lkml.org 
[lkml]   [2013]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] drivers: w1: make w1_slave::flags long to avoid casts
Date
> 01.11.2013, 23:30, "Andrew Morton" <akpm@linux-foundation.org>:
>> set_bit() operates on longs.  So if we do
>>
>> struct foo { u32 a; u32 b; } f;
>> set_bit(0, (long *)&f.a);
>>
>> then we'll scribble on f.b on a big-endian 64-bit machine.

On Sat, Nov 02 2013, Рустафа Джамурахметов <zbr@ioremap.net> wrote:
> Argh, why would we just don't do that? Its in-memory field, it can be
> anything, I wouldn't be surprised if it even can be non-atomic because
> of proper locks already being held

If the driver does not require an atomic set_bit operation for setting
and testing the flag, feel free to prepare a patch replacing the whole
thing with a plain bool.
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2013-11-02 18:21    [W:0.808 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site