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SubjectRe: [PATCH v7 0/5] riscv: Add support to no-FPU systems
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On Sun, 26 Aug 2018 18:07:50 PDT (-0700), alankao@andestech.com wrote:
> This patchset adds an option, CONFIG_FPU, to enable/disable floating-
> point procedures.
>
> Kernel's new behavior will be as follows:
>
> * with CONFIG_FPU=y
> All FPU codes are reserved. If no FPU is found during booting, a
> global flag will be set, and those functions will be bypassed with
> condition check to that flag.
>
> * with CONFIG_FPU=n
> No floating-point instructions in kernel and all related settings
> are excluded.
>
> Changes in v7:
> - Remove "fd" attribute from KBUILD_CFLAGS.
>
> Changes in v6 (PATCH 0005 only):
> - Make the flag checking neater.
>
> Changes in v5:
> - Invert the polarity of checking flag from no_fpu to has_fpu.
>
> Changes in v4:
> - Append a new patch to detect existence of FPU and followups.
> - Add SPDX header to newly created fpu.S.
> - Fix a build error, sorry for that.
> - Fix wording, style, etc.
>
> Changes in v3:
> - Refactor the whole patch into independent ones.
>
> Changes in v2:
> - Various code cleanups and style fixes.
>
>
> Alan Kao (5):
> Extract FPU context operations from entry.S
> Refactor FPU code in signal setup/return procedures
> Cleanup ISA string setting
> Allow to disable FPU support
> Auto-detect whether a FPU exists
>
> arch/riscv/Kconfig | 9 +++
> arch/riscv/Makefile | 19 +++---
> arch/riscv/include/asm/switch_to.h | 12 +++-
> arch/riscv/kernel/Makefile | 1 +
> arch/riscv/kernel/cpufeature.c | 8 +++
> arch/riscv/kernel/entry.S | 87 -----------------------
> arch/riscv/kernel/fpu.S | 106 +++++++++++++++++++++++++++++
> arch/riscv/kernel/process.c | 6 +-
> arch/riscv/kernel/signal.c | 75 ++++++++++++--------
> 9 files changed, 196 insertions(+), 127 deletions(-)
> create mode 100644 arch/riscv/kernel/fpu.S

Thanks! I'll add this to our for-next branch.

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