linux-kernel - Re: [GIT PULL] Please pull powerpc/linux.git powerpc-5.18-1 tag

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Message-ID: <87k0cbfuf4.fsf@mpe.ellerman.id.au>
Date:   Thu, 31 Mar 2022 00:21:03 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Michal Suchánek <msuchanek@...e.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        wangborong@...rlc.com, Bhaskar Chowdhury <unixbhaskar@...il.com>,
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Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-5.18-1 tag

Michal Suchánek <msuchanek@...e.de> writes:
> On Mon, Mar 28, 2022 at 08:07:13PM +1100, Michael Ellerman wrote:
>> Linus Torvalds <torvalds@...ux-foundation.org> writes:
>> > On Fri, Mar 25, 2022 at 3:25 AM Michael Ellerman <mpe@...erman.id.au> wrote:
>> 
>> > That said:
>> >
>> >> There's a series of commits cleaning up function descriptor handling,
>> >
>> > For some reason I also thought that powerpc had actually moved away
>> > from function descriptors, so I'm clearly not keeping up with the
>> > times.
>> 
>> No you're right, we have moved away from them, but not entirely.
>> 
>> Functions descriptors are still used for 64-bit big endian, but they're
>> not used for 64-bit little endian, or 32-bit.
>
> There was a patch to use ABIv2 for ppc64 big endian. I suppose that
> would rid usof the gunction descriptors for good.

It would be nice.

The hesitation in the past was that the GNU toolchain developers don't
officially support BE+ELFv2, though it is in use so it does work.

> Maybe it's worth resurrecting?

Yeah maybe we should think about it again. If it builds with clang/lld
that would be a real plus.

cheers