+++ /dev/null
---- /dev/null
-+++ b/include/linux/crashlog.h
-@@ -0,0 +1,17 @@
-+#ifndef __CRASHLOG_H
-+#define __CRASHLOG_H
-+
-+#ifdef CONFIG_CRASHLOG
-+void crashlog_init_bootmem(struct bootmem_data *bdata);
-+void crashlog_init_memblock(phys_addr_t addr, phys_addr_t size);
-+#else
-+static inline void crashlog_init_bootmem(struct bootmem_data *bdata)
-+{
-+}
-+
-+static inline void crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
-+{
-+}
-+#endif
-+
-+#endif
---- a/init/Kconfig
-+++ b/init/Kconfig
-@@ -926,6 +926,10 @@ config RELAY
-
- If unsure, say N.
-
-+config CRASHLOG
-+ bool "Crash logging"
-+ depends on (!NO_BOOTMEM || HAVE_MEMBLOCK) && !(ARM || SPARC || PPC)
-+
- config BLK_DEV_INITRD
- bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
- depends on BROKEN || !FRV
---- a/kernel/Makefile
-+++ b/kernel/Makefile
-@@ -107,6 +107,7 @@ obj-$(CONFIG_USER_RETURN_NOTIFIER) += us
- obj-$(CONFIG_PADATA) += padata.o
- obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
- obj-$(CONFIG_JUMP_LABEL) += jump_label.o
-+obj-$(CONFIG_CRASHLOG) += crashlog.o
-
- $(obj)/configs.o: $(obj)/config_data.h
-
---- /dev/null
-+++ b/kernel/crashlog.c
-@@ -0,0 +1,190 @@
-+/*
-+ * Crash information logger
-+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
-+ *
-+ * Based on ramoops.c
-+ * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
-+ *
-+ * 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.
-+ *
-+ * This program is distributed in the hope that 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, write to the Free Software
-+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
-+ * 02110-1301 USA
-+ *
-+ */
-+
-+#include <linux/module.h>
-+#include <linux/bootmem.h>
-+#include <linux/memblock.h>
-+#include <linux/debugfs.h>
-+#include <linux/crashlog.h>
-+#include <linux/kmsg_dump.h>
-+#include <linux/module.h>
-+#include <linux/pfn.h>
-+#include <asm/io.h>
-+
-+#define CRASHLOG_PAGES 4
-+#define CRASHLOG_SIZE (CRASHLOG_PAGES * PAGE_SIZE)
-+#define CRASHLOG_MAGIC 0xa1eedead
-+
-+/*
-+ * Start the log at 1M before the end of RAM, as some boot loaders like
-+ * to use the end of the RAM for stack usage and other things
-+ * If this fails, fall back to using the last part.
-+ */
-+#define CRASHLOG_OFFSET (1024 * 1024)
-+
-+struct crashlog_data {
-+ u32 magic;
-+ u32 len;
-+ u8 data[];
-+};
-+
-+static struct debugfs_blob_wrapper crashlog_blob;
-+static unsigned long crashlog_addr = 0;
-+static struct crashlog_data *crashlog_buf;
-+static struct kmsg_dumper dump;
-+static bool first = true;
-+
-+extern struct list_head *crashlog_modules;
-+
-+#ifndef CONFIG_NO_BOOTMEM
-+void __init crashlog_init_bootmem(bootmem_data_t *bdata)
-+{
-+ unsigned long addr;
-+
-+ if (crashlog_addr)
-+ return;
-+
-+ addr = PFN_PHYS(bdata->node_low_pfn) - CRASHLOG_OFFSET;
-+ if (reserve_bootmem(addr, CRASHLOG_SIZE, BOOTMEM_EXCLUSIVE) < 0) {
-+ printk("Crashlog failed to allocate RAM at address 0x%lx\n", addr);
-+ bdata->node_low_pfn -= CRASHLOG_PAGES;
-+ addr = PFN_PHYS(bdata->node_low_pfn);
-+ }
-+ crashlog_addr = addr;
-+}
-+#endif
-+
-+#ifdef CONFIG_HAVE_MEMBLOCK
-+void __meminit crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
-+{
-+ if (crashlog_addr)
-+ return;
-+
-+ addr += size - CRASHLOG_OFFSET;
-+ if (memblock_reserve(addr, CRASHLOG_SIZE)) {
-+ printk("Crashlog failed to allocate RAM at address 0x%lx\n", (unsigned long) addr);
-+ return;
-+ }
-+
-+ crashlog_addr = addr;
-+}
-+#endif
-+
-+static void __init crashlog_copy(void)
-+{
-+ if (crashlog_buf->magic != CRASHLOG_MAGIC)
-+ return;
-+
-+ if (!crashlog_buf->len || crashlog_buf->len >
-+ CRASHLOG_SIZE - sizeof(*crashlog_buf))
-+ return;
-+
-+ crashlog_blob.size = crashlog_buf->len;
-+ crashlog_blob.data = kmemdup(crashlog_buf->data,
-+ crashlog_buf->len, GFP_KERNEL);
-+
-+ debugfs_create_blob("crashlog", 0700, NULL, &crashlog_blob);
-+}
-+
-+static int get_maxlen(void)
-+{
-+ return CRASHLOG_SIZE - sizeof(*crashlog_buf) - crashlog_buf->len;
-+}
-+
-+static void crashlog_printf(const char *fmt, ...)
-+{
-+ va_list args;
-+ int len = get_maxlen();
-+
-+ if (!len)
-+ return;
-+
-+ va_start(args, fmt);
-+ crashlog_buf->len += vscnprintf(
-+ &crashlog_buf->data[crashlog_buf->len],
-+ len, fmt, args);
-+ va_end(args);
-+}
-+
-+static void crashlog_do_dump(struct kmsg_dumper *dumper,
-+ enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
-+ const char *s2, unsigned long l2)
-+{
-+ unsigned long s1_start, s2_start;
-+ unsigned long l1_cpy, l2_cpy;
-+ struct timeval tv;
-+ struct module *m;
-+ char *buf;
-+ int len;
-+
-+ if (!first)
-+ crashlog_printf("\n===================================\n");
-+
-+ do_gettimeofday(&tv);
-+ crashlog_printf("Time: %lu.%lu\n",
-+ (long)tv.tv_sec, (long)tv.tv_usec);
-+
-+ if (first) {
-+ crashlog_printf("Modules:");
-+ list_for_each_entry(m, crashlog_modules, list) {
-+ crashlog_printf("\t%s@%p+%x", m->name,
-+ m->module_core, m->core_size,
-+ m->module_init, m->init_size);
-+ }
-+ crashlog_printf("\n");
-+ first = false;
-+ }
-+
-+ buf = (char *)&crashlog_buf->data[crashlog_buf->len];
-+ len = get_maxlen();
-+
-+ l2_cpy = min(l2, (unsigned long)len);
-+ l1_cpy = min(l1, (unsigned long)len - l2_cpy);
-+
-+ s2_start = l2 - l2_cpy;
-+ s1_start = l1 - l1_cpy;
-+
-+ memcpy(buf, s1 + s1_start, l1_cpy);
-+ memcpy(buf + l1_cpy, s2 + s2_start, l2_cpy);
-+ crashlog_buf->len += l1_cpy + l2_cpy;
-+}
-+
-+
-+int __init crashlog_init_fs(void)
-+{
-+ if (!crashlog_addr)
-+ return -ENOMEM;
-+
-+ crashlog_buf = ioremap(crashlog_addr, CRASHLOG_SIZE);
-+
-+ crashlog_copy();
-+
-+ crashlog_buf->magic = CRASHLOG_MAGIC;
-+ crashlog_buf->len = 0;
-+
-+ dump.dump = crashlog_do_dump;
-+ kmsg_dump_register(&dump);
-+
-+ return 0;
-+}
-+module_init(crashlog_init_fs);
---- a/mm/bootmem.c
-+++ b/mm/bootmem.c
-@@ -15,6 +15,7 @@
- #include <linux/export.h>
- #include <linux/kmemleak.h>
- #include <linux/range.h>
-+#include <linux/crashlog.h>
- #include <linux/memblock.h>
-
- #include <asm/bug.h>
-@@ -177,6 +178,7 @@ static unsigned long __init free_all_boo
- if (!bdata->node_bootmem_map)
- return 0;
-
-+ crashlog_init_bootmem(bdata);
- start = bdata->node_min_pfn;
- end = bdata->node_low_pfn;
-
---- a/kernel/module.c
-+++ b/kernel/module.c
-@@ -101,6 +101,9 @@ static LIST_HEAD(modules);
- #ifdef CONFIG_KGDB_KDB
- struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
- #endif /* CONFIG_KGDB_KDB */
-+#ifdef CONFIG_CRASHLOG
-+struct list_head *crashlog_modules = &modules;
-+#endif
-
-
- /* Block module loading/unloading? */
---- a/mm/memblock.c
-+++ b/mm/memblock.c
-@@ -19,6 +19,7 @@
- #include <linux/debugfs.h>
- #include <linux/seq_file.h>
- #include <linux/memblock.h>
-+#include <linux/crashlog.h>
-
- static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
- static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
-@@ -305,6 +306,8 @@ static void __init_memblock memblock_ins
- memblock_set_region_node(rgn, nid);
- type->cnt++;
- type->total_size += size;
-+ if (type == &memblock.memory && idx == 0)
-+ crashlog_init_memblock(base, size);
- }
-
- /**
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