lkml.org 
[lkml]   [2018]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/7] RDMA/qedr: eliminate duplicate barriers on weakly-ordered archs
On 2018-03-14 00:12, Jason Gunthorpe wrote:
> On Tue, Mar 13, 2018 at 11:20:24PM -0400, Sinan Kaya wrote:
>> Code includes wmb() followed by writel() in multiple places. writel()
>> already has a barrier on some architectures like arm64.
>>
>> This ends up CPU observing two barriers back to back before executing
>> the
>> register write.
>>
>> Since code already has an explicit barrier call, changing writel() to
>> writel_relaxed().
>>
>> Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
>> drivers/infiniband/hw/qedr/verbs.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> Sure matches my understanding of writel_relaxed
>
> This is part of a series, should we take just this patch through the
> rdma tree? If not:
>
> Acked-by: Jason Gunthorpe <jgg@mellanox.com>

Feel free to take pieces.


>
> Thanks,
> Jason

\
 
 \ /
  Last update: 2018-03-14 13:07    [W:0.055 / U:0.872 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site