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