[PATCH 4/8] mm/memory-failure: Convert shake_page() to shake_folio()

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

Removes two calls to compound_head().  Move the prototype to
internal.h; we definitely don't want code outside mm using it.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 include/linux/mm.h   |  1 -
 mm/hwpoison-inject.c | 11 ++++++-----
 mm/internal.h        |  1 +
 mm/memory-failure.c  | 15 ++++++++++-----
 4 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 03e4841673d7..184f57cdab60 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3962,7 +3962,6 @@ int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index,
 extern int memory_failure(unsigned long pfn, int flags);
 extern void memory_failure_queue_kick(int cpu);
 extern int unpoison_memory(unsigned long pfn);
-extern void shake_page(struct page *p);
 extern atomic_long_t num_poisoned_pages __read_mostly;
 extern int soft_offline_page(unsigned long pfn, int flags);
 #ifdef CONFIG_MEMORY_FAILURE
diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
index d0548e382b6b..c9d653f51e45 100644
--- a/mm/hwpoison-inject.c
+++ b/mm/hwpoison-inject.c
@@ -15,7 +15,7 @@ static int hwpoison_inject(void *data, u64 val)
 {
 	unsigned long pfn = val;
 	struct page *p;
-	struct page *hpage;
+	struct folio *folio;
 	int err;
 
 	if (!capable(CAP_SYS_ADMIN))
@@ -25,16 +25,17 @@ static int hwpoison_inject(void *data, u64 val)
 		return -ENXIO;
 
 	p = pfn_to_page(pfn);
-	hpage = compound_head(p);
+	folio = page_folio(p);
 
 	if (!hwpoison_filter_enable)
 		goto inject;
 
-	shake_page(hpage);
+	shake_folio(folio);
 	/*
 	 * This implies unable to support non-LRU pages except free page.
 	 */
-	if (!PageLRU(hpage) && !PageHuge(p) && !is_free_buddy_page(p))
+	if (!folio_test_lru(folio) && !folio_test_hugetlb(folio) &&
+	    !is_free_buddy_page(p))
 		return 0;
 
 	/*
@@ -42,7 +43,7 @@ static int hwpoison_inject(void *data, u64 val)
 	 * the targeted owner (or on a free page).
 	 * memory_failure() will redo the check reliably inside page lock.
 	 */
-	err = hwpoison_filter(hpage);
+	err = hwpoison_filter(&folio->page);
 	if (err)
 		return 0;
 
diff --git a/mm/internal.h b/mm/internal.h
index 13f4d6ccccdf..b900730f43c0 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -855,6 +855,7 @@ static inline int find_next_best_node(int node, nodemask_t *used_node_mask)
 /*
  * mm/memory-failure.c
  */
+void shake_folio(struct folio *folio);
 extern int hwpoison_filter(struct page *p);
 
 extern u32 hwpoison_filter_dev_major;
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 40a8964954e5..27dc21063552 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -358,20 +358,25 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
  * Unknown page type encountered. Try to check whether it can turn PageLRU by
  * lru_add_drain_all.
  */
-void shake_page(struct page *p)
+void shake_folio(struct folio *folio)
 {
-	if (PageHuge(p))
+	if (folio_test_hugetlb(folio))
 		return;
 	/*
 	 * TODO: Could shrink slab caches here if a lightweight range-based
 	 * shrinker will be available.
 	 */
-	if (PageSlab(p))
+	if (folio_test_slab(folio))
 		return;
 
 	lru_add_drain_all();
 }
-EXPORT_SYMBOL_GPL(shake_page);
+EXPORT_SYMBOL_GPL(shake_folio);
+
+static void shake_page(struct page *page)
+{
+	shake_folio(page_folio(page));
+}
 
 static unsigned long dev_pagemap_mapping_shift(struct vm_area_struct *vma,
 		unsigned long address)
@@ -1639,7 +1644,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
 	 * shake_page() again to ensure that it's flushed.
 	 */
 	if (mlocked)
-		shake_page(hpage);
+		shake_folio(folio);
 
 	/*
 	 * Now that the dirty bit has been propagated to the
-- 
2.43.0