On Tue, Jan 4, 2011 at 1:07 PM, Rajesh S R <srrajesh1989@xxxxxxxxx> wrote: > > > On Tue, Jan 4, 2011 at 11:28 PM, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> > wrote: >> >> On Wed, Jan 5, 2011 at 00:40, mohit verma <mohit89mlnc@xxxxxxxxx> wrote: >> > >> > hi all, >> > i have seen many places in kernel where the variables specially the >> > structures should be of fixed size independent of the architecture. i >> > went >> > through the definitions of them but dint get clearly (or frankly >> > say >> > ...dint get them even a bit) . >> >> Your question isn't specific enough, so I'll just guess. Let's say >> "int". In 32 bit, AFAIK it's 4 byte, but in 64 bit (like IA 64, not >> sure if it's x64) it's 8 byte. So, if you just say "int", you will >> likely getting screwed up. >> >> By using types like u_int or something like that, you pretty much say >> "I mean 4 byte kind of integer" etc > > > Still there can be padding issues due to byte alignment, which may vary > across architecture. Am not sure if that is controllable (probably some > pragma to gcc?). Probably, OP is asking about it? I believe you are referring to __attribute__( ( packed ) ) _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
