File system query

[Dibyayan Chakraborty]

Hi,
I came by a really weird macro code in
linux/jbd.h<http://lxr.free-electrons.com/source/include/linux/jbd.h#L1029>which
is

BUFFER_TRACE(bh,info)  do{} while(0).

Please explain the necessity of this.

-- 
With Regards
Dibyayan Chakraborty
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