linux-kernel - Re: [PATCH] powerpc/mpc85xx: also write addr

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Message-ID: <a37338283db548c58e6c36e4996a9474b1fe2038.camel@buserror.net>
Date:   Wed, 25 Dec 2019 00:51:11 -0600
From:   Scott Wood <oss@...error.net>
To:     Yingjie Bai <byj.tea@...il.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>, yingjie_bai@....com,
        Kumar Gala <galak@...nel.crashing.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/mpc85xx: also write addr_h to spin table for
 64bit boot entry

On Wed, 2019-12-25 at 11:24 +0800, Yingjie Bai wrote:
> Hi Scott,
> 
> __pa() returns 64bit in my setup.
> 
> in arch/powerpc/include/asm/page.h
> 
> #if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
> #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) +
> VIRT_PHYS_OFFSET))
> #define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET)
> #else
> #ifdef CONFIG_PPC64
> ...
> 
> 
> 
> /* See Description below for VIRT_PHYS_OFFSET */
> #if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
> #ifdef CONFIG_RELOCATABLE
> #define VIRT_PHYS_OFFSET virt_phys_offset
> #else
> #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START)
> #endif
> #endif

OK, so it's the lack of CONFIG_RELOCATABLE causing the build to fail.  Ideally
we'd make __pa() consistently return phys_addr_t, even if the upper bits are
known to always be zero in a particular config.

-Scott