linux-kernel - Re: [PATCH] MIPS: Loongson64: Fix build error about redeclaration of enumerator 'VIRTUAL' and "CONFIG_DM_THIN

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Date:   Wed, 19 Aug 2020 13:47:47 +0800
From:   WANG Xuerui <kernel@...0n.name>
To:     Youling Tang <tangyouling@...ngson.cn>,
        Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: Loongson64: Fix build error about redeclaration of
 enumerator 'VIRTUAL' and "CONFIG_DM_THIN_PROVISIONING"

Hi Youling,


On 2020/8/18 19:32, Youling Tang wrote:
> After commit 39c1485c8baa (MIPS: KVM: Add kvm guestsupport for Loongson-3)
>
> Fix the following build error:
>
> drivers/md/dm-thin.c:116:2: error: redeclaration of enumerator ‘VIRTUAL’
>   VIRTUAL,
>   ^
> In file included from ./arch/mips/include/asm/mach-loongson64/mmzone.h:12:0,
>                  from ./arch/mips/include/asm/mmzone.h:12,
>                  from ./include/linux/mmzone.h:962,
>                  from ./include/linux/gfp.h:6,
>                  from ./include/linux/slab.h:15,
>                  from ./include/linux/genhd.h:16,
>                  from ./include/linux/blkdev.h:8,
>                  from drivers/md/persistent-data/dm-block-manager.h:11,
>                  from drivers/md/dm-thin-metadata.h:10,
>                  from drivers/md/dm-thin.c:7:
> ./arch/mips/include/asm/mach-loongson64/boot_param.h:198:2: note: previous
> definition of ‘VIRTUAL’ was here VIRTUAL = 3
>                                  ^
> scripts/Makefile.build:283: recipe for target 'drivers/md/dm-thin.o' failed
> make[2]: *** [drivers/md/dm-thin.o] Error 1
>
> Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
> ---
>  arch/mips/include/asm/mach-loongson64/boot_param.h | 2 +-
>  arch/mips/loongson64/env.c                         | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/mips/include/asm/mach-loongson64/boot_param.h b/arch/mips/include/asm/mach-loongson64/boot_param.h
> index afc92b7..a4ef4ac 100644
> --- a/arch/mips/include/asm/mach-loongson64/boot_param.h
> +++ b/arch/mips/include/asm/mach-loongson64/boot_param.h
> @@ -195,7 +195,7 @@ struct boot_params {
>  enum loongson_bridge_type {
>  	LS7A = 1,
>  	RS780E = 2,
> -	VIRTUAL = 3
> +	VIRT = 3

I believe this is only masking the root cause, which is redundant
#include directives inside mach-specific headers. I'll send my version
of fix shortly.

Anyway, thanks for your help!

>  };
>  
>  struct loongson_system_configuration {
> diff --git a/arch/mips/loongson64/env.c b/arch/mips/loongson64/env.c
> index 134cb8e..623b3f1 100644
> --- a/arch/mips/loongson64/env.c
> +++ b/arch/mips/loongson64/env.c
> @@ -180,8 +180,8 @@ void __init prom_init_env(void)
>  		loongson_sysconf.early_config = rs780e_early_config;
>  		break;
>  	default:
> -		pr_info("The bridge chip is VIRTUAL\n");
> -		loongson_sysconf.bridgetype = VIRTUAL;
> +		pr_info("The bridge chip is VIRT\n");
> +		loongson_sysconf.bridgetype = VIRT;
>  		loongson_sysconf.early_config = virtual_early_config;
>  		loongson_fdt_blob = __dtb_loongson64v_4core_virtio_begin;
>  		break;