Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/powerpc/lib/error-inject.c b/arch/powerpc/lib/error-inject.c
new file mode 100644
index 0000000..407b992
--- /dev/null
+++ b/arch/powerpc/lib/error-inject.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/error-injection.h>
+#include <linux/kprobes.h>
+#include <linux/uaccess.h>
+
+void override_function_with_return(struct pt_regs *regs)
+{
+ /*
+ * Emulate 'blr'. 'regs' represents the state on entry of a predefined
+ * function in the kernel/module, captured on a kprobe. We don't need
+ * to worry about 32-bit userspace on a 64-bit kernel.
+ */
+ regs->nip = regs->link;
+}
+NOKPROBE_SYMBOL(override_function_with_return);