From: Mikulas Patocka <mpatocka@redhat.com>
To: "Maciej W. Rozycki" <macro@wdc.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
"Maciej W. Rozycki" <macro@linux-mips.org>,
Arnd Bergmann <arnd@arndb.de>,
Richard Henderson <rth@twiddle.net>,
Matt Turner <mattst88@gmail.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
alpha <linux-alpha@vger.kernel.org>,
linux-serial@vger.kernel.org, linux-rtc@vger.kernel.org
Subject: Re: [PATCH v5] alpha: fix memory barriers so that they conform to the specification
Date: Tue, 26 May 2020 10:48:49 -0400 (EDT) [thread overview]
Message-ID: <alpine.LRH.2.02.2005261044440.29117@file01.intranet.prod.int.rdu2.redhat.com> (raw)
In-Reply-To: <alpine.LFD.2.21.2005251729110.21168@redsun52.ssa.fujisawa.hgst.com>
On Mon, 25 May 2020, Maciej W. Rozycki wrote:
> On Mon, 25 May 2020, Mikulas Patocka wrote:
>
> > > > The functions __raw_read* are already extern inline, so the compiler will
> > > > inline/noinline them depending on the macros trivial_io_bw and
> > > > trivial_io_lq - so we can just call them from read*_relaxed without
> > > > repeating the extern inline pattern.
> > >
> > > The whole point of this peculiar arrangement for cooked accessors is to
> > > avoid having barriers inserted inline around out-of-line calls to raw
> > > accessors,
> >
> > I see, but why do we want to avoid that? Linux kernel has no binary
> > compatibility, so it doesn't matter if the barriers are inlined in the
> > drivers or not.
>
> It does matter as it expands code unnecessarily (at all call sites), as I
> noted in the original review. This has nothing to do with compatibility.
>
> > Anyway, I've sent a next version of the patch that makes read*_relaxed
> > extern inline.
>
> Thanks, I'll have a look. And now that you have this update, please run
> `size' on ALPHA_GENERIC `vmlinux', preferably monolithic, to see what the
> difference is between `read*_relaxed' handlers `static inline' and keyed
> with `*trivial_rw_*'.
>
> Maciej
The patch with static inline:
text data bss dec hex filename
124207762 75953010 5426432 205587204 c410304 vmlinux
The patch with extern inline:
text data bss dec hex filename
124184422 75953474 5426432 205564328 c40a9a8 vmlinux
(I've sent version 7 of the patch because I misnamed the "write_relaxed"
function in version 6).
Mikulas
next prev parent reply other threads:[~2020-05-26 14:48 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-06 11:21 [PATCH 1/2] alpha: add a delay between RTC port write and read Mikulas Patocka
2020-05-06 14:20 ` Arnd Bergmann
2020-05-06 17:12 ` [PATCH 1/2 v2] alpha: add a delay to inb_p, inb_w and inb_l Mikulas Patocka
2020-05-07 8:06 ` [PATCH 1/2 v3] " Mikulas Patocka
2020-05-07 8:20 ` Greg Kroah-Hartman
2020-05-07 10:53 ` Mikulas Patocka
2020-05-07 13:30 ` Arnd Bergmann
2020-05-07 14:09 ` Mikulas Patocka
2020-05-07 15:08 ` Arnd Bergmann
2020-05-07 15:45 ` Mikulas Patocka
2020-05-07 15:46 ` [PATCH v4] alpha: add a barrier after outb, outw and outl Mikulas Patocka
2020-05-07 19:12 ` Arnd Bergmann
2020-05-10 1:27 ` Maciej W. Rozycki
2020-05-10 1:25 ` [PATCH 1/2 v3] alpha: add a delay to inb_p, inb_w and inb_l Maciej W. Rozycki
2020-05-10 18:50 ` Mikulas Patocka
2020-05-11 14:58 ` Maciej W. Rozycki
2020-05-12 19:35 ` Mikulas Patocka
2020-05-13 14:41 ` Ivan Kokshaysky
2020-05-13 16:13 ` Greg Kroah-Hartman
2020-05-13 17:17 ` Maciej W. Rozycki
2020-05-22 13:03 ` Mikulas Patocka
2020-05-22 13:37 ` Maciej W. Rozycki
2020-05-22 13:26 ` Mikulas Patocka
2020-05-22 20:00 ` Mikulas Patocka
2020-05-23 10:26 ` [PATCH v4] alpha: fix memory barriers so that they conform to the specification Mikulas Patocka
2020-05-23 15:10 ` Ivan Kokshaysky
2020-05-23 15:34 ` Mikulas Patocka
2020-05-23 15:37 ` [PATCH v5] " Mikulas Patocka
2020-05-24 14:54 ` Maciej W. Rozycki
2020-05-25 13:56 ` Mikulas Patocka
2020-05-25 14:07 ` Arnd Bergmann
2020-05-25 14:45 ` Maciej W. Rozycki
2020-05-25 15:53 ` [PATCH v6] " Mikulas Patocka
2020-05-26 14:47 ` [PATCH v7] " Mikulas Patocka
2020-05-27 0:18 ` Maciej W. Rozycki
2020-06-08 6:58 ` Mikulas Patocka
2020-06-08 23:49 ` Matt Turner
2020-05-25 15:54 ` [PATCH v5] " Mikulas Patocka
2020-05-25 16:39 ` Maciej W. Rozycki
2020-05-26 14:48 ` Mikulas Patocka [this message]
2020-05-27 0:23 ` Maciej W. Rozycki
2020-05-23 16:44 ` [PATCH v4] " Maciej W. Rozycki
2020-05-23 17:09 ` Mikulas Patocka
2020-05-23 19:27 ` Maciej W. Rozycki
2020-05-23 20:11 ` Mikulas Patocka
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