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Message-ID: <20230714-hangnail-stinking-60f9725ac0d5@spud>
Date: Fri, 14 Jul 2023 12:17:00 +0100
From: Conor Dooley <conor@...nel.org>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
paul.walmsley@...ive.com, palmer@...osinc.com,
aou@...s.berkeley.edu, anup@...infault.org,
konstantin@...uxfoundation.org, linux-doc@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
mick@....forth.gr, jrtc27@...c27.com, rdunlap@...radead.org,
alexghiti@...osinc.com
Subject: Re: [PATCH v5 0/4] RISC-V: mm: Make SV48 the default address space
On Thu, Jul 13, 2023 at 05:13:59PM -0700, Charlie Jenkins wrote:
> Make sv48 the default address space for mmap as some applications
> currently depend on this assumption. Users can now select a
> desired address space using a non-zero hint address to mmap. Previously,
> requesting the default address space from mmap by passing zero as the hint
> address would result in using the largest address space possible. Some
> applications depend on empty bits in the virtual address space, like Go and
> Java, so this patch provides more flexibility for application developers.
The patchwork automation failed to apply this, what is the base for the
series?
>
> -Charlie
>
> ---
> v5:
> - Minor wording change in documentation
> - Change some parenthesis in arch_get_mmap_ macros
> - Added case for addr==0 in arch_get_mmap_ because without this, programs would
> crash if RLIMIT_STACK was modified before executing the program. This was
> tested using the libhugetlbfs tests.
>
> v4:
> - Split testcases/document patch into test cases, in-code documentation, and
> formal documentation patches
> - Modified the mmap_base macro to be more legible and better represent memory
> layout
> - Fixed documentation to better reflect the implmentation
> - Renamed DEFAULT_VA_BITS to MMAP_VA_BITS
> - Added additional test case for rlimit changes
> ---
>
> Charlie Jenkins (4):
> RISC-V: mm: Restrict address space for sv39,sv48,sv57
> RISC-V: mm: Add tests for RISC-V mm
> RISC-V: mm: Update pgtable comment documentation
> RISC-V: mm: Document mmap changes
>
> Documentation/riscv/vm-layout.rst | 22 +++
> arch/riscv/include/asm/elf.h | 2 +-
> arch/riscv/include/asm/pgtable.h | 20 ++-
> arch/riscv/include/asm/processor.h | 46 +++++-
> 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 | 133 ++++++++++++++++++
> 8 files changed, 234 insertions(+), 13 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
>
> --
> 2.41.0
>
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