lkml.org 
[lkml]   [2008]   [Jan]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subjectmacro _set_base - "do - while(0)" question
Hi,

In file include/asm-i386/system.h, _set_base and _set_limit use an
useless do ... while(0)

Why is this needed ?

exemple with _set_base from linux-2.6.23

#define _set_base(addr,base) do { unsigned long __pr; \
__asm__ __volatile__ ("movw %%dx,%1\n\t" \
"rorl $16,%%edx\n\t" \
"movb %%dl,%2\n\t" \
"movb %%dh,%3" \
:"=&d" (__pr) \
:"m" (*((addr)+2)), \
"m" (*((addr)+4)), \
"m" (*((addr)+7)), \
"0" (base) \
); } while(0)


--
Abdel
http://draconux.free.fr/


\
 
 \ /
  Last update: 2008-01-02 12:49    [W:0.033 / U:3.380 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site