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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id u7sm11765933qtc.25.2019.06.25.06.51.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Jun 2019 06:51:46 -0700 (PDT) Message-ID: <1561470705.5154.68.camel@lca.pw> Subject: Re: "arm64: vdso: Substitute gettimeofday() with C implementation" breaks clang build From: Qian Cai To: Vincenzo Frascino Date: Tue, 25 Jun 2019 09:51:45 -0400 In-Reply-To: <00a78980-6b9c-5d5b-ed01-b28bb34be022@arm.com> References: <1561464964.5154.63.camel@lca.pw> <1561467369.5154.67.camel@lca.pw> <00a78980-6b9c-5d5b-ed01-b28bb34be022@arm.com> X-Mailer: Evolution 3.22.6 (3.22.6-10.el7) Mime-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190625_065150_026842_0AC061C3 X-CRM114-Status: GOOD ( 16.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ndesaulniers@google.com, Catalin Marinas , Will Deacon , "linux-kernel@vger.kernel.org" , natechancellor@gmail.com, Thomas Gleixner , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCAyMDE5LTA2LTI1IGF0IDE0OjQwICswMTAwLCBWaW5jZW56byBGcmFzY2lubyB3cm90 ZToKPiBPbiAyNS8wNi8yMDE5IDEzOjU2LCBRaWFuIENhaSB3cm90ZToKPiA+IE9uIFR1ZSwgMjAx OS0wNi0yNSBhdCAxMzo0NyArMDEwMCwgVmluY2Vuem8gRnJhc2Npbm8gd3JvdGU6Cj4gPiA+IEhp IFFpYW4sCj4gPiA+IAo+ID4gPiBPbiAyNS8wNi8yMDE5IDEzOjE2LCBRaWFuIENhaSB3cm90ZToK PiA+ID4gPiBUaGUgbGludXgtbmV4dCBjb21taXQgImFybTY0OiB2ZHNvOiBTdWJzdGl0dXRlIGdl dHRpbWVvZmRheSgpIHdpdGggQwo+ID4gPiA+IGltcGxlbWVudGF0aW9uIiBbMV0gYnJlYWtzIGNs YW5nIGJ1aWxkLgo+ID4gPiA+IAo+ID4gPiA+IGVycm9yOiBpbnZhbGlkIHZhbHVlICd0aW55JyBp biAnLW1jb2RlLW1vZGVsIHRpbnknCj4gPiA+ID4gbWFrZVsxXTogKioqIFtzY3JpcHRzL01ha2Vm aWxlLmJ1aWxkOjI3OToKPiA+ID4gPiBhcmNoL2FybTY0L2tlcm5lbC92ZHNvL3ZnZXR0aW1lb2Zk YXkub10gRXJyb3IgMQo+ID4gPiA+IG1ha2VbMV06ICoqKiBXYWl0aW5nIGZvciB1bmZpbmlzaGVk IGpvYnMuLi4uCj4gPiA+ID4gbWFrZTogKioqIFthcmNoL2FybTY0L01ha2VmaWxlOjE4MDogdmRz b19wcmVwYXJlXSBFcnJvciAyCj4gPiA+ID4gCj4gPiA+ID4gWzFdIGh0dHBzOi8vcGF0Y2h3b3Jr Lmtlcm5lbC5vcmcvcGF0Y2gvMTEwMDk2NjMvCj4gPiA+ID4gCj4gPiA+IAo+ID4gPiBJIGFtIG5v dCBzdXJlIHdoYXQgZG9lcyBleGFjdGx5IGJyZWFrIGZyb20geW91ciByZXBvcnQuIENvdWxkIHlv dSBwbGVhc2UKPiA+ID4gcHJvdmlkZQo+ID4gPiBtb3JlIGRldGFpbHM/Cj4gPiAKPiA+IEhlcmUg aXMgdGhlIGNvbmZpZyB0byByZXByb2R1Y2UuCj4gPiAKPiA+IGh0dHBzOi8vcmF3LmdpdGh1YnVz ZXJjb250ZW50LmNvbS9jYWlsY2EvbGludXgtbW0vbWFzdGVyL2FybTY0LmNvbmZpZwo+ID4gCj4g PiAjIG1ha2UgQ0M9Y2xhbmcgLWogJChucl9jcHVzKQo+ID4gCj4gPiBJIGNhbiBnZXQgaXQgd29y a2luZyBhZ2FpbiBieSByZW1vdmluZyAiLW1jbW9kZWw9dGlueSIgaW4KPiA+IGFyY2gvYXJtNjQv a2VybmVsL3Zkc28vTWFrZWZpbGUKPiA+IAo+IAo+IFdpdGggeW91ciBkZWZjb25maWcgSSBjYW4n dCBzdGlsbCByZXByb2R1Y2UgdGhlIHByb2JsZW0uIFdoaWNoIHZlcnNpb24gb2YKPiBjbGFuZwo+ IGFyZSB5b3UgdXNpbmc/CgpDb21waWxlcjogY2xhbmcgdmVyc2lvbiA3LjAuMSAodGFncy9SRUxF QVNFXzcwMS9maW5hbCkKCj4gCj4gPiA+IAo+ID4gPiBPbiBteSBlbnY6Cj4gPiA+IAo+ID4gPiAk IG1ha2UgbXJwcm9wZXIgJiYgbWFrZSBkZWZjb25maWcgJiYgbWFrZSBDQz1jbGFuZyBIT1NUQ0M9 Y2xhbmcgLWokKG5wcm9jKQo+ID4gPiAKPiA+ID4gLi4uCj4gPiA+IAo+ID4gPiBhcmNoL2FybTY0 L01ha2VmaWxlOjU2OiBDUk9TU19DT01QSUxFX0NPTVBBVCBpcyBjbGFuZywgdGhlIGNvbXBhdCB2 RFNPCj4gPiA+IHdpbGwKPiA+ID4gbm90Cj4gPiA+IGJlIGJ1aWx0Cj4gPiA+IAo+ID4gPiAuLi4K PiA+ID4gCj4gPiA+IMKgIExEU8KgwqDCoMKgwqBhcmNoL2FybTY0L2tlcm5lbC92ZHNvL3Zkc28u bGRzCj4gPiA+IMKgIEFTwqDCoMKgwqDCoMKgYXJjaC9hcm02NC9rZXJuZWwvdmRzby9ub3RlLm8K PiA+ID4gwqAgQVPCoMKgwqDCoMKgwqBhcmNoL2FybTY0L2tlcm5lbC92ZHNvL3NpZ3JldHVybi5v Cj4gPiA+IMKgIENDwqDCoMKgwqDCoMKgYXJjaC9hcm02NC9rZXJuZWwvdmRzby92Z2V0dGltZW9m ZGF5Lm8KPiA+ID4gwqAgTETCoMKgwqDCoMKgwqBhcmNoL2FybTY0L2tlcm5lbC92ZHNvL3Zkc28u c28uZGJnCj4gPiA+IMKgIFZEU09DSEsgYXJjaC9hcm02NC9rZXJuZWwvdmRzby92ZHNvLnNvLmRi Zwo+ID4gPiDCoCBWRFNPU1lNIGluY2x1ZGUvZ2VuZXJhdGVkL3Zkc28tb2Zmc2V0cy5oCj4gPiA+ IAo+ID4gPiAuLi4KPiA+ID4gCj4gPiA+IMKgIExEwqDCoMKgwqDCoMKgdm1saW51eC5vCj4gPiA+ IMKgIE1PRFBPU1Qgdm1saW51eC5vCj4gPiA+IMKgIE1PRElORk8gbW9kdWxlcy5idWlsdGluLm1v ZGluZm8KPiA+ID4gwqAgS1NZTcKgwqDCoMKgLnRtcF9rYWxsc3ltczEubwo+ID4gPiDCoCBLU1lN wqDCoMKgwqAudG1wX2thbGxzeW1zMi5vCj4gPiA+IMKgIExEwqDCoMKgwqDCoMKgdm1saW51eAo+ ID4gPiDCoCBTT1JURVjCoMKgdm1saW51eAo+ID4gPiDCoCBTWVNNQVDCoMKgU3lzdGVtLm1hcAo+ ID4gPiDCoCBCdWlsZGluZyBtb2R1bGVzLCBzdGFnZSAyLgo+ID4gPiDCoCBPQkpDT1BZIGFyY2gv YXJtNjQvYm9vdC9JbWFnZQo+ID4gPiDCoCBNT0RQT1NUIDQ4MyBtb2R1bGVzCj4gPiA+IAo+IAo+ IAoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgt YXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQu b3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJt LWtlcm5lbAo= From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0C1FEC48BD5 for ; 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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id u7sm11765933qtc.25.2019.06.25.06.51.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Jun 2019 06:51:46 -0700 (PDT) Message-ID: <1561470705.5154.68.camel@lca.pw> Subject: Re: "arm64: vdso: Substitute gettimeofday() with C implementation" breaks clang build From: Qian Cai To: Vincenzo Frascino Cc: Thomas Gleixner , Will Deacon , Catalin Marinas , linux-arm-kernel@lists.infradead.org, "linux-kernel@vger.kernel.org" , natechancellor@gmail.com, ndesaulniers@google.com Date: Tue, 25 Jun 2019 09:51:45 -0400 In-Reply-To: <00a78980-6b9c-5d5b-ed01-b28bb34be022@arm.com> References: <1561464964.5154.63.camel@lca.pw> <1561467369.5154.67.camel@lca.pw> <00a78980-6b9c-5d5b-ed01-b28bb34be022@arm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.6 (3.22.6-10.el7) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2019-06-25 at 14:40 +0100, Vincenzo Frascino wrote: > On 25/06/2019 13:56, Qian Cai wrote: > > On Tue, 2019-06-25 at 13:47 +0100, Vincenzo Frascino wrote: > > > Hi Qian, > > > > > > On 25/06/2019 13:16, Qian Cai wrote: > > > > The linux-next commit "arm64: vdso: Substitute gettimeofday() with C > > > > implementation" [1] breaks clang build. > > > > > > > > error: invalid value 'tiny' in '-mcode-model tiny' > > > > make[1]: *** [scripts/Makefile.build:279: > > > > arch/arm64/kernel/vdso/vgettimeofday.o] Error 1 > > > > make[1]: *** Waiting for unfinished jobs.... > > > > make: *** [arch/arm64/Makefile:180: vdso_prepare] Error 2 > > > > > > > > [1] https://patchwork.kernel.org/patch/11009663/ > > > > > > > > > > I am not sure what does exactly break from your report. Could you please > > > provide > > > more details? > > > > Here is the config to reproduce. > > > > https://raw.githubusercontent.com/cailca/linux-mm/master/arm64.config > > > > # make CC=clang -j $(nr_cpus) > > > > I can get it working again by removing "-mcmodel=tiny" in > > arch/arm64/kernel/vdso/Makefile > > > > With your defconfig I can't still reproduce the problem. Which version of > clang > are you using? Compiler: clang version 7.0.1 (tags/RELEASE_701/final) > > > > > > > On my env: > > > > > > $ make mrproper && make defconfig && make CC=clang HOSTCC=clang -j$(nproc) > > > > > > ... > > > > > > arch/arm64/Makefile:56: CROSS_COMPILE_COMPAT is clang, the compat vDSO > > > will > > > not > > > be built > > > > > > ... > > > > > >   LDS     arch/arm64/kernel/vdso/vdso.lds > > >   AS      arch/arm64/kernel/vdso/note.o > > >   AS      arch/arm64/kernel/vdso/sigreturn.o > > >   CC      arch/arm64/kernel/vdso/vgettimeofday.o > > >   LD      arch/arm64/kernel/vdso/vdso.so.dbg > > >   VDSOCHK arch/arm64/kernel/vdso/vdso.so.dbg > > >   VDSOSYM include/generated/vdso-offsets.h > > > > > > ... > > > > > >   LD      vmlinux.o > > >   MODPOST vmlinux.o > > >   MODINFO modules.builtin.modinfo > > >   KSYM    .tmp_kallsyms1.o > > >   KSYM    .tmp_kallsyms2.o > > >   LD      vmlinux > > >   SORTEX  vmlinux > > >   SYSMAP  System.map > > >   Building modules, stage 2. > > >   OBJCOPY arch/arm64/boot/Image > > >   MODPOST 483 modules > > > > >