MIPS: Expand __swp_offset() to carry 40 significant bits for 64-bit kernel.
With CONFIG_MIGRATION, the PFN of the migrating pages is stored in __swp_offset(), so we must have enough bits to store the largest possible PFN. OCTEON NUMA systems have 41 bits of physical address space, so with 4K pages (12-bits), we need at least 29 bits to store the PFN. The current width of 24-bits is too narrow, so expand it all the way out to 40-bits. This leaves the low order 16 bits as zero which does not interfere with any of the PTE bits. Signed-off-by: David Daney <david.daney@cavium.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9315/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Showing
Please register or sign in to comment