lkml.org 
[lkml]   [2011]   [Aug]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Question with "container_of(ptr, type, member)"
On 30/08/11 20:44, peter wrote:
> I have a question about the macro " container_of(ptr, type, member) "
> I can write it as this,
> #define container_of(ptr, type, member) ({ \
> (type *) ((char *) ptr - offset_of(type, member)); \
> })
> It can act the same as
> #define container_of(ptr, type, member) ({ \
> const typeof( ((type *)0)->member ) *__mptr = (ptr); \
> (type *)( (char *)__mptr - offsetof(type,member) );})
> So why we don't use the first one ?
> Thanks for your answer.
> (I am a kernel newbie ,and sorry for my poor english~)

The version used by the Linux kernel does type checking.

~Ryan



\
 
 \ /
  Last update: 2011-08-31 01:17    [W:0.699 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site