linux-kernel - Re: [PATCH] arm64: Fix compilation error while accessing MPIDR_HWID

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Message-ID: <20180219110238.GA30394@arm.com>
Date:   Mon, 19 Feb 2018 11:02:39 +0000
From:   Will Deacon <will.deacon@....com>
To:     John Garry <john.garry@...wei.com>
Cc:     Bhupesh Sharma <bhsharma@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bhupesh.linux@...il.com
Subject: Re: [PATCH] arm64: Fix compilation error while accessing
 MPIDR_HWID_BITMASK from .S files

Hi John,

On Mon, Feb 19, 2018 at 10:19:35AM +0000, John Garry wrote:
> On 19/02/2018 06:39, Bhupesh Sharma wrote:
> >Since commit e1a50de37860b3a93a9d643b09638db5aff47650 (arm64: cputype:
> >Silence Sparse warnings), compilation of arm64 architecture is broken
> >with the following error messages:
> >
> >  AR      arch/arm64/kernel/built-in.o
> >  arch/arm64/kernel/head.S: Assembler messages:
> >  arch/arm64/kernel/head.S:677: Error: found 'L', expected: ')'
> >  arch/arm64/kernel/head.S:677: Error: found 'L', expected: ')'
> >  arch/arm64/kernel/head.S:677: Error: found 'L', expected: ')'
> >  arch/arm64/kernel/head.S:677: Error: junk at end of line, first
> >  unrecognized character is `L'
> >  arch/arm64/kernel/head.S:677: Error: unexpected characters following
> >  instruction at operand 2 -- `movz x1,:abs_g1_s:0xff00ffffffUL'
> >  arch/arm64/kernel/head.S:677: Error: unexpected characters following
> >  instruction at operand 2 -- `movk x1,:abs_g0_nc:0xff00ffffffUL'
> >
> >This patch fixes the same by using the UL() macro correctly for
> >assigning the MPIDR_HWID_BITMASK macro value.
> >
> >Signed-off-by: Bhupesh Sharma <bhsharma@...hat.com>
> >---
> > arch/arm64/include/asm/cputype.h | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> >diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
> >index eda8c5f629fc..350c76a1d15b 100644
> >--- a/arch/arm64/include/asm/cputype.h
> >+++ b/arch/arm64/include/asm/cputype.h
> >@@ -20,7 +20,7 @@
> >
> > #define MPIDR_UP_BITMASK	(0x1 << 30)
> > #define MPIDR_MT_BITMASK	(0x1 << 24)
> >-#define MPIDR_HWID_BITMASK	0xff00ffffffUL
> >+#define MPIDR_HWID_BITMASK	UL(0xff00ffffff)
> 
> Works for me.
> 
> FYI, I am using (old) gcc-linaro-4.8-2015.06-x86_64_aarch64.

Just to confirm: are you saying that this patch fixes the build for you,
or that mainline builds for you and the patch is not needed?

Cheers,

Will