From: Ard Biesheuvel <ardb@kernel.org>
To: Mark Rutland <mark.rutland@arm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Heiko Carstens <hca@linux.ibm.com>,
Paul Mackerras <paulus@samba.org>, Borislav Petkov <bp@alien8.de>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>, Ingo Molnar <mingo@redhat.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Keith Packard <keithpac@amazon.com>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Kees Cook <keescook@chromium.org>,
Andy Lutomirski <luto@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
"open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)"
<linuxppc-dev@lists.ozlabs.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
"open list:S390" <linux-s390@vger.kernel.org>
Subject: Re: [RFC PATCH 0/8] Move task_struct::cpu back into thread_info
Date: Tue, 21 Sep 2021 14:06:24 +0200 [thread overview]
Message-ID: <CAMj1kXGPcHwdSjy-doB09LBLvrXtqYT4dyxE5hU=D=2m8Fg8zg@mail.gmail.com> (raw)
In-Reply-To: <20210914135527.GC30247@C02TD0UTHF1T.local>
On Tue, 14 Sept 2021 at 15:55, Mark Rutland <mark.rutland@arm.com> wrote:
>
> On Tue, Sep 14, 2021 at 02:10:28PM +0200, Ard Biesheuvel wrote:
> > Commit c65eacbe290b ("sched/core: Allow putting thread_info into
> > task_struct") mentions that, along with moving thread_info into
> > task_struct, the cpu field is moved out of the former into the latter,
> > but does not explain why.
>
> From what I recall of talking to Andy around that time, when converting
> arm64 over, the theory was that over time we'd move more and more out of
> thread_info and into task_struct or thread_struct, until task_struct
> supplanted thread_info entirely, and that all became generic.
>
> I think the key gain there was making things more *generic*, and there
> are other ways we could do that in future without moving more into
> task_struct (e.g. with a geenric thread_info and arch_thread_info inside
> that).
>
> With that in mind, and given the diffstat, I think this is worthwhile.
>
> FWIW, for the series:
>
> Acked-by: Mark Rutland <mark.rutland@arm.com>
>
Thanks.
Any comments on this from the various arch maintainers? Especially
power, as Christophe seems happy with this but there are 3 different
patches affecting power that need a maintainer ack.
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prev parent reply other threads:[~2021-09-21 12:07 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-14 12:10 [RFC PATCH 0/8] Move task_struct::cpu back into thread_info Ard Biesheuvel
2021-09-14 12:10 ` [RFC PATCH 1/8] arm64: add CPU field to struct thread_info Ard Biesheuvel
2021-09-14 15:41 ` Linus Torvalds
2021-09-14 15:42 ` Ard Biesheuvel
2021-09-16 14:41 ` Catalin Marinas
2021-09-21 12:04 ` Ard Biesheuvel
2021-09-14 12:10 ` [RFC PATCH 2/8] x86: " Ard Biesheuvel
2021-09-21 12:54 ` Borislav Petkov
2021-09-14 12:10 ` [RFC PATCH 3/8] s390: " Ard Biesheuvel
2021-09-28 13:52 ` Ard Biesheuvel
2021-09-14 12:10 ` [RFC PATCH 4/8] powerpc: " Ard Biesheuvel
2021-09-27 15:12 ` Ard Biesheuvel
2021-09-27 23:13 ` Michael Ellerman
2021-09-28 0:16 ` Michael Ellerman
2021-09-28 13:18 ` Ard Biesheuvel
2021-09-29 22:46 ` Michael Ellerman
2021-09-29 23:10 ` Kees Cook
2021-09-30 17:47 ` Kees Cook
2021-10-05 1:55 ` Michael Ellerman
2021-09-14 12:10 ` [RFC PATCH 5/8] sched: move CPU field back into thread_info if THREAD_INFO_IN_TASK=y Ard Biesheuvel
2021-09-14 15:46 ` Linus Torvalds
2021-09-14 15:52 ` Ard Biesheuvel
2021-09-14 15:58 ` Linus Torvalds
2021-09-14 16:10 ` Ard Biesheuvel
2021-09-21 13:12 ` Catalin Marinas
2021-09-14 12:10 ` [RFC PATCH 6/8] powerpc: smp: remove hack to obtain offset of task_struct::cpu Ard Biesheuvel
2021-09-14 12:10 ` [RFC PATCH 7/8] riscv: rely on core code to keep thread_info::cpu updated Ard Biesheuvel
2021-09-28 22:07 ` Palmer Dabbelt
2021-09-14 12:10 ` [RFC PATCH 8/8] ARM: " Ard Biesheuvel
2021-09-14 13:49 ` [RFC PATCH 0/8] Move task_struct::cpu back into thread_info Christophe Leroy
2021-09-14 13:55 ` Mark Rutland
2021-09-21 12:06 ` Ard Biesheuvel [this message]
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