Balbir Singh <bsinghar...@gmail.com> writes: > On Thu, Feb 02, 2017 at 09:23:33PM +1100, Michael Ellerman wrote: >> +config ARCH_MMAP_RND_BITS_MIN >> + # On 64-bit up to 1G of address space (2^30) >> + default 12 if 64BIT && PPC_256K_PAGES # 256K (2^18), = 30 - 18 = 12 >> + default 14 if 64BIT && PPC_64K_PAGES # 64K (2^16), = 30 - 16 = 14 >> + default 16 if 64BIT && PPC_16K_PAGES # 16K (2^14), = 30 - 14 = 16 >> + default 18 if 64BIT # 4K (2^12), = 30 - 12 = 18 >> + default ARCH_MMAP_RND_COMPAT_BITS_MIN >> + >> +config ARCH_MMAP_RND_BITS_MAX >> + # On 64-bit up to 32T of address space (2^45) > > I thought it was 64T, TASK_SIZE_USER64 is 2^46?
The virtual address space is 64T. The comment is talking about how much can be taking up by the randomisation factor. cheers
