Re: [RFC PATCH 4/4] powerpc/64: Remove support for kernel's built with ELFv1 ABI

From: "Nicholas Piggin" <npiggin@gmail.com>
To: "Christophe Leroy" <christophe.leroy@csgroup.eu>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [RFC PATCH 4/4] powerpc/64: Remove support for kernel's built with ELFv1 ABI
Date: Tue, 09 May 2023 18:25:18 +1000	[thread overview]
Message-ID: <CSHLQGQA5FL9.2Y9YRT25EOJ0W@wheely> (raw)
In-Reply-To: <28e90ac6-ae84-b0cd-1c3d-d5d93701b8cc@csgroup.eu>

On Fri May 5, 2023 at 6:49 PM AEST, Christophe Leroy wrote:
>
>
> Le 05/05/2023 à 09:18, Nicholas Piggin a écrit :
> > User code must still support ELFv1, e.g., see is_elf2_task().
> > 
> > This one should wait a while until ELFv2 fallout settles, so
> > just posting it out of interest.
>
> Can't ELFv1 user code run on an ELFv2 kernel ?

Yes it can and that's what ELFv2 BE kernels do because most BE userspace
is ELFv1 (although some are using ELFv2 BE).

By ELFv2 fallout I mean bugs and toolchain problems that might get
discovered after we flip the default. I think it would be good to keep
the ELFv1 option around for a few releases to help testing such issues,
the revert will probably pick up conflicts. Maybe that's being too
paranoid.

Thanks,
Nick