1 files changed, 36 insertions, 0 deletions

diff --git a/arch/um/kernel/checksum.c b/arch/um/kernel/checksum.c
new file mode 100644
index 000000000000..e69b2be951d1
--- /dev/null
+++ b/arch/um/kernel/checksum.c
@@ -0,0 +1,36 @@
+#include "asm/uaccess.h"
+#include "linux/errno.h"
+#include "linux/module.h"
+
+unsigned int arch_csum_partial(const unsigned char *buff, int len, int sum);
+
+unsigned int csum_partial(unsigned char *buff, int len, int sum)
+{
+        return arch_csum_partial(buff, len, sum);
+}
+
+EXPORT_SYMBOL(csum_partial);
+
+unsigned int csum_partial_copy_to(const unsigned char *src,
+                                  unsigned char __user *dst, int len, int sum,
+                                  int *err_ptr)
+{
+        if(copy_to_user(dst, src, len)){
+                *err_ptr = -EFAULT;
+                return(-1);
+        }
+
+        return(arch_csum_partial(src, len, sum));
+}
+
+unsigned int csum_partial_copy_from(const unsigned char __user *src,
+                                    unsigned char *dst, int len, int sum,
+                                    int *err_ptr)
+{
+        if(copy_from_user(dst, src, len)){
+                *err_ptr = -EFAULT;
+                return(-1);
+        }
+
+        return arch_csum_partial(dst, len, sum);
+}