lkml.org 
[lkml]   [2014]   [Dec]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 00/18] uaccess: fix sparse warning on get_user for bitwise types
From
Date
On Sun, 2014-12-14 at 18:51 +0200, Michael S. Tsirkin wrote:
> At the moment, if p and x are both tagged as bitwise types,
> get_user(x, p) produces a sparse warning on many architectures.
> This is because *p on these architectures is loaded into long
> (typically using asm), then cast back to typeof(*p).
>
> When typeof(*p) is a bitwise type (which is uncommon), such a cast needs
> __force, otherwise sparse produces a warning.

What does __force actually mean? Force the cast even though it's a bitfield? Or
does it mean more than that?

ie. are we loosing the ability to detect any actual errors by adding force?

cheers




\
 
 \ /
  Last update: 2014-12-15 02:21    [W:0.171 / U:0.240 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site