prov/opx: PAGE_MASK undefined on RISC-V

[Cryolitia]

Describe the bug
After #10308 , it seems that PAGE_MASK in opx_hfi1_pre_cn5000.h is also undefined, which blocks the build on RISC-V.

https://github.com/ofiwg/libfabric/blob/f893f5f88eb5cf0f4cf4e0154edc91e0b6f8b7bf/prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h#L119C54-L119C63

To Reproduce
Steps to reproduce the behavior:

Build it on Arch Linux RISC-V

Expected behavior
Success to build.

Should it be just replaced with page_sizes[OFI_PAGE_SIZE] - 1 or other? I'm not familiar with it.

Output

In file included from prov/opx/src/fi_opx_hfi1.c:50:
./prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h: In function 'opx_hfi_mmap_rheq':
./prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h:119:56: error: 'PAGE_MASK' undeclared (first use in this function); did you mean 'GENMASK'?
  119 | #define opx_offset_in_page(p)   ((unsigned long)(p) & ~PAGE_MASK)
      |                                                        ^~~~~~~~~
./prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h:122:12: note: in definition of macro 'OPX_HFI1_MMAP_TOKEN_SET'
  122 |         (((val) & OPX_HFI1_MMAP_##field##_MASK) << OPX_HFI1_MMAP_##field##_SHIFT)
      |            ^~~
./prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h:132:42: note: in expansion of macro 'opx_offset_in_page'
  132 |         OPX_HFI1_MMAP_TOKEN_SET(OFFSET, (opx_offset_in_page(addr))))
      |                                          ^~~~~~~~~~~~~~~~~~
./prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h:142:27: note: in expansion of macro 'OPX_HFI1_MMAP_TOKEN'
  142 |         __off64_t token = OPX_HFI1_MMAP_TOKEN(OPX_RCV_RHEQ,
      |                           ^~~~~~~~~~~~~~~~~~~
./prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h:119:56: note: each undeclared identifier is reported only once for each function it appears in
  119 | #define opx_offset_in_page(p)   ((unsigned long)(p) & ~PAGE_MASK)
      |                                                        ^~~~~~~~~
./prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h:122:12: note: in definition of macro 'OPX_HFI1_MMAP_TOKEN_SET'
  122 |         (((val) & OPX_HFI1_MMAP_##field##_MASK) << OPX_HFI1_MMAP_##field##_SHIFT)
      |            ^~~
./prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h:132:42: note: in expansion of macro 'opx_offset_in_page'
  132 |         OPX_HFI1_MMAP_TOKEN_SET(OFFSET, (opx_offset_in_page(addr))))
      |                                          ^~~~~~~~~~~~~~~~~~
./prov/opx/include/rdma/opx/opx_hfi1_pre_cn5000.h:142:27: note: in expansion of macro 'OPX_HFI1_MMAP_TOKEN'
  142 |         __off64_t token = OPX_HFI1_MMAP_TOKEN(OPX_RCV_RHEQ,
      |                           ^~~~~~~~~~~~~~~~~~~
make[1]: *** [Makefile:30003: prov/opx/src/src_libfabric_la-fi_opx_hfi1.lo] Error 1
make[1]: Leaving directory '/build/libfabric/src/libfabric-2.0.0'
make: *** [Makefile:9306: all] Error 2

Environment:
Arch Linux RISC-V

Additional context
Add any other context about the problem here.

[j-xiong]

Yes, I think you can replace ~PAGE_MASK with page_sizes[OFI_PAGE_SIZE]-1.

@charlesshereda Can you confirm?