Alan Cox wrote:
> > Does kmalloc() make any guarantees of the alignment of allocated
> > blocks? Will the returned block always be 4-, 8- or 16-byte
> > aligned, for example?
> There are people who assume 16byte alignment guarantees. I dont
> think anyone has formally specified the guarantee beyond 4 bytes tho
What does "formally specified" mean?
As far as I know, you can count on 16-bytes alignment from
kmalloc. The trouble is that you would have to keep the original
pointer and free that if you have to do the "round" yourself.
I once wrote a kmalloc(*) that would allow you to free any pointer
inside the kmalloc-ed area. This is dangerous as freeing a random
pointer is more likely to "work". But in this case it would be very
convenient.
Roger.
(*) Too buggy for anyone but me.
-- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 ** *-- BitWizard writes Linux device drivers for any device you may have! --* * There are old pilots, and there are bold pilots. * There are also old, bald pilots. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Wed Mar 07 2001 - 21:00:16 EST