linux-kernel - [PATCH v2 bpf-next 1/5] ftrace: allow customized flags for ftrace_direct_multi ftrace

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Message-ID: <20220602193706.2607681-2-song@kernel.org>
Date:   Thu, 2 Jun 2022 12:37:02 -0700
From:   Song Liu <song@...nel.org>
To:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <kernel-team@...com>, <rostedt@...dmis.org>, <jolsa@...nel.org>,
        <mhiramat@...nel.org>, Song Liu <song@...nel.org>
Subject: [PATCH v2 bpf-next 1/5] ftrace: allow customized flags for ftrace_direct_multi ftrace_ops

This enables users of ftrace_direct_multi to specify the flags based on
the actual use case. For example, some users may not set flag IPMODIFY.

Signed-off-by: Song Liu <song@...nel.org>
---
 kernel/trace/ftrace.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 2fcd17857ff6..afe782ae28d3 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5456,8 +5456,7 @@ int modify_ftrace_direct(unsigned long ip,
 }
 EXPORT_SYMBOL_GPL(modify_ftrace_direct);
 
-#define MULTI_FLAGS (FTRACE_OPS_FL_IPMODIFY | FTRACE_OPS_FL_DIRECT | \
-		     FTRACE_OPS_FL_SAVE_REGS)
+#define MULTI_FLAGS (FTRACE_OPS_FL_DIRECT | FTRACE_OPS_FL_SAVE_REGS)
 
 static int check_direct_multi(struct ftrace_ops *ops)
 {
@@ -5547,7 +5546,7 @@ int register_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr)
 	}
 
 	ops->func = call_direct_funcs;
-	ops->flags = MULTI_FLAGS;
+	ops->flags |= MULTI_FLAGS;
 	ops->trampoline = FTRACE_REGS_ADDR;
 
 	err = register_ftrace_function(ops);
-- 
2.30.2