Hi,
Libin Varghese wrote:
>>> #define INIT_LIST_HEAD(ptr) do { \
>>> (ptr)->next = (ptr); (ptr)->prev = (ptr); \
>>> } while (0)
> I understand that it is neccessary for a block of statments, but we are
> they using it for a single statement
(ptr)->next = (ptr); <= First statement.
(ptr)->prev = (ptr); <= Second one.
So, here, there are two statements.
Of course, if there's a single statement, no need to use the do {}
while(0) trick:
#define foo(a) bar(42,a+42)
Sincerly,
Thomas
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Thomas Petazzoni
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