163 #define __pv_stub(from,to,instr,type)
164         __asm__("@ __pv_stubn"
165         "1:     " instr "       %0, %1, %2n"
166         "       .pushsection .pv_table,"a"n"
167         "       .long   1bn"
168         "       .popsectionn"
169         : "=r" (to)
170         : "r" (from), "I" (type))

static inline unsigned long __virt_to_phys(unsigned long x)
{       unsigned long t;
        __pv_stub(x, t, "add", __PV_BITS_31_24);
        return t;
}

CONFIG_ARM_PATCH_PHYS_VIRT:

Patch phys-to-virt and virt-to-phys translation functions at
boot and module load time according to the position of the
kernel in system memory.

This can only be used with non-XIP MMU kernels where the base
of physical memory is at a 16MB boundary, or theoretically 64K
for the MSM machine class.