ ret = folio_lock_or_retry(folio, vmf);
+ if (ret) {
folio_put(folio);
- return VM_FAULT_RETRY;
+ return ret;
}
mmu_notifier_range_init_owner(&range, MMU_NOTIFY_EXCLUSIVE, 0,
vma->vm_mm, vmf->address & PAGE_MASK,
@@ -3738,7 +3740,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
bool exclusive = false;
swp_entry_t entry;
pte_t pte;
- int locked;
vm_fault_t ret = 0;
void *shadow = NULL;
@@ -3861,12 +3862,9 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
goto out_release;
}
- locked = folio_lock_or_retry(folio, vma->vm_mm, vmf->flags);
-
- if (!locked) {
- ret |= VM_FAULT_RETRY;
+ ret |= folio_lock_or_retry(folio, vmf);
+ if (ret & VM_FAULT_RETRY)
goto out_release;
- }
if (swapcache) {
/*