K 10
svn:author
V 3
dim
K 8
svn:date
V 27
2012-01-02T12:50:19.612807Z
K 7
svn:log
V 1240
MFC r228779:

  Start selectively disabling a few kernel build warnings for clang, since
  there are some places in the kernel where fixing them is too disruptive,
  or where there is a false positive.

  In this case, disable -Wconstant-conversion for two aic7xxx-related
  files, as they get the following warning on i386 (and possibly on other
  32-bit arches):

  sys/dev/aic7xxx/ahc_pci.c:112:10: warning: implicit conversion from 'long long' to 'bus_addr_t' (aka 'unsigned int') changes value from 549755813887 to 4294967295 [-Wconstant-conversion]
                                     ? 0x7FFFFFFFFFLL
                                     ~~^~~~~~~~~~~~~~

  This is a false positive, since the code only passes the 0x7FFFFFFFFFLL
  argument, if sizeof(bus_addr_t) is larger than 4 (e.g. on 64 bit arches,
  or when PAE is enabled on i386).  The code could be refactored to do
  compile-time checks, but that is more disruptive.

MFC r228789:

  Amend r228779 by also disabling -Wconstant-conversion warnings for the
  aic7xxx module.

MFC r228805:

  Disable -Wconstant-conversion warnings for the aic7xxx module in a more
  fine-grained way: only add the option for the specific .c files that
  need them, like via sys/conf/files.

END