mbox series

[v4,0/2] RISC-V: clarify what some RISCV_ISA* config options do & redo Zbb toolchain dependency

Message ID 20241024-aspire-rectify-9982da6943e5@spud (mailing list archive)
Headers show
Series RISC-V: clarify what some RISCV_ISA* config options do & redo Zbb toolchain dependency | expand

Message

Conor Dooley Oct. 24, 2024, 10:19 a.m. UTC 
From: Conor Dooley <conor.dooley@microchip.com>

Since one depends on the other, albeit trivially, here's a v4 of the Zbb
toolchain dep removal alongside the rewording of Kconfig options I'd
sent out before the merge window. I think I like this implementation
better than v1, but I couldn't think of a good name for a "public"
version of __ALTERNATIVE(), so I used it here directly.
Unfortunately "ALTERNATIVE_2_CFG" already exists and I couldn't think of
a good way to name an alternative macro that allows for several config
options that didn't make the distinction sufficiently clear.. Yell
if you have better suggestions than I did.

I am a wee bit "worried" that this makes the Kconfig option confusing as
it isn't immediately obvious if someone is or is not going to get the
toolchain based optimisations.

Cheers,
Conor.

v4:
- rebase since it's been a few months
- change some wording Alex wasn't fond of in patch 1
- remove a left over CONFIG_RISCV_ISA_ZBB_ALT from the v1 implementation
  in patch 2

CC: xiao.w.wang@intel.com
CC: Andrew Jones <ajones@ventanamicro.com>
CC: pulehui@huawei.com
CC: Charlie Jenkins <charlie@rivosinc.com>
CC: Paul Walmsley <paul.walmsley@sifive.com>
CC: Palmer Dabbelt <palmer@dabbelt.com>
CC: Conor Dooley <conor.dooley@microchip.com>
CC: linux-riscv@lists.infradead.org
CC: linux-kernel@vger.kernel.org
CC: Samuel Holland <samuel.holland@sifive.com>
CC: Pu Lehui <pulehui@huaweicloud.com>
CC: Björn Töpel <bjorn@kernel.org>
CC: Andrew Jones <ajones@ventanamicro.com>
CC: Paul Walmsley <paul.walmsley@sifive.com>
CC: Palmer Dabbelt <palmer@dabbelt.com>
CC: linux-riscv@lists.infradead.org

Conor Dooley (2):
  RISC-V: clarify what some RISCV_ISA* config options do
  RISC-V: separate Zbb optimisations requiring and not requiring
    toolchain support

 arch/riscv/Kconfig                    | 38 ++++++++++++++-------------
 arch/riscv/include/asm/arch_hweight.h |  6 ++---
 arch/riscv/include/asm/bitops.h       |  4 +--
 arch/riscv/include/asm/checksum.h     |  3 +--
 arch/riscv/lib/csum.c                 | 21 +++------------
 arch/riscv/lib/strcmp.S               |  5 ++--
 arch/riscv/lib/strlen.S               |  5 ++--
 arch/riscv/lib/strncmp.S              |  5 ++--
 8 files changed, 38 insertions(+), 49 deletions(-)