Re: next/master bisection: baseline.login on rk3288-rock2-square

On 04/02/2021 18:23, Nick Desaulniers wrote:

On Thu, Feb 4, 2021 at 10:12 AM Nathan Chancellor [off-list ref] wrote:

quoted

On Thu, Feb 04, 2021 at 10:06:08AM -0800, 'Nick Desaulniers' via Clang Built Linux wrote:

quoted

On Thu, Feb 4, 2021 at 8:02 AM Ard Biesheuvel [off-list ref] wrote:

quoted

On Thu, 4 Feb 2021 at 16:53, Guillaume Tucker
[off-list ref] wrote:

quoted

On 04/02/2021 15:42, Ard Biesheuvel wrote:

quoted

On Thu, 4 Feb 2021 at 12:32, Guillaume Tucker
[off-list ref] wrote:

quoted

Essentially:

  make -j18 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- LLVM=1 CC="ccache clang" zImage

This command should link with BFD (and assemble with GAS; it's only
using clang as the compiler.

I think you missed the 'LLVM=1' before CC="ccache clang". That should
use all of the LLVM utilities minus the integrated assembler while
wrapping clang with ccache.

You're right, I missed `LLVM=1`. Adding `LD=ld.bfd` I think should
permit fallback to BFD.

That was close, except we're cross-compiling with GCC for arm.
So I've now built a plain next-20210203 (without Ard's fix) using
this command line:

    make LD=arm-linux-gnueabihf-ld.bfd -j18 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- LLVM=1 CC="ccache clang" zImage

I'm using a modified Docker image gtucker/kernelci-build-clang-11
with the very latest LLVM 11 and gcc-8-arm-linux-gnueabihf
packages added to be able to use the GNU linker.  BTW I guess we
should enable this kind of hybrid build setup on kernelci.org as
well.

Full build log + kernel binaries can be found here:

    https://storage.staging.kernelci.org/gtucker/next-20210203-ard-fix/v5.10-rc4-24722-g58b6c0e507b7-gtucker_single-staging-41/arm/multi_v7_defconfig/clang-11/

And this booted fine, which confirms it's really down to how
ld.lld puts together the kernel image.  Does it actually solve
the debate whether this is an issue to fix in the assembly code
or at link time?

Full test job details for the record:

    https://lava.collabora.co.uk/scheduler/job/3176004

Hope that helps,
Guillaume

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