Re: [RFC PATCH 02/34] ARM: mm: make 2-level pgd_t a scalar
"David Hildenbrand (Arm)" <[email protected]>
| Newsgroups | dev.linux.lists.loongarch,org.infradead.lists.kvm-riscv,org.infradead.lists.linux-riscv,org.kernel.vger.linux-arch,org.kernel.vger.linux-csky,org.kernel.vger.linux-kernel,org.kernel.vger.linux-m68k,org.kernel.vger.linux-mips,org.kernel.vger.linux-openrisc,org.kvack.linux-mm |
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| Message-ID | <[email protected]> |
> * | | > * +--------+ > * | | +------------+ +0 > * +- - - - + | Linux pt 0 | > * | | +------------+ +1024 > * +--------+ +0 | Linux pt 1 | > * | |-----> +------------+ +2048 > * +- - - - + +4 | h/w pt 0 | > * | |-----> +------------+ +3072 > * +--------+ +8 | h/w pt 1 | > * | | +------------+ +4096 > * > > So we interpret two 32bit entries as a pair (64bit value). Together they span > 2x256 values. > > Then we make PTRS_PER_PTE = 512, to iterate all of them (both pairs). > > Let me do some more digging to come up with something I can confidentially "with confidence", not confidentially :) -- Cheers, David