X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=kernel%2Ffail_function.c;h=1d5632d8bbccfd941a6b0b1cf0ac380c4aeb0a5c;hb=e15f20ea33b8e5074145abe464b4b48acea505d9;hp=21b0122cb39cb1c8f45976566e3b4f675d50450c;hpb=0bd2afc74808389591894dd7c7c83952006a1283;p=mirror_ubuntu-eoan-kernel.git

diff --git a/kernel/fail_function.c b/kernel/fail_function.c
index 21b0122cb39c..1d5632d8bbcc 100644
--- a/kernel/fail_function.c
+++ b/kernel/fail_function.c
@@ -14,6 +14,15 @@
 
 static int fei_kprobe_handler(struct kprobe *kp, struct pt_regs *regs);
 
+static void fei_post_handler(struct kprobe *kp, struct pt_regs *regs,
+			     unsigned long flags)
+{
+	/*
+	 * A dummy post handler is required to prohibit optimizing, because
+	 * jump optimization does not support execution path overriding.
+	 */
+}
+
 struct fei_attr {
 	struct list_head list;
 	struct kprobe kp;
@@ -56,6 +65,7 @@ static struct fei_attr *fei_attr_new(const char *sym, unsigned long addr)
 			return NULL;
 		}
 		attr->kp.pre_handler = fei_kprobe_handler;
+		attr->kp.post_handler = fei_post_handler;
 		attr->retval = adjust_error_retval(addr, 0);
 		INIT_LIST_HEAD(&attr->list);
 	}