On 23 June 2013 17:18, Dibyayan Chakraborty <dib.coolguy@xxxxxxxxx> wrote:
> Hi,
> I came by a really weird macro code in linux/jbd.h which is
>
> BUFFER_TRACE(bh,info) do{} while(0).
>
> Please explain the necessity of this.
I'm not familiar with that specific code, but it looks like a "no op"
macro. Maybe the definition is the to ensure backwards or forward
compatibility for the code that calls the macro , but now it doesn't
do anything.
For the reason why there is a while(0), instead of just no code there,
take a look at this:
http://kernelnewbies.org/FAQ/DoWhile0
Hope this helps.
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