Re: [musl] Re: [GIT PULL] asm-generic changes for 5.19

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Hi Ard,

On 6/2/22 00:01, Ard Biesheuvel wrote:
On Wed, 1 Jun 2022 at 09:41, Arnd Bergmann <arnd@xxxxxxxxxx> wrote:
On Wed, Jun 1, 2022 at 7:52 AM WANG Xuerui <kernel@xxxxxxxxxx> wrote:
On 6/1/22 00:01, Huacai Chen wrote:
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/log/?h=loongarch-next
has been updated. Now this branch droped irqchip drivers and pci
drivers. But the existing irqchip drivers need some small adjustment
to avoid build errors [1], and I hope Marc can give an Acked-by.
Thanks.

This branch can be built with defconfig and allmodconfig (except
drivers/platform/surface/aggregator/controller.c, because it requires
8bit/16bit cmpxchg, which I was told to remove their support).

[1] https://lore.kernel.org/lkml/e7cf33a170d0b4e98e53744f60dbf922@xxxxxxxxxx/T/#t
I see the loongarch-next HEAD has been updated and it's now purely arch
changes aside from the two trivial irqchip cleanups. Some other changes
to the v11 patchset [1] are included, but arguably minor enough to not
invalidate previous Reviewed-by tags.
Very nice! I don't see exactly how the previous build bugs were addressed,
but I can confirm that this version builds. Regarding the two irqchip patches,
621e7015b529 ("irqchip/loongson-liointc: Fix build error for LoongArch") is
a good way to work around the mips oddity, and I have no problem taking
that through the asm-generic tree. The other one, f54b4a166023 ("irqchip:
  Adjust Kconfig for Loongson"), looks mostly unnecessary, and I think only
the LOONGSON_HTPIC change should be included here, while I would
leave out the COMPILE_TEST changes and instead have the driver
changes take care of making it possible to keep building it on x86, possibly
doing

         depends on MACH_LOONGSON64 || (COMPILE_TEST && ACPI)

in the future, after the loongarch64 ACPI support is merged.

After some small tweaks:

- adding "#include <asm/irqflags.h>" to arch/loongarch/include/asm/ptrace.h,
- adding an arch/loongarch/include/uapi/asm/bpf_perf_event.h with the
same content as arch/arm64's, and
- adding "depends on ARM64 || X86" to
drivers/platform/surface/aggregator/Kconfig,

the current loongarch-next HEAD (commit
36552a24f70d21b7d63d9ef490561dbdc13798d7) now passes allmodconfig build
(with CONFIG_WERROR disabled; my Gentoo-flavored gcc-12 seems to emit
warnings on a few drivers).
The only one of these issues that I see is the surface aggregator one.
I think we can address all three as follow-up fixes after -rc1 if the port
gets merged and these are still required.

The majority of userspace ABI has been stable for a few months already,
after the addition of orig_a0 and removal of newfstatat; the necessary
changes to switch to statx are already reviewed [2] / merged [3], and
have been integrated into the LoongArch port of Gentoo for a while. Eric
looked at the v11 and gave comments, and changes were made according to
the suggestions, but it'd probably better to get a proper Reviewed-by.
Right.

Among the rest of patches, I think maybe the EFI/boot protocol part
still need approval/ack from the EFI maintainer. However because the
current port isn't going to be able to run on any real hardware, maybe
that part could be done later; I'm not sure if the unacknowledged EFI
bits should be removed as well.
Ard, do you have any last comments on this?

It would be nice if the questions I raised against the previous
revision (v11) were addressed (or at least answered) first. In
general, I think this is feeling a bit rushed and IMHO we should
probably defer this to the next cycle.

Actually I think Huacai did reply to your review on v11: https://lore.kernel.org/all/CAAhV-H7KAg8RxN7M=WiOOh0fDhEKTyqrwp6V-SC0cyR0iMrdeg@xxxxxxxxxxxxxx/. It's a bit unfortunate that he probably didn't justify some of the approaches enough, and it's especially unfortunate that some of the points (like maybe the kernel version string in the EFI stub header) are result of their internal discussion, which I presume to be especially hard to change due to their particularly worrying corporate dynamics...

But again, my point is that the userspace ABI in particular is *not* rushed -- it has been brewing since v1 of the port which is already several months ago, and multiple distro-building efforts are already underway. We (LoongArch distro packagers) want to freeze the userspace ABI so that many downstream efforts wouldn't be blocked by the merging of kernel port.

As the boot protocol is technically not part of the userspace ABI that toolchains care about, and we already know it'll be a rather standards-compliant UEFI implementation even if this part gets dropped for brewing one more cycle, would taking this part out work for you?




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