Re: [Patch 1/2] ia32: use generic sys_pipe()

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

On Tue, Aug 04, 2009 at 02:24:32PM +0200, Ingo Molnar wrote:

> Please _ALWAYS_ mention the change in behavior in the changelog, 
> just in case someone ends up bisecting it. I only found out when i 
> reviewed the two syscalls out of caution.
> 
> The syscall you remove kept stale fd's around in case of -EFAULT 
> from copy_to_user(). The generic version does an explicit close of 
> those files:
> 
>                         sys_close(fd[0]);
>                         sys_close(fd[1]);
>                         error = -EFAULT;

> The generic version looks like the better choice to me but this 
> difference should be mentioned in the changelog nevertheless, just 
> in case some buggy app runs into this issue.

It's not a matter of QOI, actually - sys32_pipe() is supposed to do what
sys_pipe() would do on i386 host.  So any difference in handling of an
error case is simply wrong.

Whether we want those sys_close() in sys_pipe() or not is a separate
question, but we definitely want the same behaviour when 32bit process is
run natively and when it's run on amd64.  So sys32_pipe() has no business
existing at all.