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

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Message-ID: <20171020085722.n422sxot6k7kipjy@gmail.com>
Date:   Fri, 20 Oct 2017 10:57:22 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Masami Hiramatsu <mhiramat@...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: Re: [RFC PATCH -tip 1/5] kprobes: Use ENOTSUPP instead of ENOSYS


* Masami Hiramatsu <mhiramat@...nel.org> wrote:

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

Is this actually true? We use -ENOSYS in a ton of code in kernel/ already, not 
just for non-existing syscall number.

	Ingo