From: Anatolij Gustschin <agust-ynQEQJNshbs@public.gmane.org>
To: Joshua Clayton <stillcompiling-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Alan Tull
<atull-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>,
Moritz Fischer
<moritz.fischer-+aYTwkv1SeIAvxtiuMwx3w@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Russell King <linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH v4 1/3] lib: add bitrev8x4()
Date: Fri, 2 Dec 2016 08:51:57 +0100 [thread overview]
Message-ID: <20161202085157.1a6ec811@crub> (raw)
In-Reply-To: <8fb2f1c2-c39c-b74f-d5c8-d6731cbd67c8-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Hi Joshua,
On Thu, 1 Dec 2016 16:04:09 -0800
Joshua Clayton stillcompiling-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
...
>>> +static __always_inline __attribute_const__ u32 __arch_bitrev8x4(u32 x)
>>> +{
>>> + __asm__ ("rbit %0, %1; rev %0, %0" : "=r" (x) : "r" (x));
>> return x;
>Oops thats a little embarrassing;
>I'll add a return.
>>> +}
>> otherwise you get
>>
>> In function '__arch_bitrev8x4':
>> warning: no return statement in function returning non-void [-Wreturn-type]
>>
>
>I wonder why I do not see this warning when compiling. The inlining, maybe?
do you have CONFIG_HAVE_ARCH_BITREVERSE=y in your .config?
Probably not optimized code is used, otherwise you will send wrong
data to FPGA (due to wrong return values from __arch_bitrev8x4).
Anatolij
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2016-12-02 7:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-01 17:04 [PATCH v4 0/3] Altera Cyclone Passive Serial SPI FPGA Manager Joshua Clayton
2016-12-01 17:04 ` [PATCH v4 1/3] lib: add bitrev8x4() Joshua Clayton
2016-12-01 22:45 ` Anatolij Gustschin
2016-12-02 0:04 ` Joshua Clayton
[not found] ` <8fb2f1c2-c39c-b74f-d5c8-d6731cbd67c8-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-12-02 7:51 ` Anatolij Gustschin [this message]
2016-12-01 17:04 ` [PATCH v4 2/3] doc: dt: add cyclone-spi binding document Joshua Clayton
[not found] ` <137f03de76e5f865430b17ca247e8f73e3315c8d.1480551148.git.stillcompiling-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-12-01 17:41 ` Moritz Fischer
2016-12-06 16:05 ` Rob Herring
2016-12-01 17:04 ` [PATCH v4 3/3] fpga manager: Add cyclone-ps-spi driver for Altera FPGAs Joshua Clayton
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=20161202085157.1a6ec811@crub \
--to=agust-ynqeqjnshbs@public.gmane.org \
--cc=atull-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org \
--cc=devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org \
--cc=linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=mark.rutland-5wv7dgnIgG8@public.gmane.org \
--cc=moritz.fischer-+aYTwkv1SeIAvxtiuMwx3w@public.gmane.org \
--cc=robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
--cc=stillcompiling-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
/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).