LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Peter Zijlstra <peterz@infradead.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	linaro-kernel@lists.linaro.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] hrtimer: create for_each_active_base() to iterate over active clock-bases
Date: Thu, 2 Apr 2015 15:45:19 +0200	[thread overview]
Message-ID: <20150402134519.GA23123@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <909ec44dbfcc4898ecaf86f72e311f78756b21a8.1427959032.git.viresh.kumar@linaro.org>

On Thu, Apr 02, 2015 at 04:21:22PM +0530, Viresh Kumar wrote:
> +#define for_each_active_base(_index, _base, _cpu_base, _active_bases)	\
> +	for ((_active_bases) = (_cpu_base)->active_bases;		\
> +		(_index) = ffs(_active_bases),				\
> +		(_base) = (_cpu_base)->clock_base + (_index) - 1, (_index); \
> +		(_active_bases) &= ~(1 << ((_index) - 1)))

Can't use ffs here, some people end up using asm-generic/bitops/ffs.h
and that sucks.

Esp for small vectors like here, the unconditional iteration is faster.

  reply	other threads:[~2015-04-02 13:45 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-02 10:51 [PATCH 0/2] hrtimer: Only iterate over active bases Viresh Kumar
2015-04-02 10:51 ` [PATCH 1/2] hrtimer: update '->active_bases' before calling hrtimer_force_reprogram() Viresh Kumar
2015-04-02 13:47   ` Peter Zijlstra
2015-04-02 13:53     ` Viresh Kumar
2015-04-02 14:16       ` Peter Zijlstra
2015-04-02 14:23         ` Viresh Kumar
2015-04-02 10:51 ` [PATCH 2/2] hrtimer: create for_each_active_base() to iterate over active clock-bases Viresh Kumar
2015-04-02 13:45   ` Peter Zijlstra [this message]
2015-04-03  5:42     ` viresh kumar

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=20150402134519.GA23123@twins.programming.kicks-ass.net \
    --to=peterz@infradead.org \
    --cc=linaro-kernel@lists.linaro.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=tglx@linutronix.de \
    --cc=viresh.kumar@linaro.org \
    --subject='Re: [PATCH 2/2] hrtimer: create for_each_active_base() to iterate over active clock-bases' \
    /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

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).