Attempt migration to Buildroot 2017.08 + kernel 4.12.

Build fails at: https://git.busybox.net/buildroot/commit/?id=c128c5f3c79b31d89256ffbc5c650ba613d3d52b

buildroot_config_fragment

@@ -1,3 +1,7 @@
+# Must match the Linux kernel source.
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.12"
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_12=y
+
 BR2_GLOBAL_PATCH_DIR="../global_patch_dir"
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="../kernel_config_fragment"
 BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="../busybox_config_fragment"

kernel_module/anonymous_inode.c

@@ -10,7 +10,6 @@ This method allows getting multiple file descriptors from a single filesystem,
 which reduces namespace pollution.
 */
 
-#include <asm/uaccess.h> /* copy_from_user, copy_to_user */
 #include <linux/anon_inodes.h>
 #include <linux/debugfs.h>
 #include <linux/errno.h> /* EFAULT */
@@ -19,6 +18,7 @@ which reduces namespace pollution.
 #include <linux/kernel.h> /* min */
 #include <linux/module.h>
 #include <linux/printk.h> /* printk */
+#include <linux/uaccess.h> /* copy_from_user */
 
 #include "anonymous_inode.h"
 

kernel_module/fops.c

@@ -17,13 +17,13 @@ in drivers (syscalls being the other one).
 Here we use debugfs.
 */
 
-#include <asm/uaccess.h> /* copy_from_user, copy_to_user */
 #include <linux/debugfs.h>
 #include <linux/errno.h> /* EFAULT */
 #include <linux/fs.h> /* file_operations */
 #include <linux/kernel.h> /* min */
 #include <linux/module.h>
 #include <linux/printk.h> /* printk */
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
 #include <uapi/linux/stat.h> /* S_IRUSR */
 
 static struct dentry *debugfs_file;

kernel_module/ioctl.c

@@ -19,10 +19,10 @@ Documentation/ioctl/ioctl-number.txt has some info:
 - https://askubuntu.com/questions/54239/problem-with-ioctl-in-a-simple-kernel-module/926675#926675
 */
 
-#include <asm/uaccess.h> /* copy_from_user, copy_to_user */
 #include <linux/debugfs.h>
 #include <linux/module.h>
 #include <linux/printk.h> /* printk */
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
 
 #include "ioctl.h"
 

kernel_module/irq.c

@@ -30,11 +30,11 @@ Then see how clicking the mouse and keyboard affect the interrupts. This will po
 - 12: mouse click and drags
 */
 
-#include <asm/uaccess.h> /* copy_from_user, copy_to_user */
 #include <linux/fs.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
 
 #define NAME "lkmc_character_device"
 #define MAX_IRQS 256

kernel_module/mmap.c

@@ -14,13 +14,13 @@ Related:
 - https://github.com/ikwzm/udmabuf
 */
 
-#include <asm/uaccess.h> /* copy_from_user */
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/kernel.h> /* min */
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/proc_fs.h>
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
 #include <linux/slab.h>
 
 static const char *filename = "lkmc_mmap";
@@ -38,13 +38,14 @@ static void vm_close(struct vm_area_struct *vma)
 }
 
 /* First page access. */
-static int vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+	int (*fault)(struct vm_fault *vmf);
+static int vm_fault(struct vm_fault *vmf)
 {
 	struct page *page;
 	struct mmap_info *info;
 
 	pr_info("vm_fault\n");
-	info = (struct mmap_info *)vma->vm_private_data;
+	info = (struct mmap_info *)vmf->vma->vm_private_data;
 	if (info->data) {
 		page = virt_to_page(info->data);
 		get_page(page);

kernel_module/pci.c

@@ -66,7 +66,6 @@ TODO: does it have any side effects? Set in the edu device at:
 Use setpci, devmem and /sys.
 */
 
-#include <asm/uaccess.h> /* put_user */
 #include <linux/cdev.h> /* cdev_ */
 #include <linux/fs.h>
 #include <linux/init.h>
@@ -74,6 +73,7 @@ Use setpci, devmem and /sys.
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/uaccess.h> /* put_user */
 
 /* https://stackoverflow.com/questions/30190050/what-is-base-address-register-bar-in-pcie/44716618#44716618
  *

kernel_module/pci_min.c

@@ -6,7 +6,6 @@ PCI driver for our minimal pci_min.c QEMU fork device.
 probe already does a mmio write, which generates an IRQ and tests everything.
 */
 
-#include <asm/uaccess.h>
 #include <linux/cdev.h>
 #include <linux/fs.h>
 #include <linux/init.h>
@@ -14,6 +13,7 @@ probe already does a mmio write, which generates an IRQ and tests everything.
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
 
 #define BAR 0
 #define CDEV_NAME "lkmc_hw_pci_min"

kernel_module/poll.c

@@ -6,7 +6,6 @@ Outcome: user echoes jiffies every second.
 https://stackoverflow.com/questions/30035776/how-to-add-poll-function-to-the-kernel-module-code/44645336#44645336
 */
 
-#include <asm/uaccess.h> /* copy_from_user, copy_to_user */
 #include <linux/debugfs.h>
 #include <linux/delay.h> /* usleep_range */
 #include <linux/errno.h> /* EFAULT */
@@ -17,6 +16,7 @@ https://stackoverflow.com/questions/30035776/how-to-add-poll-function-to-the-ker
 #include <linux/module.h>
 #include <linux/poll.h>
 #include <linux/printk.h> /* printk */
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
 #include <linux/wait.h> /* wait_queue_head_t, wait_event_interruptible, wake_up_interruptible  */
 #include <uapi/linux/stat.h> /* S_IRUSR */
 

kernel_module/seq_file.c

@@ -24,7 +24,6 @@ Bibliography:
 - https://stackoverflow.com/questions/25399112/how-to-use-a-seq-file-in-linux-modules
 */
 
-#include <asm/uaccess.h> /* copy_from_user, copy_to_user */
 #include <linux/debugfs.h>
 #include <linux/errno.h> /* EFAULT */
 #include <linux/fs.h>
@@ -32,6 +31,7 @@ Bibliography:
 #include <linux/printk.h> /* pr_info */
 #include <linux/seq_file.h> /* seq_read, seq_lseek, single_release */
 #include <linux/slab.h> /* kmalloc, kfree */
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
 #include <uapi/linux/stat.h> /* S_IRUSR */
 
 static int max = 2;

kernel_module/seq_file_single.c

@@ -8,13 +8,13 @@ This example behaves like a file that contains:
 	cd
 */
 
-#include <asm/uaccess.h> /* copy_from_user, copy_to_user */
 #include <linux/debugfs.h>
 #include <linux/errno.h> /* EFAULT */
 #include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/printk.h> /* pr_info */
 #include <linux/seq_file.h> /* seq_read, seq_lseek, single_release */
+#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
 #include <uapi/linux/stat.h> /* S_IRUSR */
 
 static struct dentry *debugfs_file;