linux-kernel - Re: [RFC PATCH v2 00/13] objtool: add base support for arm64

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Message-Id: <20210305235102.384950-1-ndesaulniers@google.com>
Date:   Fri,  5 Mar 2021 15:51:02 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     jthierry@...hat.com
Cc:     ardb@...nel.org, catalin.marinas@....com, jpoimboe@...hat.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, masahiroy@...nel.org, peterz@...radead.org,
        will@...nel.org, ycote@...hat.com, maskray@...gle.com,
        morbo@...gle.com, swine@...gle.com, yonghyun@...gle.com,
        clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [RFC PATCH v2 00/13] objtool: add base support for arm64

(in response to
https://lore.kernel.org/linux-arm-kernel/20210303170932.1838634-1-jthierry@redhat.com/
from the command line)

> Changes since v1[2]:
> - Drop gcc plugin in favor of -fno-jump-tables

Thank you for this!  I built+booted(under emulation) arm64 defconfig and built
arm64 allmodconfig with LLVM=1 with this series applied.

Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>

One thing I noticed was a spew of warnings for allmodconfig, like:
init/main.o: warning: objtool: asan.module_ctor()+0xc: call without frame pointer save/setup
init/main.o: warning: objtool: asan.module_dtor()+0xc: call without frame pointer save/setup

I assume those are from the KASAN constructors. See also:
https://github.com/ClangBuiltLinux/linux/issues/1238

Can we disable HAVE_STACK_PROTECTOR if CC_IS_CLANG and CONFIG_KASAN is set,
until we can resolve the above issue?