cvs commit: src/sys/sparc64/include in_cksum.h

[Marius Strobl]

marius      2008-06-25 21:04:59 UTC

  FreeBSD src repository

  Modified files:
    sys/sparc64/include  in_cksum.h 
  Log:
  SVN rev 180011 on 2008-06-25 21:04:59Z by marius
  
  Use "__asm __volatile" rather than "__asm" for instruction sequences
  that modify condition codes (the carry bit, in this case). Without
  "__volatile", the compiler might add the inline assembler instructions
  between unrelated code which also uses condition codes, modifying the
  latter.
  This prevents the TCP pseudo header checksum calculation done in
  tcp_output() from having effects on other conditions when compiled
  with GCC 4.2.1 at "-O2" and "options INET6" left out. [1]
  
  Reported & tested by:   Boris Kochergin [1]
  MFC after:              3 days
  
  Revision  Changes    Path
  1.4       +7 -7      src/sys/sparc64/include/in_cksum.h