Merge tag 'nolibc.2022.09.30a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull nolibc updates from Paul McKenney:
 "Most notably greatly improved testing. These tests are located in
  tools/testing/selftests/nolibc. The output of "make help" is as
  follows:

    Supported targets under selftests/nolibc:
      all          call the "run" target below
      help         this help
      sysroot      create the nolibc sysroot here (uses $ARCH)
      nolibc-test  build the executable (uses $CC and $CROSS_COMPILE)
      initramfs    prepare the initramfs with nolibc-test
      defconfig    create a fresh new default config (uses $ARCH)
      kernel       (re)build the kernel with the initramfs (uses $ARCH)
      run          runs the kernel in QEMU after building it (uses $ARCH, $TEST)
      rerun        runs a previously prebuilt kernel in QEMU (uses $ARCH, $TEST)
      clean        clean the sysroot, initramfs, build and output files

    The output file is "run.out". Test ranges may be passed using $TEST.

    Currently using the following variables:
      ARCH          = x86
      CROSS_COMPILE =
      CC            = gcc
      OUTPUT        = /home/git/linux-rcu/tools/testing/selftests/nolibc/
      TEST          =
      QEMU_ARCH     = x86_64 [determined from $ARCH]
      IMAGE_NAME    = bzImage [determined from $ARCH]

  The output of a successful x86 "make run" is currently as follows,
  with kernel build output omitted:

    $ make run
    71 test(s) passed."

* tag 'nolibc.2022.09.30a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  selftests/nolibc: Avoid generated files being committed
  selftests/nolibc: add a "help" target
  selftests/nolibc: "sysroot" target installs a local copy of the sysroot
  selftests/nolibc: add a "run" target to start the kernel in QEMU
  selftests/nolibc: add a "defconfig" target
  selftests/nolibc: add a "kernel" target to build the kernel with the initramfs
  selftests/nolibc: support glibc as well
  selftests/nolibc: condition some tests on /proc existence
  selftests/nolibc: recreate and populate /dev and /proc if missing
  selftests/nolibc: on x86, support exiting with isa-debug-exit
  selftests/nolibc: exit with poweroff on success when getpid() == 1
  selftests/nolibc: add a few tests for some libc functions
  selftests/nolibc: implement a few tests for various syscalls
  selftests/nolibc: support a test definition format
  selftests/nolibc: add basic infrastructure to ease creation of nolibc tests
  tools/nolibc: make sys_mmap() automatically use the right __NR_mmap definition
  tools/nolibc: fix build warning in sys_mmap() when my_syscall6 is not defined
  tools/nolibc: make argc 32-bit in riscv startup code

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