From: Matthew Wilcox <willy6545@gmail.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>,
"ksummit-discuss@lists.linuxfoundation.org"
<ksummit-discuss@lists.linuxfoundation.org>
Subject: Re: [Ksummit-discuss] [CORE TOPIC] More useful types in the linux kernel
Date: Fri, 12 Aug 2016 02:23:57 -0400 [thread overview]
Message-ID: <CAFhKne_VKTODCD42V0RB2BYPTRa_j88HruTqyHXOkmQXbFcrHw@mail.gmail.com> (raw)
In-Reply-To: <20160812090706-mutt-send-email-mst@kernel.org>
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On Fri, Aug 12, 2016 at 2:09 AM, Michael S. Tsirkin <mst@redhat.com> wrote:
> I guess
> typedef void * errno_t;
> is one way, maybe marking it noderef for good measure.
>
> This means the values are 64 bit unfortunately, which is often
> overkill.
>
s/64-bit/native word size/
Does anyone know of an ABI where that's *inefficient*?! Or at least, less
efficient than returning a 32-bit int? Pretty much every ABI I ever saw
says something along the lines of 'register FOO contains the return value
if the type is small enough, otherwise for returning aggregates, register
FOO contains ...'
I can't believe anyone would deliberately design an ABI where calling
void *foo(void) is less efficient than calling int bar(void);
(and if you have some weird DSP or the CDC6600 in mind where Linux won't
run anyway, then comp.arch.necrophilia is --> that way)
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next prev parent reply other threads:[~2016-08-12 6:24 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-19 15:32 Eric W. Biederman
2016-07-19 17:31 ` Mark Brown
2016-07-19 18:52 ` Jiri Kosina
2016-07-19 20:39 ` Eric W. Biederman
2016-07-20 15:53 ` Mark Brown
2016-07-20 17:04 ` [Ksummit-discuss] [CORE TOPIC] [TECH TOPIC] Support (or move towards to) LLVM Jiri Kosina
2016-07-20 18:35 ` Alexey Dobriyan
2016-07-20 18:52 ` Mark Brown
2016-07-21 9:54 ` David Woodhouse
2016-07-21 13:41 ` Shuah Khan
2016-07-21 14:02 ` David Woodhouse
2016-07-21 16:21 ` Mark Brown
2016-07-23 3:28 ` Behan Webster
2016-07-21 18:38 ` Jiri Kosina
2016-07-21 20:47 ` Paul Turner
2016-07-26 11:22 ` David Woodhouse
2016-07-19 21:08 ` [Ksummit-discuss] [CORE TOPIC] More useful types in the linux kernel James Bottomley
2016-07-20 0:08 ` Eric W. Biederman
2016-07-20 7:32 ` Julia Lawall
2016-07-20 12:11 ` Jan Kara
2016-07-28 3:33 ` Steven Rostedt
2016-07-19 21:26 ` Josh Triplett
2016-07-20 2:36 ` Eric W. Biederman
2016-07-30 18:03 ` Eric W. Biederman
2016-07-30 18:49 ` Josh Triplett
2016-07-30 19:34 ` Eric W. Biederman
2016-07-30 20:56 ` Josh Triplett
2016-07-30 22:21 ` Eric W. Biederman
2016-07-21 15:05 ` David Howells
2016-07-21 23:33 ` Dmitry Torokhov
2016-07-22 6:00 ` Hannes Reinecke
2016-07-22 6:14 ` Julia Lawall
2016-07-22 13:57 ` Hannes Reinecke
2016-07-22 14:40 ` Julia Lawall
2016-07-22 19:12 ` Arnd Bergmann
2016-07-26 11:48 ` David Woodhouse
2016-07-26 12:53 ` Hannes Reinecke
2016-07-26 13:59 ` Alexey Dobriyan
2016-07-26 13:53 ` Alexey Dobriyan
2016-07-27 12:40 ` Julia Lawall
2016-07-27 13:25 ` James Bottomley
2016-07-27 13:33 ` David Woodhouse
2016-07-27 17:21 ` Bird, Timothy
2016-08-01 22:17 ` Rob Herring
2016-08-12 1:29 ` Stephen Boyd
2016-08-11 15:44 ` Dan Carpenter
2016-08-12 0:38 ` NeilBrown
2016-08-12 20:56 ` Dan Carpenter
2016-08-12 3:51 ` Matthew Wilcox
2016-08-12 4:01 ` Josh Triplett
2016-08-12 4:07 ` Matthew Wilcox
2016-08-12 5:29 ` Alexey Dobriyan
2016-08-12 5:38 ` Michael S. Tsirkin
2016-08-12 6:04 ` Julia Lawall
2016-08-12 6:09 ` Michael S. Tsirkin
2016-08-12 6:23 ` Matthew Wilcox [this message]
2016-08-12 6:37 ` Julia Lawall
2016-08-12 5:50 ` Matthew Wilcox
2016-08-04 7:15 ` NeilBrown
2016-08-04 11:19 ` Julia Lawall
2016-07-22 7:03 ` David Howells
2016-07-22 10:10 ` Alexey Dobriyan
2016-07-22 10:13 ` David Howells
2016-07-22 10:22 ` Alexey Dobriyan
2016-07-22 10:53 ` Vlastimil Babka
2016-07-22 11:05 ` David Howells
2016-07-22 17:18 ` Julia Lawall
2016-07-22 18:19 ` Dmitry Torokhov
2016-07-22 19:43 ` Guenter Roeck
2016-07-28 3:40 ` Steven Rostedt
2016-07-28 7:12 ` David Howells
2016-08-02 10:48 ` Jani Nikula
2016-08-04 11:31 ` David Woodhouse
2016-08-04 12:07 ` Jani Nikula
2016-07-22 11:19 ` David Howells
2016-07-22 12:44 ` Linus Walleij
2016-07-22 13:26 ` David Howells
2016-08-12 4:42 ` Michael S. Tsirkin
[not found] ` <871t1ulfvz.fsf@notabene.neil.brown.name>
2016-08-12 5:34 ` Michael S. Tsirkin
2016-08-12 6:23 ` NeilBrown
[not found] ` <87y442jytb.fsf@notabene.neil.brown.name>
2016-08-15 23:26 ` Michael S. Tsirkin
2016-08-12 6:23 ` NeilBrown
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