With clang 15, the following -Werror warning is produced:
sys/dev/mthca/mthca_cmd.c:662:23: error: variable 'tc' set but not used [-Werror,-Wunused-but-set-variable]
int ts __unused = 0, tc = 0;
^
The 'ts' and 'tc' variables are eventually used only in mthca_dbg()
macros, if CONFIG_INFINIBAND_MTHCA_DEBUG is defined. Ensure 'ts' and
'tc' are only declared and used when CONFIG_INFINIBAND_MTHCA_DEBUG is
defined.
MFC after: 3 days
Since commit 8fa6abb6f4 ("Expose clang's alignment builtins and use
them for roundup2/rounddown2"), clang emits warnings for several
alignment operations in these drivers because the operation is a no-op.
The compiler is arguably being too strict here, but in the meantime
let's silence the warnings by conditionally compiling the alignment
operations.
Reviewed by: arichardson, hselasky
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D28576
compilation under FreeBSD. The mthca driver was temporarily removed as
part of the Linux 4.9 RoCE/infinband upgrade.
Top commit in Linux source tree:
69973b830859bc6529a7a0468ba0d80ee5117826
Sponsored by: Mellanox Technologies
