Re: sparc_pipe(2)

[Al Viro <viro@ZenIV.linux.org.uk>]

On Mon, Mar 19, 2018 at 09:11:25PM -0400, David Miller wrote:
> From: Al Viro <viro@ZenIV.linux.org.uk>
> Date: Tue, 20 Mar 2018 00:12:24 +0000
> 
> > Am I missing something here, or is it simply that the thing predates
> > current_pt_regs()?
> 
> It probably just predates current_pt_regs(), yes.

OK...  Another fun question in the same area:
asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
{
        if ((int)high < 0)
                return -EINVAL;
        else
                return sys_ftruncate(fd, (high << 32) | low);
}

Is there any reason we want to check high right there?  After all,
sys_ftruncate() will produce exactly that on MSB of its second
argument set...  The same goes for sys32_truncate() - sys_truncate()
will yield -EINVAL on negative loff_t.