ütree 4b3953b84fffb65bdf7b54955aed40d45d538e4a parent 18bcd0c8cb7d85a9063b88ec810dc1cdc0974518 author Steven Rostedt 1301084466 -0400 committer Steven Rostedt 1301321442 -0400 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 Cc: Alexey Dobriyan Signed-off-by: Steven Rostedt º3GÜ7x