From: Michael Ellerman <mpe@ellerman.id.au>
To: "Michal Suchánek" <msuchanek@suse.de>
Cc: Paul Menzel <pmenzel@molgen.mpg.de>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
jniethe5@gmail.com, ganeshgr@linux.ibm.com,
wangborong@cdjrlc.com, bigunclemax@gmail.com,
Miroslav Benes <mbenes@suse.cz>,
hbh25y@gmail.com, mikey@neuling.org,
Joe Lawrence <joe.lawrence@redhat.com>,
Bhaskar Chowdhury <unixbhaskar@gmail.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Helge Deller <deller@gmx.de>,
danielhb413@gmail.com, haren@linux.ibm.com,
mamatha4@linux.vnet.ibm.com, Corentin Labbe <clabbe@baylibre.com>,
Wedson Almeida Filho <wedsonaf@google.com>,
"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
Thierry Reding <treding@nvidia.com>,
kernel.noureddine@gmail.com, nathanl@linux.ibm.com,
Petr Mladek <pmladek@suse.com>,
YueHaibing <yuehaibing@huawei.com>,
Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
guozhengkui@vivo.com, kjain@linux.ibm.com,
chenjingwen6@huawei.com, Nick Piggin <npiggin@gmail.com>,
oss@buserror.net, rmclure@linux.ibm.com, maddy@linux.ibm.com,
Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
psampat@linux.ibm.com, sachinp@linux.ibm.com,
Anders Roxell <anders.roxell@linaro.org>,
ldufour@linux.ibm.com, hbathini@linux.ibm.com,
Athira Jajeev <atrajeev@linux.vnet.ibm.com>,
farosas@linux.ibm.com, Geoff Levand <geoff@infradead.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Randy Dunlap <rdunlap@infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
sourabhjain@linux.ibm.com, Julia Lawall <Julia.Lawall@inria.fr>,
Ritesh Harjani <riteshh@linux.ibm.com>,
cgel.zte@gmail.com, Vaibhav Jain <vaibhav@linux.ibm.com>,
tobias@waldekranz.com,
Linus Torvalds <torvalds@linux-foundation.org>,
Jakob Koschel <jakobkoschel@gmail.com>
Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-5.18-1 tag
Date: Thu, 31 Mar 2022 00:21:03 +1100 [thread overview]
Message-ID: <87k0cbfuf4.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <20220330112733.GG163591@kunlun.suse.cz>
Michal Suchánek <msuchanek@suse.de> writes:
> On Mon, Mar 28, 2022 at 08:07:13PM +1100, Michael Ellerman wrote:
>> Linus Torvalds <torvalds@linux-foundation.org> writes:
>> > On Fri, Mar 25, 2022 at 3:25 AM Michael Ellerman <mpe@ellerman.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
WARNING: multiple messages have this Message-ID (diff)
From: Michael Ellerman <mpe@ellerman.id.au>
To: "Michal Suchánek" <msuchanek@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
wangborong@cdjrlc.com, Bhaskar Chowdhury <unixbhaskar@gmail.com>,
Wedson Almeida Filho <wedsonaf@google.com>,
Petr Mladek <pmladek@suse.com>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
jniethe5@gmail.com, psampat@linux.ibm.com,
Miroslav Benes <mbenes@suse.cz>,
hbh25y@gmail.com, mikey@neuling.org,
Joe Lawrence <joe.lawrence@redhat.com>,
Anders Roxell <anders.roxell@linaro.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Helge Deller <deller@gmx.de>,
danielhb413@gmail.com, haren@linux.ibm.com,
Thierry Reding <treding@nvidia.com>,
ganeshgr@linux.ibm.com, Corentin Labbe <clabbe@baylibre.com>,
mamatha4@linux.vnet.ibm.com,
"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
kernel.noureddine@gmail.com, nathanl@linux.ibm.com,
Paul Menzel <pmenzel@molgen.mpg.de>,
YueHaibing <yuehaibing@huawei.com>,
Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
guozhengkui@vivo.com, kjain@linux.ibm.com,
chenjingwen6@huawei.com, Nick Piggin <npiggin@gmail.com>,
oss@buserror.net, rmclure@linux.ibm.com, maddy@linux.ibm.com,
Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
Jakob Koschel <jakobkoschel@gmail.com>,
sachinp@linux.ibm.com, bigunclemax@gmail.com,
ldufour@linux.ibm.com, hbathini@linux.ibm.com,
Athira Jajeev <atrajeev@linux.vnet.ibm.com>,
farosas@linux.ibm.com, Geoff Levand <geoff@infradead.org>,
Randy Dunlap <rdunlap@infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
sourabhjain@linux.ibm.com, Julia Lawall <Julia.Lawall@inria.fr>,
Ritesh Harjani <riteshh@linux.ibm.com>,
cgel.zte@gmail.com, Vaibhav Jain <vaibhav@linux.ibm.com>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
tobias@waldekranz.com
Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-5.18-1 tag
Date: Thu, 31 Mar 2022 00:21:03 +1100 [thread overview]
Message-ID: <87k0cbfuf4.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <20220330112733.GG163591@kunlun.suse.cz>
Michal Suchánek <msuchanek@suse.de> writes:
> On Mon, Mar 28, 2022 at 08:07:13PM +1100, Michael Ellerman wrote:
>> Linus Torvalds <torvalds@linux-foundation.org> writes:
>> > On Fri, Mar 25, 2022 at 3:25 AM Michael Ellerman <mpe@ellerman.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
next prev parent reply other threads:[~2022-03-30 13:22 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-25 10:25 [GIT PULL] Please pull powerpc/linux.git powerpc-5.18-1 tag Michael Ellerman
2022-03-25 10:25 ` Michael Ellerman
2022-03-25 16:49 ` Linus Torvalds
2022-03-25 16:49 ` Linus Torvalds
2022-03-28 9:07 ` Michael Ellerman
2022-03-28 9:07 ` Michael Ellerman
2022-03-30 11:27 ` Michal Suchánek
2022-03-30 11:27 ` Michal Suchánek
2022-03-30 13:21 ` Michael Ellerman [this message]
2022-03-30 13:21 ` Michael Ellerman
2022-03-30 13:44 ` Arnd Bergmann
2022-03-30 13:44 ` Arnd Bergmann
2022-03-30 17:07 ` Segher Boessenkool
2022-03-30 17:07 ` Segher Boessenkool
2022-03-25 17:18 ` pr-tracker-bot
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