lkmc v2-rc

Unsquashed version at v2-rc-unsquashed, but that cannot be merged as it
breaks bisects at several points. All bugs will not bisect to this
humongous change.

It all started with a conversion of the Bash scripts to Python, mainly
because I couldn't stand not being able to properly use --options for
run which has a million options.

Then since that required a full testing, I decided to do all the
refactorings that I had in mind at once, and so I did and it became
v2-rc.

This is the largest patch I have ever done! OMG a few weeks of extra time.
I'm never writing a Bash script for anything that starts getting big again.

Some of the features are:

* separate build-qemu and build-gem5 commands
* common: convert scripts to python. Add --option for everything
* rename build to build-buildroot now that we are splitting all the build
  commands, Linux kernel to follow
* move all git submodules to submodules/ and all buildroot packages to
  packages/
* refactor the out/ structure. Keep projects on toplevel, because guest
  projects separate archs and host ones don't, making a toplevel arch wrong
* do-release: rename to just release
  https://stackoverflow.com/questions/16174992/cant-get-argparse-to-read-quoted-string-with-dashes-in-it
* run: add --terminal and explain gem5 pdb
* just track the lvimrc
* store CLI kernel config fragment inside buildlroot to avoid conflicts
* gem5: document m5 initparam
* readme: make a bunch of things awesomer
* readme: fix broken refs
* parsec-benchmark: update to 75d55ac446a43c47efb1044844a108c6c330184c
  Could not fetch otherwise.
* gem5: M5_OVERRIDE_PY_SOURCE

packages/kernel_modules/anonymous_inode.c

@@ -0,0 +1,78 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#anonymous-inode */
+
+#include <linux/anon_inodes.h>
+#include <linux/debugfs.h>
+#include <linux/errno.h> /* EFAULT */
+#include <linux/fs.h>
+#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"
+
+static struct dentry *debugfs_file;
+static u32 myval = 1;
+
+static ssize_t read(struct file *filp, char __user *buf, size_t len, loff_t *off)
+{
+	char kbuf[9];
+	size_t ret;
+
+	ret = snprintf(kbuf, sizeof(kbuf), "%x", myval);
+	if (copy_to_user(buf, kbuf, ret)) {
+		ret = -EFAULT;
+	}
+	myval <<= 4;
+	if (myval == 0) {
+		myval = 1;
+	}
+	return ret;
+}
+
+static const struct file_operations fops_anon = {
+	.read = read,
+};
+
+static long unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long argp)
+{
+	int fd;
+
+	switch (cmd) {
+		case LKMC_ANONYMOUS_INODE_GET_FD:
+			fd = anon_inode_getfd(
+				"todo_what_is_this_for",
+				&fops_anon,
+				NULL,
+				O_RDONLY | O_CLOEXEC
+			);
+			if (copy_to_user((void __user *)argp, &fd, sizeof(fd))) {
+				return -EFAULT;
+			}
+		break;
+		default:
+			return -EINVAL;
+		break;
+	}
+	return 0;
+}
+
+static const struct file_operations fops_ioctl = {
+	.owner = THIS_MODULE,
+	.unlocked_ioctl = unlocked_ioctl
+};
+
+static int myinit(void)
+{
+	debugfs_file = debugfs_create_file("lkmc_anonymous_inode", 0, NULL, NULL, &fops_ioctl);
+	return 0;
+}
+
+static void myexit(void)
+{
+	debugfs_remove(debugfs_file);
+}
+
+module_init(myinit)
+module_exit(myexit)
+MODULE_LICENSE("GPL");