linux-kernel - [BUG] arm64: Build error with gcc 6

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Date:   Sun, 25 Feb 2018 11:50:37 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Robin Murphy <robin.murphy@....com>,
        Catalin Marinas <catalin.marinas@....com>
Cc:     Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [BUG] arm64: Build error with gcc 6

Hello,

commit e1a50de37860 ("arm64: cputype: Silence Sparse warnings")
introduces "UL" suffix to a hex number, but it causes a build error with gcc-6 series.
I've hit below error with 6.2.1 and 6.4.1. Of course this is resolved by the latest
stable gcc-7.2.1. But from the compatibility point of view, should we revert it?

  AS      arch/arm64/kernel/head.o
/home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S: Assembler messages:
/home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: found 'L', expected: ')'
/home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: found 'L', expected: ')'
/home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: found 'L', expected: ')'
/home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: junk at end of line, first unrecognized character is `L'
/home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: unexpected characters following instruction at operand 2 -- `movz x1,:abs_g1_s:0xff00ffffffUL'
/home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: unexpected characters following instruction at operand 2 -- `movk x1,:abs_g0_nc:0xff00ffffffUL'
make[2]: *** [/home/mhiramat/ksrc/linux/scripts/Makefile.build:425: arch/arm64/kernel/head.o] error 1

I've checked with below 2 latest gccs.

http://releases.linaro.org/components/toolchain/binaries/latest-6/aarch64-linux-gnu/gcc-linaro-6.4.1-2017.11-x86_64_aarch64-linux-gnu.tar.xz

http://releases.linaro.org/components/toolchain/binaries/latest-7/aarch64-linux-gnu/gcc-linaro-7.2.1-2017.11-x86_64_aarch64-linux-gnu.tar.xz

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>