use bit field or kernel *_bit()

[Ming Zhang <mingz@xxxxxxxxxxx>]

Hi folks

In kernel code, if we want to represent some bits, like buffer_head
state, we at least can use 2 ways

one is c bit field like

struct x{
int bita:1;
int bitb:1;
...

}

or use a unsigned long xyz, and use test_bit, set_bit, clear_bit to work
on it.

then the question is when we should use which way? thanks!

Ming



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