linux_riscv: Move patches to my Linux fork.

All patches there are also submitted upstream and will be removed if
rejected.

Also includes some fixes to get module loading working.

pkgs/os-specific/linux/kernel/linux-riscv.nix

···
 { stdenv, buildPackages, hostPlatform, fetchFromGitHub, perl, buildLinux, libelf, utillinux, ... } @ args:
 
 buildLinux (args // rec {
-  version = "4.16-rc1";
-  modDirVersion = "4.16.0-rc1";
+  version = "4.16-rc2";
+  modDirVersion = "4.16.0-rc2";
   extraMeta.branch = "4.16";
 
   src = fetchFromGitHub {
-    owner = "riscv";
+    owner = "shlevy";
     repo ="riscv-linux";
-    rev = "a31991a9c6ce2c86fd676cf458a0ec10edc20d37";
-    sha256 = "0n97wfbi3pnp5c70xfj7s0fk8zjjkjz6ldxh7n54kbf64l4in01f";
+    rev = "f0c42cff9292c0a8e6ca702a54aafa04b35758a6";
+    sha256 = "050mdciyz1595z81zsss0v9vqsaysppyzqaqpfs5figackifv3iv";
   };
 
   # Should the testing kernels ever be built on Hydra?

pkgs/os-specific/linux/kernel/patches.nix

···
     };
   };
 
-  riscv_modules = {
-    name = "riscv-modules";
-    patch = ./riscv-modules.patch;
-  };
-
-  # http://lists.infradead.org/pipermail/linux-riscv/2018-February/000054.html
-  riscv_irq_busy = {
-    name = "riscv-irq-busy";
-    patch = ./riscv-irq-busy.patch;
-  };
-
-  # http://lists.infradead.org/pipermail/linux-riscv/2018-February/000059.html
-  riscv_install = {
-    name = "riscv-install";
-    patch = ./riscv-install.patch;
-  };
-
-  # http://lists.infradead.org/pipermail/linux-riscv/2018-February/000056.html
-  riscv_initrd = {
-    name = "riscv-initrd";
-    patch = ./riscv-initrd.patch;
-  };
-
-  # http://lists.infradead.org/pipermail/linux-riscv/2018-February/000058.html
-  riscv_initrd_free = {
-    name = "riscv-initrd-free";
-    patch = ./riscv-initrd-free.patch;
-  };
-
 }

pkgs/os-specific/linux/kernel/riscv-initrd-free.patch

···
-commit b1fbec8b74ace263ce1371e6bcfdd1dd71b52070
-Author: Shea Levy <[e-mail]>
-Date:   Tue Feb 20 08:48:12 2018 -0500
-
-    riscv: Implement free_initrd_mem.
-    
-    v2: Remove incorrect page alignment.
-    
-    Signed-off-by: Shea Levy <[e-mail]>
-
-diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
-index c77df8142be2..1b6daa5184e0 100644
---- a/arch/riscv/mm/init.c
-+++ b/arch/riscv/mm/init.c
-@@ -66,5 +66,6 @@ void free_initmem(void)
- #ifdef CONFIG_BLK_DEV_INITRD
- void free_initrd_mem(unsigned long start, unsigned long end)
- {
-+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
- }
- #endif /* CONFIG_BLK_DEV_INITRD */

pkgs/os-specific/linux/kernel/riscv-initrd.patch

···
-commit 1e5f6473492f41355289d022003a049ebf8995fa
-Author: Shea Levy <[e-mail]>
-Date:   Tue Feb 20 07:52:14 2018 -0500
-
-    riscv: Respect the initrd found in the dt, if any.
-    
-    Signed-off-by: Shea Levy <[e-mail]>
-
-diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
-index 41d34008faf6..c4ebc907af34 100644
---- a/arch/riscv/kernel/setup.c
-+++ b/arch/riscv/kernel/setup.c
-@@ -88,15 +88,20 @@ static void __init setup_initrd(void)
- 	extern unsigned long __initramfs_size;
- 	unsigned long size;
- 
-+	if (initrd_start)
-+		goto found;
-+
- 	if (__initramfs_size > 0) {
- 		initrd_start = (unsigned long)(&__initramfs_start);
- 		initrd_end = initrd_start + __initramfs_size;
- 	}
- 
-+	initrd_below_start_ok = 1;
- 	if (initrd_start >= initrd_end) {
- 		printk(KERN_INFO "initrd not found or empty");
- 		goto disable;
- 	}
-+found:
- 	if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
- 		printk(KERN_ERR "initrd extends beyond end of memory");
- 		goto disable;
-@@ -104,13 +109,13 @@ static void __init setup_initrd(void)
- 
- 	size =  initrd_end - initrd_start;
- 	memblock_reserve(__pa(initrd_start), size);
--	initrd_below_start_ok = 1;
- 
- 	printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
- 		(void *)(initrd_start), size);
- 	return;
- disable:
- 	pr_cont(" - disabling initrd\n");
-+	initrd_below_start_ok = 0;
- 	initrd_start = 0;
- 	initrd_end = 0;
- }

pkgs/os-specific/linux/kernel/riscv-install.patch

···
-commit 365fc1312f4911bfae25c5914c398f9aca21948f
-Author: Shea Levy <[e-mail]>
-Date:   Mon Feb 19 10:50:58 2018 -0500
-
-    riscv: Add install target to Makefile.
-    
-    Signed-off-by: Shea Levy <[e-mail]>
-
-diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
-index 6719dd30ec5b..26892daefa05 100644
---- a/arch/riscv/Makefile
-+++ b/arch/riscv/Makefile
-@@ -70,3 +70,7 @@ core-y += arch/riscv/kernel/ arch/riscv/mm/
- libs-y += arch/riscv/lib/
- 
- all: vmlinux
-+
-+PHONY += install
-+install: vmlinux
-+	sh $(srctree)/arch/riscv/install.sh $(KERNELRELEASE) $< System.map "$(INSTALL_PATH)"
-diff --git a/arch/riscv/install.sh b/arch/riscv/install.sh
-new file mode 100644
-index 000000000000..8b3155a11a4a
---- /dev/null
-+++ b/arch/riscv/install.sh
-@@ -0,0 +1,39 @@
-+#!/bin/sh
-+#
-+# arch/riscv/install.sh
-+#
-+# This file is subject to the terms and conditions of the GNU General Public
-+# License.  See the file "COPYING" in the main directory of this archive
-+# for more details.
-+#
-+# Copyright (C) 1995 by Linus Torvalds
-+#
-+# Adapted from code in arch/ia64/Makefile by Shea Levy
-+#
-+# "make install" script for riscv architecture
-+#
-+# Arguments:
-+#   $1 - kernel version
-+#   $2 - kernel image file
-+#   $3 - kernel map file
-+#   $4 - default install path (blank if root directory)
-+#
-+
-+# User may have a custom install script
-+
-+if [ -x ~/bin/${INSTALLKERNEL} ]; then exec ~/bin/${INSTALLKERNEL} "$@"; fi
-+if [ -x /sbin/${INSTALLKERNEL} ]; then exec /sbin/${INSTALLKERNEL} "$@"; fi
-+
-+# Default install - no bootloader configuration (yet?)
-+base=$(basename $2)
-+
-+if [ -f $4/$base ]; then
-+	mv $4/$base $4/$base.old
-+fi
-+
-+if [ -f $4/System.map ]; then
-+	mv $4/System.map $4/System.old
-+fi
-+
-+cat $2 > $4/$base
-+cp $3 $4/System.map

pkgs/os-specific/linux/kernel/riscv-irq-busy.patch

···
-commit 2603e6087b26e9428b806b267aee6bcb919abcea
-Author: Shea Levy <[e-mail]>
-Date:   Sun Feb 18 20:08:30 2018 -0500
-
-    set_handle_irq: Return EBUSY if the handler has already been registered.
-    
-    This is what's expected by the comments and at least by irq-riscv-intc.c
-    
-    Signed-off-by: Shea Levy <[e-mail]>
-
-diff --git a/include/linux/irq.h b/include/linux/irq.h
-index 2930fd2572e4..77e97872a13e 100644
---- a/include/linux/irq.h
-+++ b/include/linux/irq.h
-@@ -1179,7 +1179,7 @@ int ipi_send_mask(unsigned int virq, const struct cpumask *dest);
-  * Returns 0 on success, or -EBUSY if an IRQ handler has already been
-  * registered.
-  */
--void __init set_handle_irq(void (*handle_irq)(struct pt_regs *));
-+int __init set_handle_irq(void (*handle_irq)(struct pt_regs *));
- 
- /*
-  * Allows interrupt handlers to find the irqchip that's been registered as the
-diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
-index dee4f9a172ca..3570c715c3e7 100644
---- a/kernel/irq/handle.c
-+++ b/kernel/irq/handle.c
-@@ -213,11 +213,12 @@ irqreturn_t handle_irq_event(struct irq_desc *desc)
- }
- 
- #ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
--void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
-+int __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
- {
- 	if (handle_arch_irq)
--		return;
-+		return -EBUSY;
- 
- 	handle_arch_irq = handle_irq;
-+	return 0;
- }
- #endif

pkgs/os-specific/linux/kernel/riscv-modules.patch

···
-diff -Naur linux-4.15.4-orig/arch/riscv/configs/defconfig linux-4.15.4/arch/riscv/configs/defconfig
---- linux-4.15.4-orig/arch/riscv/configs/defconfig	2018-02-16 14:07:01.000000000 -0500
-+++ linux-4.15.4/arch/riscv/configs/defconfig	2018-02-18 18:33:09.488431900 -0500
-@@ -12,6 +12,7 @@
- CONFIG_NAMESPACES=y
- CONFIG_USER_NS=y
- CONFIG_BLK_DEV_INITRD=y
-+CONFIG_MODULES=y
- CONFIG_EXPERT=y
- CONFIG_CHECKPOINT_RESTORE=y
- CONFIG_BPF_SYSCALL=y

pkgs/top-level/all-packages.nix

···
     kernelPatches = [
       kernelPatches.bridge_stp_helper
       kernelPatches.modinst_arg_list_too_long
-    ] ++ lib.optionals hostPlatform.isRiscV [
-      kernelPatches.riscv_modules
-      kernelPatches.riscv_irq_busy
-      kernelPatches.riscv_install
-      kernelPatches.riscv_initrd
-      kernelPatches.riscv_initrd_free
-   ];
+    ];
   };
 
   linux_samus_4_12 = callPackage ../os-specific/linux/kernel/linux-samus-4.12.nix {
···
         # when adding a new linux version
         kernelPatches.cpu-cgroup-v2."4.11"
         kernelPatches.modinst_arg_list_too_long
-    ];
+      ];
   };
 
   /* Linux kernel modules are inherently tied to a specific kernel.  So