--- zzzz-none-000/linux-4.1.52/fs/inode.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/fs/inode.c	2022-03-02 11:37:13.000000000 +0000
@@ -20,6 +20,10 @@
 #include <linux/list_lru.h>
 #include <trace/events/writeback.h>
 #include "internal.h"
+#if defined(CONFIG_BCM_KF_512MB_DDR) && defined(CONFIG_BCM_512MB_DDR)
+#include "./ubifs/ubifs.h"
+#include <linux/magic.h>
+#endif
 
 /*
  * Inode locking rules:
@@ -169,6 +173,12 @@
 	mapping->host = inode;
 	mapping->flags = 0;
 	atomic_set(&mapping->i_mmap_writable, 0);
+#if defined(CONFIG_BCM_KF_512MB_DDR) && defined(CONFIG_BCM_512MB_DDR)
+    /* force jffs2 and ubifs to use lowmem */
+	if (sb->s_magic == UBIFS_SUPER_MAGIC || sb->s_magic == JFFS2_SUPER_MAGIC || sb->s_magic == SQUASHFS_MAGIC)
+		mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE & (~__GFP_HIGHMEM));
+	else
+#endif
 	mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE);
 	mapping->private_data = NULL;
 	mapping->writeback_index = 0;