lkml.org 
[lkml]   [2018]   [Mar]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v3 18/18] infiniband: cxgb4: Eliminate duplicate barriers on weakly-ordered archs
From
From: Sinan Kaya <okaya@codeaurora.org>
Date: Sat, 17 Mar 2018 00:25:14 -0400

> I think I finally got what you mean.
>
> Code seems to have
>
> wmb()
> writel()/writeq()
> wmb()
>
> this can be safely replaced with
>
> wmb()
> __raw_writel()/__raw_writeq()
> wmb()
>
> This will work on all arches. Below is the new version. Let me know if this is OK.

Unfortunately, I think this won't work.

At least on sparc, the __raw_*() variants also change the endianness to
native endianness.

PowerPC does this as well, even documented in a comment :-)

/*
* Non ordered and non-swapping "raw" accessors
*/

Only the non-__raw_ variants do the endianness swap to/from
little-endian.

\
 
 \ /
  Last update: 2018-03-17 14:29    [W:0.053 / U:0.272 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site