This patchset intends to improve tlb utilization by using hugepages for the linear mapping. As reported by Anup in v6, when STRICT_KERNEL_RWX is enabled, we must take care of isolating the kernel text and rodata so that they are not mapped with a PUD mapping which would then assign wrong permissions to the whole region: it is achieved by introducing a new memblock API. Another patch makes use of this new API in arm64 which used some sort of hack to solve this issue: it was built/boot tested successfully. base-commit-tag: v6.3-rc1 v7: - Fix Anup bug report by introducing memblock_isolate_memory which allows us to split the memblock mappings and then avoid to map the the PUD which contains the kernel as read only - Add a patch to arm64 to use this newly introduced API v6: - quiet LLVM warning by casting phys_ram_base into an unsigned long v5: - Fix nommu builds by getting rid of riscv_pfn_base in patch 1, thanks Conor - Add RB from Andrew v4: - Rebase on top of v6.2-rc3, as noted by Conor - Add Acked-by Rob v3: - Change the comment about initrd_start VA conversion so that it fits ARM64 and RISCV64 (and others in the future if needed), as suggested by Rob v2: - Add a comment on why RISCV64 does not need to set initrd_start/end that early in the boot process, as asked by Rob Alexandre Ghiti (4): riscv: Get rid of riscv_pfn_base variable mm: Introduce memblock_isolate_memory arm64: Make use of memblock_isolate_memory for the linear mapping riscv: Use PUD/P4D/PGD pages for the linear mapping arch/arm64/mm/mmu.c | 4 ++-- arch/riscv/include/asm/page.h | 19 +++++++++++++++-- arch/riscv/mm/init.c | 39 ++++++++++++++++++++++++++--------- arch/riscv/mm/physaddr.c | 16 ++++++++++++++ drivers/of/fdt.c | 11 +++++----- include/linux/memblock.h | 1 + mm/memblock.c | 22 +++++++++++++++++++- 7 files changed, 92 insertions(+), 20 deletions(-) -- 2.37.2
