From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753828AbeE3Qbd (ORCPT ); Wed, 30 May 2018 12:31:33 -0400 Received: from smtprelay.synopsys.com ([198.182.37.59]:33132 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753532AbeE3Qb0 (ORCPT ); Wed, 30 May 2018 12:31:26 -0400 Subject: Re: [PATCH] ARC: Explicitly add -mmedium-calls to CFLAGS To: Alexey Brodkin , CC: , Vineet Gupta Newsgroups: gmane.linux.kernel,gmane.linux.kernel.arc References: <20180516150330.31182-1-abrodkin@synopsys.com> From: Vineet Gupta Openpgp: preference=signencrypt Autocrypt: addr=vgupta@synopsys.com; keydata= xsFNBFEffBMBEADIXSn0fEQcM8GPYFZyvBrY8456hGplRnLLFimPi/BBGFA24IR+B/Vh/EFk B5LAyKuPEEbR3WSVB1x7TovwEErPWKmhHFbyugdCKDv7qWVj7pOB+vqycTG3i16eixB69row lDkZ2RQyy1i/wOtHt8Kr69V9aMOIVIlBNjx5vNOjxfOLux3C0SRl1veA8sdkoSACY3McOqJ8 zR8q1mZDRHCfz+aNxgmVIVFN2JY29zBNOeCzNL1b6ndjU73whH/1hd9YMx2Sp149T8MBpkuQ cFYUPYm8Mn0dQ5PHAide+D3iKCHMupX0ux1Y6g7Ym9jhVtxq3OdUI5I5vsED7NgV9c8++baM 7j7ext5v0l8UeulHfj4LglTaJIvwbUrCGgtyS9haKlUHbmey/af1j0sTrGxZs1ky1cTX7yeF nSYs12GRiVZkh/Pf3nRLkjV+kH++ZtR1GZLqwamiYZhAHjo1Vzyl50JT9EuX07/XTyq/Bx6E dcJWr79ZphJ+mR2HrMdvZo3VSpXEgjROpYlD4GKUApFxW6RrZkvMzuR2bqi48FThXKhFXJBd JiTfiO8tpXaHg/yh/V9vNQqdu7KmZIuZ0EdeZHoXe+8lxoNyQPcPSj7LcmE6gONJR8ZqAzyk F5voeRIy005ZmJJ3VOH3Gw6Gz49LVy7Kz72yo1IPHZJNpSV5xwARAQABzS1WaW5lZXQgR3Vw dGEgKHBlcnNvbmFsKSA8dmluZWV0Zzc2QGdtYWlsLmNvbT7CwX4EEwECACgCGwMGCwkIBwMC BhUIAgkKCwQWAgMBAh4BAheABQJbBYpwBQkLx0HcAAoJEGnX8d3iisJe9TAP/3ljkSlRwToH O0E9QimJJqF52uZ0phSg1ZoavgHhGtz1mRykgeOzOITpFmYGBnf3v2Z33fDltIxTaN5TkRwl DjYvz1NTBlTLyPRbYwdCn6YyVSWj75hiGwdD0/N5M7Rb3XYsyDHvZ/tns1oGwipPmu9G+JoB VOkZw/bviE8AmGEK54PWdU1t3AnJ/3wtT6FSIPlTtCREiuZdQItjFkH0sYL1/BOXcE+XoBoQ 9hx6IEb46pop9ix/IRov2y6ZBUtDbF+SOSvImRadvD8A1ttvH51naP21Bra3ypV/GmZOR1/U 8azvgKmimYvC0345za/dS8eqrDuSh2IbEkDR0juQsFbkWS4IY5uqckzRWxHVZBas9CjpjipO C4iTzxq3CgmCyAD5qlQndJdhbsTgN18PXVAAI/phC1BtjNOoCgWgNsr8JK2TbXNF9wSR17T7 jDWCZ+Up8k5CTVQywLwJl91u5dV82WAnHnv3U1dwUX46DFMenV16ADfRrm7ib+D/O0XZMP7B sGC7PPleU+Ej/rt6V4H6VZ5RC9CXVCdUjM+ZZsqJc6/f5od4gSyswWQzCb/izU5ebxrehTUJ lPh2QCa6e46G1WzLWwZCFmQU3uUQtCXU1BBId/nL+Y3hQW0XKapvTx+zr8cZAZDXb83YE8Qs inBoGE5y9nj+ZveaVZHZRy63zsFNBFEffBMBEADXZ2pWw4Regpfw+V+Vr6tvZFRl245PV9rW FU72xNuvZKq/WE3xMu+ZE7l2JKpSjrEoeOHejtT0cILeQ/Yhf2t2xAlrBLlGOMmMYKK/K0Dc 2zf0MiPRbW/NCivMbGRZdhAAMx1bpVhInKjU/6/4mT7gcE57Ep0tl3HBfpxCK8RRlZc3v8BH OaEfcWSQD7QNTZK/kYJo+Oyux+fzyM5TTuKAaVE63NHCgWtFglH2vt2IyJ1XoPkAMueLXay6 enSKNci7qAG2UwicyVDCK9AtEub+ps8NakkeqdSkDRp5tQldJbfDaMXuWxJuPjfSojHIAbFq P6QaANXvTCSuBgkmGZ58skeNopasrJA4z7OsKRUBvAnharU82HGemtIa4Z83zotOGNdaBBOH NN2MHyfGLm+kEoccQheH+my8GtbH1a8eRBtxlk4c02ONkq1Vg1EbIzvgi4a56SrENFx4+4sZ cm8oItShAoKGIE/UCkj/jPlWqOcM/QIqJ2bR8hjBny83ONRf2O9nJuEYw9vZAPFViPwWG8tZ 7J+ReuXKai4DDr+8oFOi/40mIDe/Bat3ftyd+94Z1RxDCngd3Q85bw13t2ttNLw5eHufLIpo EyAhTCLNQ58eT91YGVGvFs39IuH0b8ovVvdkKGInCT59Vr0MtfgcsqpDxWQXJXYZYTFHd3/R swARAQABwsFlBBgBAgAPAhsMBQJbBYpwBQkLx0HdAAoJEGnX8d3iisJewe8P/36pkZrVTfO+ U+Gl1OQh4m6weozuI8Y98/DHLMxEujKAmRzy+zMHYlIl3WgSih1UMOZ7U84yVZQwXQkLItcw XoihChKD5D2BKnZYEOLM+7f9DuJuWhXpee80aNPzEaubBYQ7dYt8rcmB7SdRz/yZq3lALOrF /zb6SRleBh0DiBLP/jKUV74UAYV3OYEDHN9blvhWUEFFE0Z+j96M4/kuRdxvbDmp04Nfx79A mJEnfv1Vvc9CFiWVbBrNPKomIN+JV7a7m2lhbfhlLpUk0zGFDTWcWejl4qz/pCYSoIUU4r/V BsCVZrOun4vd4cSi/yYJRY4kaAJGCL5k7qhflL2tgldUs+wERH8ZCzimWVDBzHTBojz0Ff3w 2+gY6FUbAJBrBZANkymPpdAB/lTsl8D2ZRWyy90f4VVc8LB/QIWY/GiS2towRXQBjHOfkUB1 JiEXYH/i93k71mCaKfzKGXTVxObU2I441w7r4vtNlu0sADRHCMUqHmkpkjV1YbnYPvBPFrDB S1V9OfD9SutXeDjJYe3N+WaLRp3T3x7fYVnkfjQIjDSOdyPWlTzqQv0I3YlUk7KjFrh1rxtr poYSIQKf5HuMowUNtjyiK2VhA5V2XDqd+ZUT3RqfAPf3Y5HjkhKJRqoIDggUKMUKmXaxCkPG i91ThhqBJlyU6MVUa6vZNv8E Message-ID: Date: Wed, 30 May 2018 09:31:11 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180516150330.31182-1-abrodkin@synopsys.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.10.161.79] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/16/2018 08:03 AM, Alexey Brodkin wrote: > GCC built for arc*-*-linux has "-mmedium-calls" implicitly enabled by default > thus we don't see any problems during Linux kernel compilation. > ----------------------------->8------------------------ > arc-linux-gcc -mcpu=arc700 -Q --help=target | grep calls > -mlong-calls [disabled] > -mmedium-calls [enabled] > ----------------------------->8------------------------ > > But if we try to use so-called Elf32 toolchain with GCC configured for > arc*-*-elf* then we'd see the following failure: > ----------------------------->8------------------------ > init/do_mounts.o: In function 'init_rootfs': > do_mounts.c:(.init.text+0x108): relocation truncated to fit: R_ARC_S21W_PCREL > against symbol 'unregister_filesystem' defined in .text section in fs/filesystems.o > > arc-elf32-ld: final link failed: Symbol needs debug section which does not exist > make: *** [vmlinux] Error 1 > ----------------------------->8------------------------ > > That happens because neither "-mmedium-calls" nor "-mlong-calls" are enabled in > Elf32 GCC: > ----------------------------->8------------------------ > arc-elf32-gcc -mcpu=arc700 -Q --help=target | grep calls > -mlong-calls [disabled] > -mmedium-calls [disabled] > ----------------------------->8------------------------ > > Now to make it possible to use Elf32 toolchain for building Linux kernel > we're explicitly add "-mmedium-calls" to CFLAGS. > > Signed-off-by: Alexey Brodkin > --- > arch/arc/Makefile | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arc/Makefile b/arch/arc/Makefile > index d37f49d6a27f..db9ce90c3cc0 100644 > --- a/arch/arc/Makefile > +++ b/arch/arc/Makefile > @@ -16,7 +16,7 @@ endif > > KBUILD_DEFCONFIG := nsim_700_defconfig > > -cflags-y += -fno-common -pipe -fno-builtin -D__linux__ > +cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__ > cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7 > cflags-$(CONFIG_ISA_ARCV2) += -mcpu=archs LGTM. Bbut while we are here, can you now remove -mmedium-calls for specific files further down in the makefile.