From: yuankuiz@codeaurora.org
To: Joe Perches <joe@perches.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Linux PM <linux-pm@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Frederic Weisbecker <fweisbec@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>, Len Brown <len.brown@intel.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-pm-owner@vger.kernel.org, akpm@linux-foundation.org
Subject: Re: [PATCH] time: tick-sched: use bool for tick_stopped
Date: Wed, 25 Apr 2018 15:01:46 +0800 [thread overview]
Message-ID: <2c7c90722795ecfbe4e3e907f725549c@codeaurora.org> (raw)
In-Reply-To: <9447358d3f7cda9032b24d62dd79dacfca73fc30.camel@perches.com>
On 2018-04-21 03:24 AM, Joe Perches wrote:
> On Fri, 2018-04-20 at 14:44 +0800, yuankuiz@codeaurora.org wrote:
>> On 2018-04-20 09:47 AM, yuankuiz@codeaurora.org wrote:
> []
>> > [ZJ] Further prototyping has been given based on gcc for both of
>> > x86_64 and armv8-a,
>> > unsigned int and bool share the same 1 bytes without the
>> > addtional storage for sure.
>> > Open this and welcome if any other difference behaviour could be
>> > captured.
>>
>> [ZJ] Typo.. change 4 bytes above to 1 byte actually.
>
> Not really.
>
> unsigned int is 4 and bool is generally 1.
> Alignment padding after a bool may exist.
[ZJ] Depending on how to pack, the size was padded is variance. For
example.
In case of the "unsigned char" at the following, pack is happened
and result 1 bytes.(if no more than 8 bits are used)
In case of the "int" at the following, pack is happened but result
4 bytes.
I mean, I demo it but use the 1# case due for another thread
discussion on the ichx_desc() so move a little bit from the tick_sched
struct.
next prev parent reply other threads:[~2018-04-25 7:01 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-10 7:33 Subject: [PATCH] [PATCH] time: tick-sched: use bool for tick_stopped yuankuiz
2018-04-10 7:45 ` yuankuiz
2018-04-10 8:51 ` yuankuiz
2018-04-10 8:54 ` yuankuiz
2018-04-10 7:55 ` Subject: [PATCH] " Thomas Gleixner
2018-04-10 8:12 ` yuankuiz
2018-04-10 8:00 ` Rafael J. Wysocki
2018-04-10 8:15 ` yuankuiz
2018-04-10 9:10 ` Thomas Gleixner
2018-04-10 10:07 ` yuankuiz
2018-04-10 11:06 ` Thomas Gleixner
2018-04-10 14:08 ` yuankuiz
2018-04-10 14:49 ` yuankuiz
2018-04-10 23:09 ` yuankuiz
2018-04-10 23:20 ` yuankuiz
2018-04-20 1:47 ` yuankuiz
2018-04-20 6:44 ` yuankuiz
2018-04-20 19:24 ` Joe Perches
2018-04-25 7:01 ` yuankuiz [this message]
2018-04-10 11:26 ` Peter Zijlstra
2018-04-10 12:07 ` Thomas Gleixner
2018-04-10 12:26 ` Peter Zijlstra
2018-04-10 12:33 ` Subject: [PATCH] " Peter Zijlstra
2018-04-10 15:14 ` Joe Perches
2018-04-10 16:30 ` Peter Zijlstra
2018-04-10 15:41 ` [PATCH] checkpatch: whinge about bool bitfields Joe Perches
2018-04-10 18:19 ` [PATCH] checkpatch: Add a --strict test for structs with bool member definitions Joe Perches
2018-04-10 21:39 ` Andrew Morton
2018-04-10 21:53 ` Joe Perches
2018-04-10 22:00 ` Andrew Morton
2018-04-11 8:15 ` Peter Zijlstra
2018-04-11 16:29 ` Andrew Morton
2018-04-11 16:51 ` Joe Perches
2018-04-12 6:22 ` Julia Lawall
2018-04-12 6:42 ` Joe Perches
2018-04-12 7:03 ` Julia Lawall
2018-04-12 8:13 ` Peter Zijlstra
2018-04-14 21:19 ` Julia Lawall
2018-04-17 9:07 ` yuankuiz
2018-04-18 18:38 ` Joe Perches
2018-04-19 4:40 ` Julia Lawall
2018-04-19 4:51 ` Joe Perches
2018-04-19 5:16 ` Julia Lawall
2018-04-19 6:48 ` yuankuiz
2018-04-19 10:42 ` yuankuiz
2018-04-20 1:31 ` yuankuiz
2018-04-11 17:00 ` Peter Zijlstra
2018-04-12 7:47 ` Ingo Molnar
2018-04-12 8:11 ` Peter Zijlstra
2018-04-12 9:35 ` Andrea Parri
2018-04-12 11:50 ` Peter Zijlstra
2018-04-12 12:01 ` Joe Perches
2018-04-12 12:08 ` Peter Zijlstra
2018-04-12 12:38 ` Joe Perches
2018-04-12 16:47 ` Andrew Morton
2018-04-12 11:52 ` Kalle Valo
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