linux-kernel - Re: [next] arm: current.h:53:6: error: out of range pc-relative fixup value

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Date:   Wed, 22 Dec 2021 11:32:48 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     llvm@...ts.linux.dev, open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Nicolas Pitre <nico@...xnic.net>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [next] arm: current.h:53:6: error: out of range pc-relative
 fixup value

On Wed, Dec 22, 2021 at 11:57:20PM +0530, Naresh Kamboju wrote:
> [ Please ignore this email if it is already reported ]
> 
> On Linux next 20211220 (and  20211222) tag following arm config builds failed
> with clang-11, clang-12, clang-13 and clang-nightly.
> 
> Build errors:
> -------------
> In file included from /builds/linux/kernel/sched/core.c:10:
> In file included from /builds/linux/include/trace/events/sched.h:8:
> In file included from /builds/linux/include/linux/kthread.h:6:
> In file included from /builds/linux/include/linux/sched.h:12:
> /builds/linux/arch/arm/include/asm/current.h:53:6: error: out of range
> pc-relative fixup value
>         asm(LOAD_SYM_ARMV6(%0, __current) : "=r"(cur));
>             ^
> /builds/linux/arch/arm/include/asm/insn.h:25:2: note: expanded from
> macro 'LOAD_SYM_ARMV6'
>         "       ldr     " #reg ", =" #sym "                     \n\t"   \
>         ^
> <inline asm>:1:3: note: instantiated into assembly here
>                 ldr     r2, =__current
>                 ^

Report on our issue tracker with discussion:

https://github.com/ClangBuiltLinux/linux/issues/1551

Ard has a fix that should resolve this here:

https://lore.kernel.org/r/20211222104939.1154570-1-ardb@kernel.org/

I am about to reply with a Tested-by tag, I have tested LLVM 12 and 13
and my 14 build is running right now. Might be helpful for you to run
that patch through your matrix as well.

Cheers,
Nathan