Re: [XEN v3] Xen: Ensure "xenheap_bits - PAGE_SHIFT" can be used as a rhs operand of shift operator

[Bobby Eshleman <bobbyeshleman@xxxxxxxxx>]

On Fri, Dec 02, 2022 at 12:56:06PM +0000, Andrew Cooper wrote:
> On 02/12/2022 12:35, Ayan Kumar Halder wrote:
> > Currently this change will not have any impact on the existing 
> > architectures.
> > The following table illustrates PADDR_BITS vs BITS_PER_LONG of different 
> > archs
> >
> > ------------------------------------------------
> > | Arch      |   PADDR_BITS    |   BITS_PER_LONG |
> > ------------------------------------------------
> > | Arm_64    |   48            |   64            |
> > | Arm_32    |   40            |   32            |
> > | RISCV_64  |   Don't know    |   64            |
> 
> Just FYI, I think the answer here is 56 for RISC-V.
> 
> ~Andrew
> 

Andrew got it: 56.