lkml.org 
[lkml]   [2018]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3 1/2] RISC-V: Define sys_riscv_flush_icache when SMP=n
On Fri, Aug 10, 2018 at 11:27:37AM -0700, Palmer Dabbelt wrote:
> I'm not sure. We can implement the syscall fine in !SMP, it's just that the
> vDSO is expected to always eat these calls because in non-SMP mode you can
> do a global fence.i by just doing a local fence.i (there's only one hart).
>
> The original rationale behind not having the syscall in non-SMP mode was to
> limit the user ABI, but on looking again that seems like it's just a bit of
> extra complexity that doesn't help anything. It's already been demonstrated
> that nothing is checking the error because it's been silently slipping past
> userspace for six months, so the extra complexity seems like it'll just
> cause someone else to have to chase the bug in the future.
>
> But I'm really OK either way. Is there a precedent for what to do here?

I don't know of any.

\
 
 \ /
  Last update: 2018-08-14 15:36    [W:0.063 / U:0.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site