tree ecf26fe7da3e261e81a878942604aca3c9fe7e2d
parent 007d77d0c5eb36555443ff273ce2a27f90da8837
author Chen, Kenneth W <kenneth.w.chen@intel.com> 1163032165 -0800
committer Tony Luck <tony.luck@intel.com> 1165519199 -0800

[IA64] tidy up return value of ip_fast_csum

While working on implementing csum_ipv6_magic, I noticed that current
version of ip_fast_csum will potentially return bits above "unsigned
short" as 1.  While no harm is done right now because all call sites
will chop off the upper bits when it uses the return value.  However,
this is still dangerous and buggy.  Here is a patch to enforce that the
function really returns unsigned short in the native register format.

The fix is free as there are plenty open slot to add one more asm instruction.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>