Re: Return value of __mm_populate

[Marco Stornelli]

Hi,

Il 14/04/2013 02:18, KOSAKI Motohiro ha scritto:
> (4/13/13 5:14 AM), Marco Stornelli wrote:
> > Hi,
> >
> > I was seeing the code of __mm_populate (in -next) and I've got a doubt
> > about the return value. The function __mlock_posix_error_return should
> > return a proper error for mlock, converting the return value from
> > __get_user_pages. It checks for EFAULT and ENOMEM. Actually
> > __get_user_pages could return, in addition, ERESTARTSYS and EHWPOISON.
>
> __get_user_pages doesn't return EHWPOISON if FOLL_HWPOISON is not specified.
> I'm not expert ERESTARTSYS. I understand correctly, ERESTARTSYS is only returned
> when signal received, and signal handling routine (e.g. do_signal) modify EIP and
> hidden ERESTARTSYS from userland generically.

Yep, you're right, the "magic" is inside the signal management. Thanks!!

Marco
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