Hi,

while trying to figure out why sysv msg is around 30% slower than pipes 
for data transfers I noticed that gcc's autodetection (3.2.2) guesses 
the "if(access_ok())" tests in uaccess.h wrong and puts the error memset 
into the direct path and the copy out of line.

The attached patch adds likely to the tests - any objections? What about 
the archs except i386?

--
    Manfred