linux-kernel - [RFC PATCH -tip 1/5] kprobes: Use ENOTSUPP instead of ENOSYS

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Date:   Fri,  6 Oct 2017 08:13:56 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        Ian McDonald <ian.mcdonald@...di.co.nz>,
        Vlad Yasevich <vyasevich@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: [RFC PATCH -tip 1/5] kprobes: Use ENOTSUPP instead of ENOSYS

Use ENOTSUPP instead of ENOSYS because ENOSYS is reserved
only for invalid syscall number.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 include/linux/kprobes.h |   16 ++++++++--------
 kernel/kprobes.c        |    4 ++--
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index bd2684700b74..39d558ec71c6 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -431,11 +431,11 @@ static inline struct kprobe *kprobe_running(void)
 }
 static inline int register_kprobe(struct kprobe *p)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 static inline int register_kprobes(struct kprobe **kps, int num)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 static inline void unregister_kprobe(struct kprobe *p)
 {
@@ -445,11 +445,11 @@ static inline void unregister_kprobes(struct kprobe **kps, int num)
 }
 static inline int register_jprobe(struct jprobe *p)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 static inline int register_jprobes(struct jprobe **jps, int num)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 static inline void unregister_jprobe(struct jprobe *p)
 {
@@ -462,11 +462,11 @@ static inline void jprobe_return(void)
 }
 static inline int register_kretprobe(struct kretprobe *rp)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 static inline int register_kretprobes(struct kretprobe **rps, int num)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 static inline void unregister_kretprobe(struct kretprobe *rp)
 {
@@ -479,11 +479,11 @@ static inline void kprobe_flush_task(struct task_struct *tk)
 }
 static inline int disable_kprobe(struct kprobe *kp)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 static inline int enable_kprobe(struct kprobe *kp)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 #endif /* CONFIG_KPROBES */
 static inline int disable_kretprobe(struct kretprobe *rp)
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 2d28377a0e32..5e977d3b712a 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -2021,13 +2021,13 @@ EXPORT_SYMBOL_GPL(unregister_kretprobes);
 #else /* CONFIG_KRETPROBES */
 int register_kretprobe(struct kretprobe *rp)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 EXPORT_SYMBOL_GPL(register_kretprobe);
 
 int register_kretprobes(struct kretprobe **rps, int num)
 {
-	return -ENOSYS;
+	return -ENOTSUPP;
 }
 EXPORT_SYMBOL_GPL(register_kretprobes);