linux-kernel - Re: how can we test the hexagon port in mainline

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Message-ID: <CAK8P3a2bG64ARjpwQ0ZhQ9P0g8B-=AwcHHAbYBXBS4B6Fy9pQw@mail.gmail.com>
Date:   Wed, 23 Jun 2021 17:35:38 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Brian Cain <bcain@...eaurora.org>,
        Sid Manning <sidneym@...eaurora.org>,
        "open list:QUALCOMM HEXAGON..." <linux-hexagon@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: how can we test the hexagon port in mainline

On Wed, Jun 23, 2021 at 5:17 PM Christoph Hellwig <hch@....de> wrote:
>
> It seem like it still isn't complete enought for a kernel build, though:
>
> $ export CROSS_COMPILE=/opt/clang+llvm-12.0.0-cross-hexagon-unknown-linux-musl/x86_64-linux-gnu/bin/hexagon-unknown-linux-musl-
> $ make ARCH=hexagon LLVM=1 oldconfig
> ...
> scripts/Kconfig.include:40: linker 'ld.lld' not found

I tried this using the prebuilt binaries from apt.llvm.org:

$ make ARCH=hexagon LLVM=1 O=obj-hexagon CROSS_COMPILE=hexagon-linux-
LLVM_IAS=1 CC=llvm-12 defconfig modules vmlinux
<stdin>:1515:2: warning: syscall clone3 not implemented [-W#warnings]
#warning syscall clone3 not implemented
 ^
1 warning generated.

Doing the same thing with allmodconfig results in an internal error
with clang-12
while compiling kernel/locking/lockdep.c. Same thing with clang-13.
After turning
off lock debugging, it seems fine.

       Arnd