When booted with initramfs, percpu crash_notes ends up in memory that is not accessible by crashkernel
Signed-off-by: Prem Mallappa <pmallappa@xxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/crash_dump.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/mips/kernel/crash_dump.c b/arch/mips/kernel/crash_dump.c
index 3be9e7b..f9886437 100644
--- a/arch/mips/kernel/crash_dump.c
+++ b/arch/mips/kernel/crash_dump.c
@@ -3,6 +3,8 @@
#include <linux/crash_dump.h>
#include <asm/uaccess.h>
#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/io.h>
static int __init parse_savemaxmem(char *p)
{
@@ -13,7 +15,6 @@ static int __init parse_savemaxmem(char *p)
}
__setup("savemaxmem=", parse_savemaxmem);
-
static void *kdump_buf_page;
/**
@@ -41,19 +42,20 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
if (!csize)
return 0;
- vaddr = kmap_atomic_pfn(pfn);
+ vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
if (!userbuf) {
memcpy(buf, (vaddr + offset), csize);
- kunmap_atomic(vaddr);
+ iounmap(vaddr);
} else {
if (!kdump_buf_page) {
pr_warning("Kdump: Kdump buffer page not allocated\n");
return -EFAULT;
}
+
copy_page(kdump_buf_page, vaddr);
- kunmap_atomic(vaddr);
+ iounmap(vaddr);
if (copy_to_user(buf, (kdump_buf_page + offset), csize))
return -EFAULT;
}
--
1.8.4
