linux-kernel - Re: [PATCH v2] mips: BCM63XX: ensure that CPU_SUPPORTS_32BIT

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Date:   Tue, 9 Nov 2021 16:29:54 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-mips@...r.kernel.org,
        Paul Burton <paulburton@...nel.org>,
        Maxime Bizon <mbizon@...ebox.fr>,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH v2] mips: BCM63XX: ensure that CPU_SUPPORTS_32BIT_KERNEL
 is set

On Sat, Nov 06, 2021 at 08:49:11AM -0700, Randy Dunlap wrote:
> Several header files need info on CONFIG_32BIT or CONFIG_64BIT,
> but kconfig symbol BCM63XX does not provide that info. This leads
> to many build errors, e.g.:
> 
>    arch/mips/include/asm/page.h:196:13: error: use of undeclared identifier 'CAC_BASE'
>            return x - PAGE_OFFSET + PHYS_OFFSET;
>    arch/mips/include/asm/mach-generic/spaces.h:91:23: note: expanded from macro 'PAGE_OFFSET'
>    #define PAGE_OFFSET             (CAC_BASE + PHYS_OFFSET)
>    arch/mips/include/asm/io.h:134:28: error: use of undeclared identifier 'CAC_BASE'
>            return (void *)(address + PAGE_OFFSET - PHYS_OFFSET);
>    arch/mips/include/asm/mach-generic/spaces.h:91:23: note: expanded from macro 'PAGE_OFFSET'
>    #define PAGE_OFFSET             (CAC_BASE + PHYS_OFFSET)
> 
> arch/mips/include/asm/uaccess.h:82:10: error: use of undeclared identifier '__UA_LIMIT'
>            return (__UA_LIMIT & (addr | (addr + size) | __ua_size(size))) == 0;
> 
> 
> Selecting the SYS_HAS_CPU_BMIPS* symbols causes SYS_HAS_CPU_BMIPS to be
> set, which then selects CPU_SUPPORT_32BIT_KERNEL, which causes
> CONFIG_32BIT to be set. (a bit more indirect than v1 [RFC].)
> 
> Fixes: e7300d04bd08 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Reported-by: kernel test robot <lkp@...el.com>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Florian Fainelli <f.fainelli@...il.com>
> Cc: bcm-kernel-feedback-list@...adcom.com
> Cc: linux-mips@...r.kernel.org
> Cc: Paul Burton <paulburton@...nel.org>
> Cc: Maxime Bizon <mbizon@...ebox.fr>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Suggested-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> v2: select 3 SYS_HAS_CPU_BMIPS* symbols that will cause
>     CPU_SUPPORTS_32BIT_KERNEL to be set (Florian)
> 
>  arch/mips/Kconfig |    3 +++
>  1 file changed, 3 insertions(+)
> 
> --- linux-next-20211105.orig/arch/mips/Kconfig
> +++ linux-next-20211105/arch/mips/Kconfig
> @@ -332,6 +332,9 @@ config BCM63XX
>  	select SYS_SUPPORTS_32BIT_KERNEL
>  	select SYS_SUPPORTS_BIG_ENDIAN
>  	select SYS_HAS_EARLY_PRINTK
> +	select SYS_HAS_CPU_BMIPS32_3300
> +	select SYS_HAS_CPU_BMIPS4350
> +	select SYS_HAS_CPU_BMIPS4380
>  	select SWAP_IO_SPACE
>  	select GPIOLIB
>  	select MIPS_L1_CACHE_SHIFT_4

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]