linux-kernel - Re: arm64: compiler_types.h:320:38: error: call to __compiletime_assert

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Message-ID: <20210319175423.GE6832@arm.com>
Date:   Fri, 19 Mar 2021 17:54:23 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, glittao@...il.com,
        Marco Elver <elver@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: arm64: compiler_types.h:320:38: error: call to
 __compiletime_assert_417

On Fri, Mar 19, 2021 at 08:49:07PM +0530, Naresh Kamboju wrote:
> [This email landed to Spam for some reason, sending it again with modified
> subject]
> 
> While building arm64 kernel modules the following kernel warnings /
> errors noticed on linux next 20210318 tag the gcc version is 7.3.0.
> Build PASS with gcc-8, gcc-9 and gcc-10.
> 
>  In file included from <command-line>:0:0:
>  In function 'resiliency_test',
>      inlined from 'test_slub_init' at   lib/test_slub.c:120:2:
>    include/linux/compiler_types.h:320:38: error: call to
> '__compiletime_assert_417' declared with attribute error: BUILD_BUG_ON
> failed: KMALLOC_MIN_SIZE > 16 | KMALLOC_SHIFT_HIGH < 10

KMALLOC_MIN_SIZE is 128 on arm64, so commit 1a58eef5def9 ("selftests:
add a kselftest for SLUB debugging functionality") breaks the build. The
test was previously in mm/slub.c hidden behind macro that no-one
enabled.

-- 
Catalin