This tag contains the fixes we'd like to target for the 4.16 merge
window. It's not as much as I was originally hoping to do but between
glibc, the chip, and FOSDEM there just wasn't enough time to get
everything put together. As such, this merge window is essentially just
going to be small changes. This includes mostly cleanups:
* A build fix failure to the audit test cases. RISC-V doesn't have
renameat because the generic syscall ABI moved to renameat2 by the
time of our port. The syscall audit test cases don't understand this,
so I added a trivial fix. This went through mailing list review
during the 4.15 merge window, but nobody has picked it up so I think
it's best to just do this here.
* The removal of our command-line argument processing code. The
"mem_end" stuff was broken and the rest duplicated generic device tree
code. The generic code was already being called.
* Some unused/redundant code has been removed, including
__ARCH_HAVE_MMU, current_pgdir, and the initialization of init_mm.pgd.
* SUM is disabled upon taking a trap, which means that user memory is
protected during traps taking inside copy_{to,from}_user().
* The sptbr CSR has been renamed to satp in C code. We haven't changed
the assembly code in order to maintain compatibility with binutils
2.29, which doesn't understand the new name.
Additionally, we're adding some new features:
* Basic ftrace support, thanks to Alan Kao!
* Support for ZONE_DMA32. This is necessary for all the normal reasons,
but also to deal with a deficiency in the Xilinx PCIe controller we're
using on our FPGA-based systems. While the ZONE_DMA32 addition should
be sufficient for most uses, it doesn't complete the fix for the
Xilinx controller.
* TLB shootdowns now only target the harts where they're necessary,
instead of applying to all harts in the system.
These patches have all been sitting on our linux-next branch for a while
now. Due to time constraints this is all I feel comfortable submitting
during the 4.16 merge window, hopefully we'll do better next time!
-----BEGIN PGP SIGNATURE-----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=cNRH
-----END PGP SIGNATURE-----
Merge tag 'riscv-for-linus-4.16-merge_window' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux
Pull RISC-V updates from Palmer Dabbelt:
"This contains the fixes we'd like to target for the 4.16 merge window.
It's not as much as I was originally hoping to do but between glibc,
the chip, and FOSDEM there just wasn't enough time to get everything
put together. As such, this merge window is essentially just going to
be small changes. This includes mostly cleanups:
- A build fix failure to the audit test cases.
RISC-V doesn't have renameat because the generic syscall ABI moved
to renameat2 by the time of our port. The syscall audit test cases
don't understand this, so I added a trivial fix. This went through
mailing list review during the 4.15 merge window, but nobody has
picked it up so I think it's best to just do this here.
- The removal of our command-line argument processing code. The
"mem_end" stuff was broken and the rest duplicated generic device
tree code. The generic code was already being called.
- Some unused/redundant code has been removed, including
__ARCH_HAVE_MMU, current_pgdir, and the initialization of
init_mm.pgd.
- SUM is disabled upon taking a trap, which means that user memory is
protected during traps taking inside copy_{to,from}_user().
- The sptbr CSR has been renamed to satp in C code. We haven't
changed the assembly code in order to maintain compatibility with
binutils 2.29, which doesn't understand the new name.
Additionally, we're adding some new features:
- Basic ftrace support, thanks to Alan Kao!
- Support for ZONE_DMA32.
This is necessary for all the normal reasons, but also to deal with
a deficiency in the Xilinx PCIe controller we're using on our
FPGA-based systems. While the ZONE_DMA32 addition should be
sufficient for most uses, it doesn't complete the fix for the
Xilinx controller.
- TLB shootdowns now only target the harts where they're necessary,
instead of applying to all harts in the system.
These patches have all been sitting on our linux-next branch for a
while now. Due to time constraints this is all I feel comfortable
submitting during the 4.16 merge window, hopefully we'll do better
next time!"
[ Note to self: "harts" is RISC-V speak for "hardware threads". I had
to look that up. - Linus ]
* tag 'riscv-for-linus-4.16-merge_window' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux:
riscv: inline set_pgdir into its only caller
riscv: rename sptbr to satp
riscv: don't read back satp in paging_init
riscv: remove the unused current_pgdir function
riscv: add ZONE_DMA32
RISC-V: Limit the scope of TLB shootdowns
riscv: disable SUM in the exception handler
riscv: remove redundant unlikely()
riscv: remove unused __ARCH_HAVE_MMU define
riscv/ftrace: Add basic support
RISC-V: Remove mem_end command line processing
RISC-V: Remove duplicate command-line parsing logic
audit: Avoid build failures on systems without renameat
413879a10b