avr32: remove support for AVR32 architecture

This patch drops support for AVR32 architecture from the Linux kernel.

The AVR32 architecture is not keeping up with the development of the
kernel, and since it shares so much of the drivers with Atmel ARM SoC,
it is starting to hinder these drivers to develop swiftly.

Also, all AVR32 AP7 SoC processors are end of lifed from Atmel (now
Microchip).

Finally, the GCC toolchain is stuck at version 4.2.x, and has not
received any patches since the last release from Atmel;
4.2.4-atmel.1.1.3.avr32linux.1. When building kernel v4.10, this
toolchain is no longer able to properly link the network stack.

Haavard and I have came to the conclusion that we feel keeping AVR32 on
life support offers more obstacles for Atmel ARMs, than it gives joy to
AVR32 users. I also suspect there are very few AVR32 users left today,
if anybody at all.

Signed-off-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Signed-off-by: Håvard Skinnemoen <hskinnemoen@gmail.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>

1 files changed, 0 insertions, 56 deletions

diff --git a/arch/avr32/kernel/stacktrace.c b/arch/avr32/kernel/stacktrace.c
deleted file mode 100644
index f8cc995cf0e0..000000000000
--- a/arch/avr32/kernel/stacktrace.c
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Stack trace management functions
- *
- * Copyright (C) 2007 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/sched.h>
-#include <linux/sched/task_stack.h>
-#include <linux/stacktrace.h>
-#include <linux/thread_info.h>
-#include <linux/module.h>
-
-register unsigned long current_frame_pointer asm("r7");
-
-struct stackframe {
-	unsigned long lr;
-	unsigned long fp;
-};
-
-/*
- * Save stack-backtrace addresses into a stack_trace buffer.
- */
-void save_stack_trace(struct stack_trace *trace)
-{
-	unsigned long low, high;
-	unsigned long fp;
-	struct stackframe *frame;
-	int skip = trace->skip;
-
-	low = (unsigned long)task_stack_page(current);
-	high = low + THREAD_SIZE;
-	fp = current_frame_pointer;
-
-	while (fp >= low && fp <= (high - 8)) {
-		frame = (struct stackframe *)fp;
-
-		if (skip) {
-			skip--;
-		} else {
-			trace->entries[trace->nr_entries++] = frame->lr;
-			if (trace->nr_entries >= trace->max_entries)
-				break;
-		}
-
-		/*
-		 * The next frame must be at a higher address than the
-		 * current frame.
-		 */
-		low = fp + 8;
-		fp = frame->fp;
-	}
-}
-EXPORT_SYMBOL_GPL(save_stack_trace);