lkml.org 
[lkml]   [2018]   [Aug]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v4 0/5] riscv: Add support to no-FPU systems
From
On Tue, 07 Aug 2018 20:24:40 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 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/hwcap.h | 3 +
> arch/riscv/include/asm/switch_to.h | 21 ++++++
> arch/riscv/kernel/Makefile | 1 +
> arch/riscv/kernel/cpufeature.c | 11 +++
> arch/riscv/kernel/entry.S | 87 -----------------------
> arch/riscv/kernel/fpu.S | 106 +++++++++++++++++++++++++++++
> arch/riscv/kernel/process.c | 4 +-
> arch/riscv/kernel/signal.c | 79 +++++++++++++--------
> 10 files changed, 214 insertions(+), 126 deletions(-)
> create mode 100644 arch/riscv/kernel/fpu.S

Aside from the CFLAGS issue this looks good. I've queued this up in
kernel.org/palmer/linux.git/next-nofpu, but I'm not going to put this on
for-next until after the merge window closes.

Thanks!

\
 
 \ /
  Last update: 2018-08-21 00:23    [W:0.066 / U:8.848 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site