Re: [PATCH 2/2] MIPS: Force CPUs to lose FP context during mode switches

From	"Maciej W. Rozycki" <macro@imgtec.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 2/2] MIPS: Force CPUs to lose FP context during mode switches
Date	2016-04-22 18:10 +0200
Message-ID	<rqLOy-4Dw-9@gated-at.bofh.it> (permalink)
References	<rqlhn-8vU-9@gated-at.bofh.it> <rqlhn-8vU-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Thu, 21 Apr 2016, Paul Burton wrote:

> Fix this by broadcasting an IPI if other CPUs may have live FP context
> for an affected thread, with a handler causing those CPUs to relinquish
> their FPU ownership. Threads will then be allowed to continue running
> but will stall on the wait_on_atomic_t in enable_restore_fp_context if
> they attempt to use FP again whilst the mode switch is still in
> progress. The end result is less fragile poking at scheduler context
> switch counts & a more expedient completion of the mode switch.

Reviewed-by: Maciej W. Rozycki <macro@imgtec.com>

 Thanks, Paul, for your work on this problem!  I'll rebase my outstanding 
NaN interlinking stuff (https://patchwork.linux-mips.org/patch/11491/) on 
top of your patches -- they address the concern expressed there.

  Maciej

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[PATCH 2/2] MIPS: Force CPUs to lose FP context during mode switches Paul Burton <paul.burton@imgtec.com> - 2016-04-21 13:50 +0200
  Re: [PATCH 2/2] MIPS: Force CPUs to lose FP context during mode  switches "Maciej W. Rozycki" <macro@imgtec.com> - 2016-04-22 18:10 +0200

csiph-web