linux-kernel - Re: arch/arm64/include/asm/atomic_ll_sc.h:298:9: error: unknown type name 'u128'

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Date: Mon, 26 Feb 2024 21:03:44 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux ARM <linux-arm-kernel@...ts.infradead.org>, 
	Anna-Maria Behnsen <anna-maria@...utronix.de>, Thomas Gleixner <tglx@...utronix.de>, 
	Vincenzo Frascino <vincenzo.frascino@....com>, Ard Biesheuvel <ardb@...nel.org>, 
	Catalin Marinas <catalin.marinas@....com>, Kees Cook <keescook@...omium.org>
Subject: Re: arch/arm64/include/asm/atomic_ll_sc.h:298:9: error: unknown type
 name 'u128'

Hi Arnd,

On Fri, 23 Feb 2024 at 14:56, Arnd Bergmann <arnd@...db.de> wrote:
>
> On Fri, Feb 23, 2024, at 10:10, Naresh Kamboju wrote:
> > In file included from arch/arm64/include/asm/lse.h:5,
> >                  from arch/arm64/include/asm/cmpxchg.h:14,
> >                  from arch/arm64/include/asm/atomic.h:16,
> >                  from include/linux/atomic.h:7,
> >                  from include/asm-generic/bitops/atomic.h:5,
> >                  from arch/arm64/include/asm/bitops.h:25,
> >                  from include/linux/bitops.h:68,
> >                  from arch/arm64/include/asm/memory.h:209,
> >                  from arch/arm64/include/asm/page.h:46,
> >                  from include/vdso/datapage.h:22,
> >                  from lib/vdso/gettimeofday.c:5,
> >
> >                  from <command-line>:
> > arch/arm64/include/asm/atomic_ll_sc.h:298:9: error: unknown type name 'u128'
> >   298 |         u128 full;
> >       |         ^~~~
> > arch/arm64/include/asm/atomic_ll_sc.h:305:24: error: unknown type name 'u128'
> >   305 | static __always_inline u128
>
> The problem here is the separation of vdso/*.h headers and
> linux/*.h headers.
>
> Commit a0d2fcd62ac2 ("vdso/ARM: Make union vdso_data_store
> available for all architectures") introduced a reference to
> the asm/page.h in include/vdso/datapage.h, but this is outside
> of the vdso/*.h namespace and doesn't work in the compat vdso.
>
> I think it is only needed because of the PAGE_SIZE macro,
> so that constant needs to come from somewhere else.
>
> I have an older patch that I never merged to unify the
> page size configuration in Kconfig, and could try to
> dig that out if nobody has a better idea. If we do that,
> we could introduce a CONFIG_PAGE_SIZE.

The 16K and 64k page size builds pass.

>
>     Arnd