mm: make show_free_areas() static

All callers of show_free_areas() pass 0 and NULL, so we can directly use
show_mem() instead of show_free_areas(0, NULL), which could make
show_free_areas() a static function.

Link: https://lkml.kernel.org/r/20230630062253.189440-2-wangkefeng.wang@huawei.comSigned-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/sparc/kernel/setup_32.c

@@ -83,7 +83,7 @@ static void prom_sync_me(void)
 			     "nop\n\t" : : "r" (&trapbase));
 
 	prom_printf("PROM SYNC COMMAND...\n");
-	show_free_areas(0, NULL);
+	show_mem();
 	if (!is_idle_task(current)) {
 		local_irq_enable();
 		ksys_sync();

include/linux/mm.h

@@ -2236,18 +2236,6 @@ extern void pagefault_out_of_memory(void);
 #define offset_in_thp(page, p)	((unsigned long)(p) & (thp_size(page) - 1))
 #define offset_in_folio(folio, p) ((unsigned long)(p) & (folio_size(folio) - 1))
 
-/*
- * Flags passed to show_mem() and show_free_areas() to suppress output in
- * various contexts.
- */
-#define SHOW_MEM_FILTER_NODES		(0x0001u)	/* disallowed nodes */
-
-extern void __show_free_areas(unsigned int flags, nodemask_t *nodemask, int max_zone_idx);
-static void __maybe_unused show_free_areas(unsigned int flags, nodemask_t *nodemask)
-{
-	__show_free_areas(flags, nodemask, MAX_NR_ZONES - 1);
-}
-
 /*
  * Parameter block passed down to zap_pte_range in exceptional cases.
  */

mm/internal.h

@@ -61,6 +61,12 @@ void page_writeback_init(void);
 #define COMPOUND_MAPPED		0x800000
 #define FOLIO_PAGES_MAPPED	(COMPOUND_MAPPED - 1)
 
+/*
+ * Flags passed to __show_mem() and show_free_areas() to suppress output in
+ * various contexts.
+ */
+#define SHOW_MEM_FILTER_NODES		(0x0001u)	/* disallowed nodes */
+
 /*
  * How many individual pages have an elevated _mapcount.  Excludes
  * the folio's entire_mapcount.

mm/nommu.c

@@ -1003,7 +1003,7 @@ static int do_mmap_private(struct vm_area_struct *vma,
 enomem:
 	pr_err("Allocation of length %lu from process %d (%s) failed\n",
 	       len, current->pid, current->comm);
-	show_free_areas(0, NULL);
+	show_mem();
 	return -ENOMEM;
 }
 
@@ -1236,20 +1236,20 @@ unsigned long do_mmap(struct file *file,
 	kmem_cache_free(vm_region_jar, region);
 	pr_warn("Allocation of vma for %lu byte allocation from process %d failed\n",
 			len, current->pid);
-	show_free_areas(0, NULL);
+	show_mem();
 	return -ENOMEM;
 
 error_getting_region:
 	pr_warn("Allocation of vm region for %lu byte allocation from process %d failed\n",
 			len, current->pid);
-	show_free_areas(0, NULL);
+	show_mem();
 	return -ENOMEM;
 
 error_vma_iter_prealloc:
 	kmem_cache_free(vm_region_jar, region);
 	vm_area_free(vma);
 	pr_warn("Allocation of vma tree for process %d failed\n", current->pid);
-	show_free_areas(0, NULL);
+	show_mem();
 	return -ENOMEM;
 
 }

mm/show_mem.c

@@ -186,7 +186,7 @@ static bool node_has_managed_zones(pg_data_t *pgdat, int max_zone_idx)
  * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's
  *   cpuset.
  */
-void __show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
+static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
 {
 	unsigned long free_pcp = 0;
 	int cpu, nid;
@@ -406,7 +406,7 @@ void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
 	struct zone *zone;
 
 	printk("Mem-Info:\n");
-	__show_free_areas(filter, nodemask, max_zone_idx);
+	show_free_areas(filter, nodemask, max_zone_idx);
 
 	for_each_populated_zone(zone) {