diff options
author | Steven Rostedt <srostedt@redhat.com> | 2011-03-25 21:21:06 +0100 |
---|---|---|
committer | Steven Rostedt <rostedt@goodmis.org> | 2011-03-28 16:10:42 +0200 |
commit | ccd0d44fad38dc1bb4b26dcc7a30e9f2c3b36870 (patch) | |
tree | 4b3953b84fffb65bdf7b54955aed40d45d538e4a /arch/ia64/sn/kernel/irq.c | |
parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg... (diff) | |
download | linux-ccd0d44fad38dc1bb4b26dcc7a30e9f2c3b36870.tar.xz linux-ccd0d44fad38dc1bb4b26dcc7a30e9f2c3b36870.zip |
WARN_ON_SMP(): Add comment to explain ({0;})
The define to use ({0;}) for the !CONFIG_SMP case of WARN_ON_SMP()
can be confusing. As the WARN_ON_SMP() needs to be a nop when
CONFIG_SMP is not set, including all its parameters must not be
evaluated, and that it must work as both a stand alone statement
and inside an if condition, we define it to a funky ({0;}).
A simple "0" will not work as it causes gcc to give the warning that
the statement has no effect.
As this strange definition has raised a few eyebrows from some
major kernel developers, it is wise to document why we create such
a work of art.
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'arch/ia64/sn/kernel/irq.c')
0 files changed, 0 insertions, 0 deletions