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Thu, 14 May 2020 12:21:15 +0200 Received: from p5b13a426.dip0.t-ipconnect.de ([91.19.164.38] helo=[192.168.178.139]) by inpost2.zedat.fu-berlin.de (Exim 4.93) with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (envelope-from ) id 1jZAzK-002Q9f-QX; Thu, 14 May 2020 12:21:14 +0200 Subject: Re: [PATCH] ia64: enable HAVE_COPY_THREAD_TLS, switch to kernel_clone_args To: Christian Brauner Cc: "Luck, Tony" , "Yu, Fenghua" , "linux-ia64@vger.kernel.org" , Al Viro , Arnd Bergmann , Thomas Gleixner , Ingo Molnar , Sebastian Andrzej Siewior , "Peter Zijlstra (Intel)" , Qais Yousef , "linux-kernel@vger.kernel.org" References: <20200513204848.1208864-1-christian.brauner@ubuntu.com> <3908561D78D1C84285E8C5FCA982C28F7F6266E0@ORSMSX115.amr.corp.intel.com> <79e58d9b-5a39-390c-2f0c-0d87b63442b4@physik.fu-berlin.de> <20200514074606.vkc35syhdep23rzh@wittgenstein> <6b298416-1e64-eee7-0bb4-3b1f7f67adc6@physik.fu-berlin.de> <20200514100459.pt7dxq2faghdds2c@wittgenstein> <2e22b0d2-b9ce-420d-48a0-0d9134108a5c@physik.fu-berlin.de> <20200514101540.25hvle74w63t66fs@wittgenstein> <20200514101914.fu7xhgaxtb5fy2ky@wittgenstein> From: John Paul Adrian Glaubitz Autocrypt: addr=glaubitz@physik.fu-berlin.de; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200514101914.fu7xhgaxtb5fy2ky@wittgenstein> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Original-Sender: glaubitz@physik.fu-berlin.de X-Originating-IP: 91.19.164.38 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/14/20 12:19 PM, Christian Brauner wrote: > Scratch that. It's even worse. On ia64 it is _invalid_ to pass a NULL > stack. That's at least what the glibc assembly assumes: > > cmp.eq p6,p0=0,in0 > cmp.eq p7,p0=0,in1 > mov r8=EINVAL > mov out0=in3 /* Flags are first syscall argument. */ > mov out1=in1 /* Stack address. */ > (p6) br.cond.spnt.many __syscall_error /* no NULL function pointers */ > (p7) br.cond.spnt.many __syscall_error /* no NULL stack pointers */ > ;; > mov out2=in2 /* Stack size. */ > > so newer systemd just works by accident on ia64 if at all correctly > afaict. Hmm, interesting. I really wasn't aware of that. Thanks for the heads-up. I'll ask Michael whether he can come up for a solution for that problem. Maybe that's also why systemd crashes. 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