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SubjectRe: [PATCH 22/27] score: create kernel files signal.c sys_score.c time.c
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linux-arch-owner@vger.kernel.org 写于 2009-06-10 01:52:47:

> On Tuesday 09 June 2009, liqin.chen@sunplusct.com wrote:
> > +asmlinkage long sys_mmap(unsigned long addr, size_t len,
> > + unsigned long prot, unsigned long flags,
> > + unsigned long fd, off_t offset)
> > +{
> > + int err = -EINVAL;
> > +
> > + if (offset & ~PAGE_MASK) {
> > + printk(KERN_INFO "no pagemask in mmap\r\n");
> > + goto out;
> > + }
> > +
> > + err = sys_mmap2(addr, len, prot, flags, fd, offset >>
PAGE_SHIFT);
> > +out:
> > + return err;
> > +}

> A 32 bit kernel should only need sys_mmap2, not sys_mmap, because it is
> trivial to convert in user space.
>
> > +
> > +asmlinkage long score_vfork(struct pt_regs *regs)
> > +{
> > + return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
regs->regs[0],
> > + regs, 0, NULL, NULL);
> > +}
> > +
> > +/*
> > + * Fork a new task - this creates a new program thread.
> > + * This is called indirectly via a small wrapper
> > + */
> > +asmlinkage int
> > +score_fork(struct pt_regs *regs)
> > +{
> > + return do_fork(SIGCHLD, regs->regs[0], regs, 0, NULL, NULL);
> > +}
>
> Similarly, you should not need vfork and fork any more, because they can
> be handled in user space through clone().
>

OK, I remove these from my code.

Best Regards
liqin
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