From: Will Deacon <will.deacon@arm.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>,
peterz@infradead.org, mingo@redhat.com, mcgrof@kernel.org,
viro@zeniv.linux.org.uk, sfr@canb.auug.org.au,
nicolas.dichtel@6wind.com, rmk+kernel@armlinux.org.uk,
msalter@redhat.com, tklauser@distanz.ch, james.hogan@imgtec.com,
paul.gortmaker@windriver.com, linux@roeck-us.net,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
albert@sifive.com, patches@groups.riscv.org,
mathieu.desnoyers@efficios.com
Subject: Re: [PATCH 8/9] RISC-V: User-facing API
Date: Thu, 6 Jul 2017 16:45:13 +0100 [thread overview]
Message-ID: <20170706154512.GD15574@arm.com> (raw)
In-Reply-To: <20170706153427.GA30746@infradead.org>
On Thu, Jul 06, 2017 at 08:34:27AM -0700, Christoph Hellwig wrote:
> On Thu, Jul 06, 2017 at 09:55:03AM +0100, Will Deacon wrote:
> > Agreed on the indirection; it feels like this is something that should be in
> > the vDSO, which could use the cmpxchg instruction if it's available, or
> > otherwise just uses plain loads and stores.
>
> Even that seems like a lot of indirection for something that is in
> the critical fast path for synchronization. I really can't understand
> how a new ISA / ABI could even come up with an idea as stupid as making
> essential synchronization primitives optional.
No disagreement there!
Will
next prev parent reply other threads:[~2017-07-06 15:45 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-04 19:50 RISC-V Linux Port v4 Palmer Dabbelt
2017-07-04 19:50 ` [PATCH 1/9] RISC-V: Init and Halt Code Palmer Dabbelt
[not found] ` <alpine.DEB.2.20.1707042224560.2131@nanos>
2017-07-04 21:17 ` [patches] " Karsten Merker
2017-07-05 6:39 ` Thomas Gleixner
2017-07-04 21:54 ` [patches] " Jonathan Neuschäfer
2017-07-06 22:34 ` Palmer Dabbelt
2017-07-07 12:58 ` Jonathan Neuschäfer
2017-07-10 20:39 ` Palmer Dabbelt
2017-07-04 19:50 ` [PATCH 2/9] RISC-V: Atomic and Locking Code Palmer Dabbelt
2017-07-05 8:43 ` Peter Zijlstra
2017-07-06 11:08 ` Boqun Feng
2017-07-06 7:26 ` Peter Zijlstra
2017-07-07 1:04 ` Palmer Dabbelt
2017-07-07 2:14 ` Boqun Feng
2017-07-10 20:39 ` Palmer Dabbelt
2017-07-07 8:08 ` Peter Zijlstra
2017-07-10 20:39 ` Palmer Dabbelt
2017-07-06 10:33 ` Boqun Feng
2017-07-07 13:16 ` [patches] " Jonathan Neuschäfer
2017-07-10 20:39 ` Palmer Dabbelt
2017-07-04 19:50 ` [PATCH 3/9] RISC-V: Generic library routines and assembly Palmer Dabbelt
2017-07-04 19:50 ` [PATCH 4/9] RISC-V: ELF and module implementation Palmer Dabbelt
2017-07-04 19:50 ` [PATCH 5/9] RISC-V: Task implementation Palmer Dabbelt
2017-07-04 19:50 ` [PATCH 6/9] RISC-V: Device, timer, IRQs, and the SBI Palmer Dabbelt
2017-07-04 19:51 ` [PATCH 7/9] RISC-V: Paging and MMU Palmer Dabbelt
2017-07-04 19:51 ` [PATCH 8/9] RISC-V: User-facing API Palmer Dabbelt
2017-07-05 10:24 ` James Hogan
2017-07-06 2:01 ` Christoph Hellwig
2017-07-06 8:55 ` Will Deacon
2017-07-06 15:34 ` Christoph Hellwig
2017-07-06 15:45 ` Will Deacon [this message]
[not found] ` <mhng-f92ef7c4-049a-4a71-be12-c600d1d7858b@palmer-si-x1c4>
2017-07-10 20:18 ` Palmer Dabbelt
2017-07-11 13:22 ` Will Deacon
2017-07-11 13:55 ` Christoph Hellwig
2017-07-11 17:28 ` Palmer Dabbelt
2017-07-11 17:07 ` Palmer Dabbelt
2017-07-06 15:34 ` Dave P Martin
2017-07-04 19:51 ` [PATCH 9/9] RISC-V: Build Infastructure Palmer Dabbelt
-- strict thread matches above, loose matches on Subject: below --
2017-06-06 22:59 RISC-V Linux Port v2 Palmer Dabbelt
2017-06-28 18:55 ` RISC-V Linux Port v3 Palmer Dabbelt
2017-06-28 18:55 ` [PATCH 8/9] RISC-V: User-facing API Palmer Dabbelt
2017-06-28 21:49 ` Thomas Gleixner
2017-06-28 21:52 ` Thomas Gleixner
2017-06-29 17:22 ` Palmer Dabbelt
2017-06-28 22:42 ` James Hogan
2017-06-29 21:42 ` Palmer Dabbelt
2017-07-03 23:06 ` James Hogan
2017-07-05 16:49 ` Palmer Dabbelt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170706154512.GD15574@arm.com \
--to=will.deacon@arm.com \
--cc=albert@sifive.com \
--cc=hch@infradead.org \
--cc=james.hogan@imgtec.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=mathieu.desnoyers@efficios.com \
--cc=mcgrof@kernel.org \
--cc=mingo@redhat.com \
--cc=msalter@redhat.com \
--cc=nicolas.dichtel@6wind.com \
--cc=palmer@dabbelt.com \
--cc=patches@groups.riscv.org \
--cc=paul.gortmaker@windriver.com \
--cc=peterz@infradead.org \
--cc=rmk+kernel@armlinux.org.uk \
--cc=sfr@canb.auug.org.au \
--cc=tklauser@distanz.ch \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).