Discontiguous memory and cacheflush
From: Russell King - ARM Linux <hidden>
Date: 2012-08-16 09:19:53
On Thu, Aug 16, 2012 at 09:27:26AM +0100, Dave Martin wrote:
Could we use the currently must-be-zero flags parameter to add new functionality to this syscall, or are there legacy uses of that parameter (or history of userspace not bothering to zero it?) For example, we could have something like do_cache_op(struct iovec *iov, int iovcnt, CF_IOVEC) to flush a discontiguous set of ranges described by an iovec (though we can of course also describe the ranges in other ways)
Why overload an existing syscall with multiple different argument types rather than having a new syscall with a sane API?