summaryrefslogtreecommitdiffstats
path: root/arch/mips/kernel/crash_dump.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/kernel/crash_dump.c')
-rw-r--r--arch/mips/kernel/crash_dump.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/mips/kernel/crash_dump.c b/arch/mips/kernel/crash_dump.c
new file mode 100644
index 000000000..6e50f4902
--- /dev/null
+++ b/arch/mips/kernel/crash_dump.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/highmem.h>
+#include <linux/crash_dump.h>
+#include <linux/uio.h>
+
+ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
+ size_t csize, unsigned long offset)
+{
+ void *vaddr;
+
+ if (!csize)
+ return 0;
+
+ vaddr = kmap_local_pfn(pfn);
+ csize = copy_to_iter(vaddr + offset, csize, iter);
+ kunmap_local(vaddr);
+
+ return csize;
+}