mm: page_alloc: move pm_* function into power

pm_restrict_gfp_mask()/pm_restore_gfp_mask() only used in power, let's
move them out of page_alloc.c.

Adding a general gfp_has_io_fs() function which return true if gfp with
both __GFP_IO and __GFP_FS flags, then use it inside of
pm_suspended_storage(), also the pm_suspended_storage() is moved into
suspend.h.

Link: https://lkml.kernel.org/r/20230516063821.121844-11-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Len Brown <len.brown@intel.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/gfp.h

@@ -338,20 +338,13 @@ extern gfp_t gfp_allowed_mask;
 /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */
 bool gfp_pfmemalloc_allowed(gfp_t gfp_mask);
 
-extern void pm_restrict_gfp_mask(void);
-extern void pm_restore_gfp_mask(void);
+static inline bool gfp_has_io_fs(gfp_t gfp)
+{
+	return (gfp & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS);
+}
 
 extern gfp_t vma_thp_gfp_mask(struct vm_area_struct *vma);
 
-#ifdef CONFIG_PM_SLEEP
-extern bool pm_suspended_storage(void);
-#else
-static inline bool pm_suspended_storage(void)
-{
-	return false;
-}
-#endif /* CONFIG_PM_SLEEP */
-
 #ifdef CONFIG_CONTIG_ALLOC
 /* The below functions must be run on a range from a single zone. */
 extern int alloc_contig_range(unsigned long start, unsigned long end,

include/linux/suspend.h

@@ -502,6 +502,11 @@ extern void pm_report_max_hw_sleep(u64 t);
 extern bool events_check_enabled;
 extern suspend_state_t pm_suspend_target_state;
 
+static inline bool pm_suspended_storage(void)
+{
+	return !gfp_has_io_fs(gfp_allowed_mask);
+}
+
 extern bool pm_wakeup_pending(void);
 extern void pm_system_wakeup(void);
 extern void pm_system_cancel_wakeup(void);
@@ -535,6 +540,7 @@ static inline void ksys_sync_helper(void) {}
 
 #define pm_notifier(fn, pri)	do { (void)(fn); } while (0)
 
+static inline bool pm_suspended_storage(void) { return false; }
 static inline bool pm_wakeup_pending(void) { return false; }
 static inline void pm_system_wakeup(void) {}
 static inline void pm_wakeup_clear(bool reset) {}

kernel/power/main.c

@@ -21,6 +21,33 @@
 #include "power.h"
 
 #ifdef CONFIG_PM_SLEEP
+/*
+ * The following functions are used by the suspend/hibernate code to temporarily
+ * change gfp_allowed_mask in order to avoid using I/O during memory allocations
+ * while devices are suspended.  To avoid races with the suspend/hibernate code,
+ * they should always be called with system_transition_mutex held
+ * (gfp_allowed_mask also should only be modified with system_transition_mutex
+ * held, unless the suspend/hibernate code is guaranteed not to run in parallel
+ * with that modification).
+ */
+static gfp_t saved_gfp_mask;
+
+void pm_restore_gfp_mask(void)
+{
+	WARN_ON(!mutex_is_locked(&system_transition_mutex));
+	if (saved_gfp_mask) {
+		gfp_allowed_mask = saved_gfp_mask;
+		saved_gfp_mask = 0;
+	}
+}
+
+void pm_restrict_gfp_mask(void)
+{
+	WARN_ON(!mutex_is_locked(&system_transition_mutex));
+	WARN_ON(saved_gfp_mask);
+	saved_gfp_mask = gfp_allowed_mask;
+	gfp_allowed_mask &= ~(__GFP_IO | __GFP_FS);
+}
 
 unsigned int lock_system_sleep(void)
 {

kernel/power/power.h

@@ -216,6 +216,11 @@ static inline void suspend_test_finish(const char *label) {}
 /* kernel/power/main.c */
 extern int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down);
 extern int pm_notifier_call_chain(unsigned long val);
+void pm_restrict_gfp_mask(void);
+void pm_restore_gfp_mask(void);
+#else
+static inline void pm_restrict_gfp_mask(void) {}
+static inline void pm_restore_gfp_mask(void) {}
 #endif
 
 #ifdef CONFIG_HIGHMEM

mm/page_alloc.c

@@ -227,44 +227,6 @@ static inline void set_pcppage_migratetype(struct page *page, int migratetype)
 	page->index = migratetype;
 }
 
-#ifdef CONFIG_PM_SLEEP
-/*
- * The following functions are used by the suspend/hibernate code to temporarily
- * change gfp_allowed_mask in order to avoid using I/O during memory allocations
- * while devices are suspended.  To avoid races with the suspend/hibernate code,
- * they should always be called with system_transition_mutex held
- * (gfp_allowed_mask also should only be modified with system_transition_mutex
- * held, unless the suspend/hibernate code is guaranteed not to run in parallel
- * with that modification).
- */
-
-static gfp_t saved_gfp_mask;
-
-void pm_restore_gfp_mask(void)
-{
-	WARN_ON(!mutex_is_locked(&system_transition_mutex));
-	if (saved_gfp_mask) {
-		gfp_allowed_mask = saved_gfp_mask;
-		saved_gfp_mask = 0;
-	}
-}
-
-void pm_restrict_gfp_mask(void)
-{
-	WARN_ON(!mutex_is_locked(&system_transition_mutex));
-	WARN_ON(saved_gfp_mask);
-	saved_gfp_mask = gfp_allowed_mask;
-	gfp_allowed_mask &= ~(__GFP_IO | __GFP_FS);
-}
-
-bool pm_suspended_storage(void)
-{
-	if ((gfp_allowed_mask & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS))
-		return false;
-	return true;
-}
-#endif /* CONFIG_PM_SLEEP */
-
 #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
 unsigned int pageblock_order __read_mostly;
 #endif

mm/swapfile.c

@@ -41,6 +41,7 @@
 #include <linux/swap_slots.h>
 #include <linux/sort.h>
 #include <linux/completion.h>
+#include <linux/suspend.h>
 
 #include <asm/tlbflush.h>
 #include <linux/swapops.h>