From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: Qian Cai <cai@lca.pw>
Cc: ndesaulniers@google.com,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
natechancellor@gmail.com, Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org
Subject: Re: "arm64: vdso: Substitute gettimeofday() with C implementation" breaks clang build
Date: Tue, 25 Jun 2019 14:40:38 +0100 [thread overview]
Message-ID: <00a78980-6b9c-5d5b-ed01-b28bb34be022@arm.com> (raw)
In-Reply-To: <1561467369.5154.67.camel@lca.pw>
Hi Qin,
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?
>>
>> 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
>>
--
Regards,
Vincenzo
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next prev parent reply other threads:[~2019-06-25 13:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-25 12:16 "arm64: vdso: Substitute gettimeofday() with C implementation" breaks clang build Qian Cai
2019-06-25 12:47 ` Vincenzo Frascino
2019-06-25 12:56 ` Qian Cai
2019-06-25 13:40 ` Vincenzo Frascino [this message]
2019-06-25 13:51 ` Qian Cai
2019-06-25 14:11 ` Vincenzo Frascino
2019-06-25 14:28 ` Qian Cai
2019-06-25 14:30 ` Vincenzo Frascino
2019-06-25 14:54 ` Vincenzo Frascino
2019-06-25 15:16 ` Qian Cai
2019-06-25 16:26 ` Nick Desaulniers
2019-06-25 17:00 ` Vincenzo Frascino
2019-06-25 17:31 ` Qian Cai
2019-06-25 17:33 ` Vincenzo Frascino
2019-06-26 9:38 ` Will Deacon
2019-06-26 9:45 ` Vincenzo Frascino
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