From 9d56ec6244e516fd80f8500aaa081c39ffeccf86 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 11 Aug 2016 17:02:32 +0200
Subject: kernel: fix crashlog issues on highmem systems
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
.../linux/generic/patches-4.4/930-crashlog.patch | 51 ++++++++++++++--------
1 file changed, 32 insertions(+), 19 deletions(-)
(limited to 'target/linux/generic/patches-4.4/930-crashlog.patch')
diff --git a/target/linux/generic/patches-4.4/930-crashlog.patch b/target/linux/generic/patches-4.4/930-crashlog.patch
index 311a4f1159..bb97c90196 100644
--- a/target/linux/generic/patches-4.4/930-crashlog.patch
+++ b/target/linux/generic/patches-4.4/930-crashlog.patch
@@ -43,7 +43,7 @@
--- /dev/null
+++ b/kernel/crashlog.c
-@@ -0,0 +1,196 @@
+@@ -0,0 +1,209 @@
+/*
+ * Crash information logger
+ * Copyright (C) 2010 Felix Fietkau <nbd@nbd.name>
@@ -103,40 +103,53 @@
+
+extern struct list_head *crashlog_modules;
+
++static bool crashlog_set_addr(phys_addr_t addr, phys_addr_t size)
++{
++ /* Limit to lower 64 MB to avoid highmem */
++ phys_addr_t limit = 64 * 1024 * 1024;
++
++ if (crashlog_addr)
++ return false;
++
++ if (addr > limit)
++ return false;
++
++ if (addr + size > limit)
++ size = limit - addr;
++
++ crashlog_addr = addr + size - CRASHLOG_OFFSET;
++ return true;
++}
++
+#ifndef CONFIG_NO_BOOTMEM
+void __init crashlog_init_bootmem(bootmem_data_t *bdata)
+{
-+ unsigned long addr;
++ phys_addr_t start, end;
+
-+ if (crashlog_addr)
++ start = PFN_PHYS(bdata->node_low_pfn);
++ end = PFN_PHYS(bdata->node_min_pfn);
++ if (!crashlog_set_addr(start, end - start))
+ 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);
++ if (reserve_bootmem(crashlog_addr, CRASHLOG_SIZE, BOOTMEM_EXCLUSIVE) < 0) {
++ printk("Crashlog failed to allocate RAM at address 0x%lx\n",
++ crashlog_addr);
++ crashlog_addr = 0;
+ }
-+ crashlog_addr = addr;
+}
+#endif
+
+#ifdef CONFIG_HAVE_MEMBLOCK
+void __init_memblock crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
+{
-+ if (crashlog_addr)
++ if (!crashlog_set_addr(addr, size))
+ return;
+
-+ if (size <= CRASHLOG_OFFSET + CRASHLOG_SIZE)
-+ 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;
++ if (memblock_reserve(crashlog_addr, CRASHLOG_SIZE)) {
++ printk("Crashlog failed to allocate RAM at address 0x%lx\n",
++ crashlog_addr);
++ crashlog_addr = 0;
+ }
-+
-+ crashlog_addr = addr;
+}
+#endif
+
--
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