From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752318AbeBBQVg (ORCPT ); Fri, 2 Feb 2018 11:21:36 -0500 Received: from mout.kundenserver.de ([212.227.17.13]:51339 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751711AbeBBQVW (ORCPT ); Fri, 2 Feb 2018 11:21:22 -0500 From: Arnd Bergmann To: Andi Kleen Cc: Nicolas Pitre , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, Arnd Bergmann Subject: [PATCH 3/7] [HACK] x86: crypto: fix link error with LTO Date: Fri, 2 Feb 2018 17:21:00 +0100 Message-Id: <20180202162104.2300532-3-arnd@arndb.de> X-Mailer: git-send-email 2.9.0 In-Reply-To: <20180202161550.2106846-1-arnd@arndb.de> References: <20180202161550.2106846-1-arnd@arndb.de> X-Provags-ID: V03:K0:/4xB8qLKWRsQKS6zFXtOIoVYJOhfhv/XMhjjv3mV7IpzLd2Amsp DRXC8eRUisLpqAR1g38LRi2XbAdnCRUuBzpyO1w/wV+z5f8zxr0OX3FCJJ/tkcGUzK6xsjP 1XYem71gFR08CjBfcOHX/+8YxoDb9vGsQ7sU/0tY2ClEHLlzbs3pSiSXObJfqHR6jUrp2Fk 6aJAaDrQr0CT6yF1EnJrA== X-UI-Out-Filterresults: notjunk:1;V01:K0:Uy4Kgz9iaYM=:FYA3RK/NLHdVC+0osIkE4a jPUeN7QhWD/Ztn1SoyP7tmuYD31Oje1A80SZ3/q4RG/RfmwDijE7xQWIkvZlxrsLFZbq2E2kA A3KGAjEWxEy4vB/3YOgDyvwkgHGxa8O8CBcxgem8O+4/RQ9UuOC+DEOKTXy/v+nwGpMzuv9vH Wd4QrqSArEMl3MLr6JGglUX4zupEs+sNGRC062hR6EHF+T7ix1Xk66CXo0iwPtM1XXj3xzr+i Y4FudgJcOrxSdnhXrNSahme13E+5S0FyjGqkSdnQhFo4NdycfhqTxKq0Q0LSmrTk4aWmy4SN8 hn8NzxuHicmWHMY3+HfwGMws2CRrSjRbGg/bKSXGYx42iLEYzNlahLsgpueVH4TZjQ/EM92Rp n3m+q3by5VOUQMoGsS8YLftEMUzqpYtNim9ilBeAPwgWyVy+e9GPGcO7yMR6pM3OQJVICUvnV xax4+dMfd61SFe6OSY9pOQjPhtoBDI5oRBninsk81PmluSkWr+YRzFCenQ8S6itmvX2WVepXd u93qnwFMOwZg0SIE0hUwUKnjBOgxzHQAlMMTmRxixYJxW0TIVpe1m9gq/ppJj8V/TaBoEsATG gZOd14nkQytgzrxYePmVXnLO8fHKoWY1+gRFiQw8RjVnx/m2/uCScKAkvq1onmLhn3eJeB//S txHEIfy9ym/PsPK+X6eA2riLHGDNRT5OvvFnbM3s4dioGC3mD/8eJCXSrze/w5ZZuf0N3WJDN 1EmU+mRAAi9LBQr9FN6UGFA2rUQRSTgJ5oGFgw== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org crypto_it_tab and the other symbols like it are defined in crypto/aes_generic.c and exported for loadable modules. When building with LTO and CONFIG_TRIM_UNUSED_KSYMS, the exports are eliminated, since kbuild fails to take the users in the arch/x86/crypto/aes-i586-asm_32.S assembler file into account. This adds an ugly workaround by adding a reference to each symbol into aes_glue.c, which gets linked together with the assembler file. We obviously want to fix the CONFIG_TRIM_UNUSED_KSYMS logic to do the right thing here instead, but I couldn't come up with a good fix, so I use this instead to get a clean build for testing. This fix only works most of the time, but I still ran into some cases where combining an .S with a .c file did not produce the correct .ko file, as the lto linker apparently did not expect that kind of input. 'nm' on the file after 'ld -r' showed only the contents of the assembler file, and after the lto-ld stage, only the contents of the .c file are there. Signed-off-by: Arnd Bergmann --- arch/x86/crypto/aes_glue.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/crypto/aes_glue.c b/arch/x86/crypto/aes_glue.c index e26984f7ab8d..6da3e3c34a77 100644 --- a/arch/x86/crypto/aes_glue.c +++ b/arch/x86/crypto/aes_glue.c @@ -53,6 +53,11 @@ static struct crypto_alg aes_alg = { static int __init aes_init(void) { + /* ugly hack to force a link time dependency */ + if (&crypto_it_tab == &crypto_ft_tab || + &crypto_fl_tab == &crypto_il_tab) + return 0; + return crypto_register_alg(&aes_alg); } -- 2.9.0