Re: [PATCH][2.6] IBM PowerPC Virtual Ethernet Driver

[Keith Owens]

On Wed, 18 Feb 2004 11:45:20 +1100, 
Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> wrote:
>BITFIELDS ARE EVIL !!!
>The compiler is perfectly free, afaik, to re-order them

Not it is not.  C standard (ISO/IEC 9899:1999 (E)), section 6.7.2.1.

10 ...  If enough space remains, a bit-field that immediately follows
   another bit-field in a structure shall be packed into adjacent bits
   of the same unit. ...

13 Within a structure object, the non-bit-field members and the units
   in which bit-fields reside have addresses that increase in the order
   in which they are declared. ...

There is no scope for a compiler to reorder the members or the bit
fields of a structure.

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