Re: [PATCH v12 0/6] implement getrandom() in vDSO

Eric Biggers
2022-12-20T20:13:16Z

On Tue, Dec 20, 2022 at 05:17:52PM +0000, Christophe Leroy wrote:
> Hi Jason,
>
> Le 12/12/2022 à 19:53, Jason A. Donenfeld a écrit :
> > Changes v11->v12:
> > ----------------
> > - In order to avoid mlock()ing pages, and the related rlimit and fork
> > inheritance issues there, Introduce VM_DROPPABLE to prevent swapping
> > while meeting the cache-like requirements of vDSO getrandom().
> >
> > This has some tenticles in mm/ and arch/x86/ code, so I've marked the
> > two patches for that as still RFC, while the rest of the series is not
> > RFC.
> >
> > - Mandate that opaque state blobs don't straddle page boundaries, so
> > that VM_DROPPABLE can work on page-level granularity rather than
> > allocation-level granularity.
> >
> > - Add compiler barriers to vDSO getrandom() to prevent theoretical
> > reordering potential.
> >
> > - Initialize the trials loop counter in the chacha test.
>
> I would have liked to give it a try on powerpc, but the series
> conflicts. I tried both on v6.1 and on linus/master from now:
>

Same here, I can't figure out how to apply this series.

It would help if people always used the --base option to git format-patch...

- Eric