linux-kernel - [PATCH 3/3] livepatch: Use FTRACE_OPS_FL

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Message-Id: <20191007081714.20259-4-mbenes@suse.cz>
Date:   Mon,  7 Oct 2019 10:17:14 +0200
From:   Miroslav Benes <mbenes@...e.cz>
To:     rostedt@...dmis.org, mingo@...hat.com, jpoimboe@...hat.com,
        jikos@...nel.org, pmladek@...e.com, joe.lawrence@...hat.com
Cc:     linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        Miroslav Benes <mbenes@...e.cz>
Subject: [PATCH 3/3] livepatch: Use FTRACE_OPS_FL_PERMANENT

Use FTRACE_OPS_FL_PERMANENT flag to be immune to toggling the
'ftrace_enabled' sysctl knob.

Signed-off-by: Miroslav Benes <mbenes@...e.cz>
---
 kernel/livepatch/patch.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c
index bd43537702bd..b552cf2d85f8 100644
--- a/kernel/livepatch/patch.c
+++ b/kernel/livepatch/patch.c
@@ -196,7 +196,8 @@ static int klp_patch_func(struct klp_func *func)
 		ops->fops.func = klp_ftrace_handler;
 		ops->fops.flags = FTRACE_OPS_FL_SAVE_REGS |
 				  FTRACE_OPS_FL_DYNAMIC |
-				  FTRACE_OPS_FL_IPMODIFY;
+				  FTRACE_OPS_FL_IPMODIFY |
+				  FTRACE_OPS_FL_PERMANENT;
 
 		list_add(&ops->node, &klp_ops);
 
-- 
2.23.0