linux-kernel - [for-linus][PATCH 3/3] kprobes: Fix compiler warning for !CONFIG_KPROBES_ON

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Message-ID: <20200806131132.126327427@goodmis.org>
Date:   Thu, 06 Aug 2020 09:11:11 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Muchun Song <songmuchun@...edance.com>
Subject: [for-linus][PATCH 3/3] kprobes: Fix compiler warning for !CONFIG_KPROBES_ON_FTRACE

From: Muchun Song <songmuchun@...edance.com>

Fix compiler warning(as show below) for !CONFIG_KPROBES_ON_FTRACE.

kernel/kprobes.c: In function 'kill_kprobe':
kernel/kprobes.c:1116:33: warning: statement with no effect
[-Wunused-value]
 1116 | #define disarm_kprobe_ftrace(p) (-ENODEV)
      |                                 ^
kernel/kprobes.c:2154:3: note: in expansion of macro
'disarm_kprobe_ftrace'
 2154 |   disarm_kprobe_ftrace(p);

Link: https://lore.kernel.org/r/20200805142136.0331f7ea@canb.auug.org.au
Link: https://lkml.kernel.org/r/20200805172046.19066-1-songmuchun@bytedance.com

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Fixes: 0cb2f1372baa ("kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler")
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Muchun Song <songmuchun@...edance.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 kernel/kprobes.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 07bf03fcf574..66d14107968d 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1079,9 +1079,20 @@ static int disarm_kprobe_ftrace(struct kprobe *p)
 		ipmodify ? &kprobe_ipmodify_enabled : &kprobe_ftrace_enabled);
 }
 #else	/* !CONFIG_KPROBES_ON_FTRACE */
-#define prepare_kprobe(p)	arch_prepare_kprobe(p)
-#define arm_kprobe_ftrace(p)	(-ENODEV)
-#define disarm_kprobe_ftrace(p)	(-ENODEV)
+static inline int prepare_kprobe(struct kprobe *p)
+{
+	return arch_prepare_kprobe(p);
+}
+
+static inline int arm_kprobe_ftrace(struct kprobe *p)
+{
+	return -ENODEV;
+}
+
+static inline int disarm_kprobe_ftrace(struct kprobe *p)
+{
+	return -ENODEV;
+}
 #endif
 
 /* Arm a kprobe with text_mutex */
-- 
2.26.2