Re: Interface for the new fallocate() system call

Heiko Carstens
2007-03-30T07:00:33Z

On Thu, Mar 29, 2007 at 07:01:54PM +0200, Jan Engelhardt wrote:
> Hi,
>
> On Mar 29 2007 17:21, Amit K. Arora wrote:
> >
> >We need to come up with the best possible layout of arguments for the
> >fallocate() system call. Various architectures have different
> >requirements for how the arguments should look like. Since the mail
> >chain has become huge, here is the summary of various inputs received
> >so far.
>
> >s390 prefers following layout:
> > int fallocate(int fd, loff_t offset, loff_t len, int mode)
> >For details on why and how "int, int, loff_t, loff_t" is a problem on
> >s390, please see Heiko's mail on 16th March. Here is the link:
> >http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg133595.html
>
> Quoting that...
> |len -> r6 + second halve on stack
>
> Then, is not this a gcc glitch? (IMO, it should put all of "len" on the
> stack)

It _does_ put all of "len" on the stack. That is what I tried to explain
in the section that follows what you quoted.