Merge tag 'nios2-v4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/lftan/nios2

Pull nios2 updates from Ley Foon Tan:
 "nios2 fixes/enhancements and adding nios2 R2 support"

* tag 'nios2-v4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/lftan/nios2:
  nios2: remove custom early console implementation
  nios2: use generic strncpy_from_user() and strnlen_user()
  nios2: Add CDX support
  nios2: Add BMX support
  nios2: Add NIOS2_ARCH_REVISION to select between R1 and R2
  nios2: implement flush_dcache_mmap_lock/unlock
  nios2: enable earlycon support
  nios2: constify irq_domain_ops
  nios2: remove wrapper header for cmpxchg.h
  nios2: add .gitignore entries for auto-generated files

arch/nios2/include/asm/Kbuild

@@ -6,6 +6,7 @@ generic-y += bitsperlong.h
 generic-y += bug.h
 generic-y += bugs.h
 generic-y += clkdev.h
+generic-y += cmpxchg.h
 generic-y += current.h
 generic-y += device.h
 generic-y += div64.h

arch/nios2/include/asm/cacheflush.h

@@ -46,7 +46,9 @@ extern void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
 extern void flush_dcache_range(unsigned long start, unsigned long end);
 extern void invalidate_dcache_range(unsigned long start, unsigned long end);
 
-#define flush_dcache_mmap_lock(mapping)		do { } while (0)
-#define flush_dcache_mmap_unlock(mapping)	do { } while (0)
+#define flush_dcache_mmap_lock(mapping) \
+	spin_lock_irq(&(mapping)->tree_lock)
+#define flush_dcache_mmap_unlock(mapping) \
+	spin_unlock_irq(&(mapping)->tree_lock)
 
 #endif /* _ASM_NIOS2_CACHEFLUSH_H */

arch/nios2/include/asm/cmpxchg.h

@@ -1,14 +0,0 @@
-/*
- * Copyright (C) 2004 Microtronix Datacom Ltd.
- *
- * 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.
- */
-
-#ifndef _ASM_NIOS2_CMPXCHG_H
-#define _ASM_NIOS2_CMPXCHG_H
-
-#include <asm-generic/cmpxchg.h>
-
-#endif /* _ASM_NIOS2_CMPXCHG_H */

arch/nios2/include/asm/cpuinfo.h

@@ -29,6 +29,8 @@ struct cpuinfo {
 	bool has_div;
 	bool has_mul;
 	bool has_mulx;
+	bool has_bmx;
+	bool has_cdx;
 
 	/* CPU caches */
 	u32 icache_line_size;

arch/nios2/include/asm/prom.h

@@ -1,22 +0,0 @@
-/*
- * Copyright Altera Corporation (C) <2015>. All rights reserved
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef __ASM_NIOS2_PROM_H__
-#define __ASM_NIOS2_PROM_H__
-
-extern unsigned long __init of_early_console(void);
-
-#endif

arch/nios2/include/asm/setup.h

@@ -30,8 +30,6 @@ extern char fast_handler_end[];
 
 extern void pagetable_init(void);
 
-extern void setup_early_printk(void);
-
 #endif/* __KERNEL__ */
 #endif /* __ASSEMBLY__ */
 

arch/nios2/include/asm/uaccess.h

@@ -42,6 +42,8 @@
 
 # define __EX_TABLE_SECTION	".section __ex_table,\"a\"\n"
 
+#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)
+
 /*
  * Zero Userspace
  */
@@ -81,8 +83,9 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n);
 #define INLINE_COPY_TO_USER
 
 extern long strncpy_from_user(char *__to, const char __user *__from,
-				long __len);
-extern long strnlen_user(const char __user *s, long n);
+			      long __len);
+extern __must_check long strlen_user(const char __user *str);
+extern __must_check long strnlen_user(const char __user *s, long n);
 
 /* Optimized macros */
 #define __get_user_asm(val, insn, addr, err)				\