From: Mark Rutland <mark.rutland@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"linux-snps-arc@lists.infradead.org"
<linux-snps-arc@lists.infradead.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
"greg@kroah.com" <greg@kroah.com>,
"will.deacon@arm.com" <will.deacon@arm.com>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"David.Laight@ACULAB.COM" <David.Laight@ACULAB.COM>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"geert@linux-m68k.org" <geert@linux-m68k.org>
Subject: Re: [PATCH v3] devres: Explicitly align datai[] to 64-bit
Date: Mon, 9 Jul 2018 16:48:45 +0100 [thread overview]
Message-ID: <20180709154844.5p5yk34ezw2gbt3y@lakrids.cambridge.arm.com> (raw)
In-Reply-To: <20180709154521.GS2512@hirez.programming.kicks-ass.net>
On Mon, Jul 09, 2018 at 05:45:21PM +0200, Peter Zijlstra wrote:
> On Mon, Jul 09, 2018 at 05:34:27PM +0200, Peter Zijlstra wrote:
> > On Mon, Jul 09, 2018 at 04:29:58PM +0100, Mark Rutland wrote:
> > > Shouldn't that be 8? AFAICT, __alignof__(unsigned long long) is 8 on
> > > x86_32:
> >
> > Curious, I wonder why we put that align in atomic64_32 then.
>
> Shiny, look at this: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54188
>
Ouch.
[mark@lakrids:~]% cat test.c
#include <stdio.h>
#define PRINT_TYPE_INFO(t) \
printf("%10s %5d %5d\n", #t, sizeof(t), __alignof__(t))
struct ull {
unsigned long long v;
};
int main(int argc, char *argv[])
{
printf("%10s %5s %5s\n", "TYPE", "SIZE", "ALIGN");
PRINT_TYPE_INFO(int);
PRINT_TYPE_INFO(long);
PRINT_TYPE_INFO(long long);
PRINT_TYPE_INFO(struct ull);
return 0;
}
[mark@lakrids:~]% gcc -m32 test.c -o test
[mark@lakrids:~]% ./test
TYPE SIZE ALIGN
int 4 4
long 4 4
long long 8 8
struct ull 8 4
Mark.
next prev parent reply other threads:[~2018-07-09 15:48 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-09 13:45 [PATCH v3] devres: Explicitly align datai[] to 64-bit Alexey Brodkin
2018-07-09 13:45 ` Alexey Brodkin
2018-07-09 13:54 ` Peter Zijlstra
2018-07-09 13:54 ` Peter Zijlstra
2018-07-09 14:04 ` Mark Rutland
2018-07-09 14:04 ` Mark Rutland
2018-07-09 14:10 ` Geert Uytterhoeven
2018-07-09 14:10 ` Geert Uytterhoeven
2018-07-09 14:07 ` Alexey Brodkin
2018-07-09 14:07 ` Alexey Brodkin
2018-07-09 14:07 ` Peter Zijlstra
2018-07-09 14:07 ` Peter Zijlstra
2018-07-09 14:10 ` Peter Zijlstra
2018-07-09 14:10 ` Peter Zijlstra
2018-07-09 14:33 ` Alexey Brodkin
2018-07-09 14:33 ` Alexey Brodkin
2018-07-09 14:49 ` Peter Zijlstra
2018-07-09 14:49 ` Peter Zijlstra
2018-07-09 14:53 ` Alexey Brodkin
2018-07-09 14:53 ` Alexey Brodkin
2018-10-04 16:19 ` Alexey Brodkin
2018-10-04 16:19 ` Alexey Brodkin
2018-07-09 15:02 ` David Laight
2018-07-09 15:02 ` David Laight
2018-07-09 15:14 ` Peter Zijlstra
2018-07-09 15:14 ` Peter Zijlstra
2018-07-09 15:29 ` Mark Rutland
2018-07-09 15:29 ` Mark Rutland
2018-07-09 15:34 ` Peter Zijlstra
2018-07-09 15:34 ` Peter Zijlstra
2018-07-09 15:45 ` Peter Zijlstra
2018-07-09 15:45 ` Peter Zijlstra
2018-07-09 15:48 ` Mark Rutland [this message]
2018-07-09 15:48 ` Mark Rutland
2018-07-09 16:10 ` David Laight
2018-07-09 16:10 ` David Laight
2018-07-09 20:28 ` Vineet Gupta
2018-07-09 20:28 ` Vineet Gupta
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=20180709154844.5p5yk34ezw2gbt3y@lakrids.cambridge.arm.com \
--to=mark.rutland@arm.com \
--cc=Alexey.Brodkin@synopsys.com \
--cc=David.Laight@ACULAB.COM \
--cc=geert@linux-m68k.org \
--cc=greg@kroah.com \
--cc=gregkh@linuxfoundation.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-snps-arc@lists.infradead.org \
--cc=peterz@infradead.org \
--cc=stable@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=will.deacon@arm.com \
/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).