nds32: Remove the architecture

The nds32 architecture, also known as AndeStar V3, is a custom 32-bit
RISC target designed by Andes Technologies. Support was added to the
kernel in 2016 as the replacement RISC-V based V5 processors were
already announced, and maintained by (current or former) Andes
employees.

As explained by Alan Kao, new customers are now all using RISC-V,
and all known nds32 users are already on longterm stable kernels
provided by Andes, with no development work going into mainline
support any more.

While the port is still in a reasonably good shape, it only gets
worse over time without active maintainers, so it seems best
to remove it before it becomes unusable. As always, if it turns
out that there are mainline users after all, and they volunteer
to maintain the port in the future, the removal can be reverted.

Link: https://lore.kernel.org/linux-mm/YhdWNLUhk+x9RAzU@yamatobi.andestech.com/
Link: https://lore.kernel.org/lkml/20220302065213.82702-1-alankao@andestech.com/
Link: https://www.andestech.com/en/products-solutions/andestar-architecture/
Signed-off-by: Alan Kao <alankao@andestech.com>
[arnd: rewrite changelog to provide more background]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

3 files changed, 0 insertions, 31 deletions

diff --git a/tools/perf/arch/nds32/Build b/tools/perf/arch/nds32/Build
deleted file mode 100644
index e4e5f33c84d8..000000000000
--- a/tools/perf/arch/nds32/Build
+++ /dev/null
@@ -1 +0,0 @@
-perf-y += util/
diff --git a/tools/perf/arch/nds32/util/Build b/tools/perf/arch/nds32/util/Build
deleted file mode 100644
index d0bc205fe49a..000000000000
--- a/tools/perf/arch/nds32/util/Build
+++ /dev/null
@@ -1 +0,0 @@
-perf-y += header.o
diff --git a/tools/perf/arch/nds32/util/header.c b/tools/perf/arch/nds32/util/header.c
deleted file mode 100644
index ef9dbdbe7968..000000000000
--- a/tools/perf/arch/nds32/util/header.c
+++ /dev/null
@@ -1,29 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2005-2017 Andes Technology Corporation
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <api/fs/fs.h>
-#include "header.h"
-
-#define STR_LEN 1024
-
-char *get_cpuid_str(struct perf_pmu *pmu)
-{
-	/* In nds32, we only have one cpu */
-	char *buf = NULL;
-	struct cpu_map *cpus;
-	const char *sysfs = sysfs__mountpoint();
-
-	if (!sysfs || !pmu || !pmu->cpus)
-		return NULL;
-
-	buf = malloc(STR_LEN);
-	if (!buf)
-		return NULL;
-
-	cpus = cpu_map__get(pmu->cpus);
-	sprintf(buf, "0x%x", cpus->nr - 1);
-	cpu_map__put(cpus);
-	return buf;
-}