Arnd Bergmann <arnd@xxxxxxxx> 写于 2009-06-14 06:23:06:
> On Saturday 13 June 2009, liqin.chen@xxxxxxxxxxxxx wrote:
> > >
> > > EMAXERRNO is mips specific right now. Do you actually need it
somewhere?
> > >
> >
> > Yes, I used it in entry.S, maybe I could remove this define latter.
> >
>
> Ok. Note that the maximum error number that is supposed to get sent back
> to user space is 511. Most architectures check the return value of the
> system call to be between -4095 and zero upon entering user space.
> Checking it in the kernel gives you the chance to override the
> error status from a system call with force_successful_syscall_return().
>
> If that is your intention, you should probably leave the definition in
there.
> Powerpc uses _LAST_ERRNO for the same purpose, which is somewhat
inconsistent
> with mips and also uses a different value to compare against.
>
Maybe I can don't use EMAXERRNO in score code. But I think define a
maximum error number in asm-generic/errno.h is better.
?韬{.n?????%??檩??w?{.n???{饼??Ф?塄}?财??j:+v?? ? ???2??璀??摺?囤??z夸z罐?+?????w棹f
