Hi--
On 7/5/23 11:59, Charlie Jenkins wrote:
> Add documentation explaining the behavior of mmap. Include
> a simple test that ensures that mmap returns an address less
> than the hint address while there are still addresses available.
>
> Signed-off-by: Charlie Jenkins <charlie@xxxxxxxxxxxx>
> ---
> Documentation/riscv/vm-layout.rst | 22 +++++++++
> arch/riscv/include/asm/pgtable.h | 8 +--
> tools/testing/selftests/riscv/Makefile | 2 +-
> tools/testing/selftests/riscv/mm/.gitignore | 1 +
> tools/testing/selftests/riscv/mm/Makefile | 21 ++++++++
> .../selftests/riscv/mm/testcases/mmap.c | 49 +++++++++++++++++++
> 6 files changed, 99 insertions(+), 4 deletions(-)
> create mode 100644 tools/testing/selftests/riscv/mm/.gitignore
> create mode 100644 tools/testing/selftests/riscv/mm/Makefile
> create mode 100644 tools/testing/selftests/riscv/mm/testcases/mmap.c
>
> diff --git a/Documentation/riscv/vm-layout.rst b/Documentation/riscv/vm-layout.rst
> index 5462c84f4723..a610c68c9f3f 100644
> --- a/Documentation/riscv/vm-layout.rst
> +++ b/Documentation/riscv/vm-layout.rst
> @@ -133,3 +133,25 @@ RISC-V Linux Kernel SV57
> ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF
> ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel
> __________________|____________|__________________|_________|____________________________________________________________
> +
> +
> +Userspace VAs
> +--------------------
> +To maintain compatibility with software that relies on the VA space
> +with a maximum of 39-bits, the kernel will, by default, return virtual
39 bits,
> +return virtual addresses to userspace from a 48-bit range (sv48). This
^^ duplicate "return virtual"
> +default behavior is achieved by passing 0 into the hint address parameter
> +of mmap.
> +
> diff --git a/tools/testing/selftests/riscv/mm/.gitignore b/tools/testing/selftests/riscv/mm/.gitignore
> new file mode 100644
> index 000000000000..022ea0a3f7df
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/mm/.gitignore
> @@ -0,0 +1 @@
> +mmap
> \ No newline at end of file
add a newline, please.
> diff --git a/tools/testing/selftests/riscv/mm/Makefile b/tools/testing/selftests/riscv/mm/Makefile
> new file mode 100644
> index 000000000000..d41a0b3d2ca2
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/mm/Makefile
> @@ -0,0 +1,21 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# Originally tools/testing/selftests/arm64/signal
> +
> +# Additional include paths needed by kselftest.h and local headers
> +CFLAGS += -D_GNU_SOURCE -std=gnu99 -I.
> +
> +SRCS := $(filter-out testcases/testcases.c,$(wildcard testcases/*.c))
> +PROGS := $(patsubst %.c,%,$(SRCS))
> +
> +# Generated binaries to be installed by top KSFT script
> +TEST_GEN_PROGS := $(notdir $(PROGS))
> +
> +# Get Kernel headers installed and use them.
> +
> +# Including KSFT lib.mk here will also mangle the TEST_GEN_PROGS list
> +# to account for any OUTPUT target-dirs optionally provided by
> +# the toplevel makefile
> +include ../../lib.mk
> +
> +$(TEST_GEN_PROGS): $(PROGS)
> + cp $(PROGS) $(OUTPUT)/
> \ No newline at end of file
add a newline, please.
--
~Randy
