linux-kernel - Re: [PATCH 2/4] selftests/ptrace: add test cases for dead-locks

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Date:   Wed, 11 Mar 2020 01:41:01 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Bernd Edlinger <bernd.edlinger@...mail.de>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Oleg Nesterov <oleg@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Andrei Vagin <avagin@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Yuyang Du <duyuyang@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        David Howells <dhowells@...hat.com>,
        James Morris <jamorris@...ux.microsoft.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian Kellner <christian@...lner.me>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Aleksa Sarai <cyphar@...har.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH 2/4] selftests/ptrace: add test cases for dead-locks

On Tue, Mar 10, 2020 at 02:44:01PM +0100, Bernd Edlinger wrote:
> This adds test cases for ptrace deadlocks.
> 
> Additionally fixes a compile problem in get_syscall_info.c,
> observed with gcc-4.8.4:
> 
> get_syscall_info.c: In function 'get_syscall_info':
> get_syscall_info.c:93:3: error: 'for' loop initial declarations are only
>                                  allowed in C99 mode
>    for (unsigned int i = 0; i < ARRAY_SIZE(args); ++i) {
>    ^
> get_syscall_info.c:93:3: note: use option -std=c99 or -std=gnu99 to compile
>                                your code
[...]
> @@ -1,6 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -CFLAGS += -iquote../../../../include/uapi -Wall
> +CFLAGS += -std=c99 -pthread -iquote../../../../include/uapi -Wall

Wouldn't it be better to choose -std=gnu99 over -std=c99?


-- 
ldv