• Linus Torvalds's avatar
    Merge tag 'powerpc-4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 685f7e4f
    Linus Torvalds authored
    Pull powerpc updates from Michael Ellerman:
     "Notable changes:
    
       - A large series to rewrite our SLB miss handling, replacing a lot of
         fairly complicated asm with much fewer lines of C.
    
       - Following on from that, we now maintain a cache of SLB entries for
         each process and preload them on context switch. Leading to a 27%
         speedup for our context switch benchmark on Power9.
    
       - Improvements to our handling of SLB multi-hit errors. We now print
         more debug information when they occur, and try to continue running
         by flushing the SLB and reloading, rather than treating them as
         fatal.
    
       - Enable THP migration on 64-bit Book3S machines (eg. Power7/8/9).
    
       - Add support for physical memory up to 2PB in the linear mapping on
         64-bit Book3S. We only support up to 512TB as regular system
         memory, otherwise the percpu allocator runs out of vmalloc space.
    
       - Add stack protector support for 32 and 64-bit, with a per-task
         canary.
    
       - Add support for PTRACE_SYSEMU and PTRACE_SYSEMU_SINGLESTEP.
    
       - Support recognising "big cores" on Power9, where two SMT4 cores are
         presented to us as a single SMT8 core.
    
       - A large series to cleanup some of our ioremap handling and PTE
         flags.
    
       - Add a driver for the PAPR SCM (storage class memory) interface,
         allowing guests to operate on SCM devices (acked by Dan).
    
       - Changes to our ftrace code to handle very large kernels, where we
         need to use a trampoline to get to ftrace_caller().
    
      And many other smaller enhancements and cleanups.
    
      Thanks to: Alan Modra, Alistair Popple, Aneesh Kumar K.V, Anton
      Blanchard, Aravinda Prasad, Bartlomiej Zolnierkiewicz, Benjamin
      Herrenschmidt, Breno Leitao, Cédric Le Goater, Christophe Leroy,
      Christophe Lombard, Dan Carpenter, Daniel Axtens, Finn Thain, Gautham
      R. Shenoy, Gustavo Romero, Haren Myneni, Hari Bathini, Jia Hongtao,
      Joel Stanley, John Allen, Laurent Dufour, Madhavan Srinivasan, Mahesh
      Salgaonkar, Mark Hairgrove, Masahiro Yamada, Michael Bringmann,
      Michael Neuling, Michal Suchanek, Murilo Opsfelder Araujo, Nathan
      Fontenot, Naveen N. Rao, Nicholas Piggin, Nick Desaulniers, Oliver
      O'Halloran, Paul Mackerras, Petr Vorel, Rashmica Gupta, Reza Arbab,
      Rob Herring, Sam Bobroff, Samuel Mendoza-Jonas, Scott Wood, Stan
      Johnson, Stephen Rothwell, Stewart Smith, Suraj Jitindar Singh, Tyrel
      Datwyler, Vaibhav Jain, Vasant Hegde, YueHaibing, zhong jiang"
    
    * tag 'powerpc-4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (221 commits)
      Revert "selftests/powerpc: Fix out-of-tree build errors"
      powerpc/msi: Fix compile error on mpc83xx
      powerpc: Fix stack protector crashes on CPU hotplug
      powerpc/traps: restore recoverability of machine_check interrupts
      powerpc/64/module: REL32 relocation range check
      powerpc/64s/radix: Fix radix__flush_tlb_collapsed_pmd double flushing pmd
      selftests/powerpc: Add a test of wild bctr
      powerpc/mm: Fix page table dump to work on Radix
      powerpc/mm/radix: Display if mappings are exec or not
      powerpc/mm/radix: Simplify split mapping logic
      powerpc/mm/radix: Remove the retry in the split mapping logic
      powerpc/mm/radix: Fix small page at boundary when splitting
      powerpc/mm/radix: Fix overuse of small pages in splitting logic
      powerpc/mm/radix: Fix off-by-one in split mapping logic
      powerpc/ftrace: Handle large kernel configs
      powerpc/mm: Fix WARN_ON with THP NUMA migration
      selftests/powerpc: Fix out-of-tree build errors
      powerpc/time: no steal_time when CONFIG_PPC_SPLPAR is not selected
      powerpc/time: Only set CONFIG_ARCH_HAS_SCALED_CPUTIME on PPC64
      powerpc/time: isolate scaled cputime accounting in dedicated functions.
      ...
    685f7e4f
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