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Subject: Re: [PATCH] ia64: enable HAVE_COPY_THREAD_TLS, switch to
 kernel_clone_args
To:     Christian Brauner <christian.brauner@ubuntu.com>
Cc:     "Luck, Tony" <tony.luck@intel.com>,
        "Yu, Fenghua" <fenghua.yu@intel.com>,
        "linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Arnd Bergmann <arnd@arndb.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Qais Yousef <qais.yousef@arm.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <3908561D78D1C84285E8C5FCA982C28F7F6266E0@ORSMSX115.amr.corp.intel.com>
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 <20200514103259.tdfjc5ds4igpmoxj@wittgenstein>
From:   John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
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Message-ID: <666503de-d8f9-b19c-6924-ab80d36cd446@physik.fu-berlin.de>
Date:   Thu, 14 May 2020 12:35:49 +0200
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 5/14/20 12:32 PM, Christian Brauner wrote:
> Do you have a very minimalistic ia64 userspace preferably without systemd where
> you could simply test. That should give us an idea whether things work:
> 
> #define _GNU_SOURCE
> #include <sys/wait.h>
> #include <sys/utsname.h>
> #include <sched.h>
> #include <string.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <sys/mman.h>
> 
> #define STACK_SIZE (8 * 1024 * 1024) /* standard stack size for threads in glibc */
> 
> int main(int argc, char *argv[])
> {
> 	char *stack;
>         pid_t pid;
> 
> 	stack = mmap(NULL, STACK_SIZE, PROT_READ | PROT_WRITE,
> 		     MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
> 	if (stack == MAP_FAILED)
> 		exit(EXIT_FAILURE);
> 
>         /* 
> 	 * Note that legacy clone() has different argument ordering on
>          * different architectures so this won't work everywhere.
>          */
>         pid = syscall(189 /* __NR_clone2 */, SIGCHLD, stack, STACK_SIZE, NULL, NULL);
>         if (pid < 0)
>                 exit(EXIT_FAILURE);
>         if (pid == 0)
>                 exit(EXIT_SUCCESS);
>         if (wait(NULL) != pid)
>                 exit(EXIT_FAILURE);
> 
>         exit(EXIT_SUCCESS);
> }

root@titanium:~# gcc systemd_test.c -o systemd_test
root@titanium:~# ./systemd_test
root@titanium:~# echo $?
1
root@titanium:~#

I can also give you access to this machine.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913