From: Nicolas Pitre <nicolas.pitre@linaro.org>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: kgene.kim@samsung.com, linus.walleij@stericsson.com,
devicetree-discuss@lists.ozlabs.org, rmallon@gmail.com,
rob.herring@calxeda.com, hsweeten@visionengravers.com,
rajeev-dlh.kumar@st.com, ben-linux@fluff.org,
STEricsson_nomadik_linux@list.st.com,
Linus Walleij <linus.walleij@linaro.org>,
linux-arm-kernel@lists.infradead.org, rubini@unipv.it
Subject: Re: [PATCHv2 02/10] ARM: vic: MULTI_IRQ_HANDLER handler
Date: Thu, 3 Nov 2011 09:49:55 -0400 (EDT) [thread overview]
Message-ID: <alpine.LFD.2.02.1111030935060.3307@xanadu.home> (raw)
In-Reply-To: <20111103125136.GL12913@n2100.arm.linux.org.uk>
On Thu, 3 Nov 2011, Russell King - ARM Linux wrote:
> stat = readl_relaxed(vic->base + VIC_IRQ_STATUS);
> while (stat) {
> while (stat) {
> irq = ffs(stat) - 1;
> stat &= ~(1 << irq);
> handle_irq(irq);
> }
> stat = readl_relaxed(vic->base + VIC_IRQ_STATUS);
> }
The inner loop could be a do { } while() construct to avoid evaluating
stat twice on each outer loop itteration. Maybe gcc is smart enough to
notice though, maybe not.
Nicolas
WARNING: multiple messages have this Message-ID (diff)
From: nicolas.pitre@linaro.org (Nicolas Pitre)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCHv2 02/10] ARM: vic: MULTI_IRQ_HANDLER handler
Date: Thu, 3 Nov 2011 09:49:55 -0400 (EDT) [thread overview]
Message-ID: <alpine.LFD.2.02.1111030935060.3307@xanadu.home> (raw)
In-Reply-To: <20111103125136.GL12913@n2100.arm.linux.org.uk>
On Thu, 3 Nov 2011, Russell King - ARM Linux wrote:
> stat = readl_relaxed(vic->base + VIC_IRQ_STATUS);
> while (stat) {
> while (stat) {
> irq = ffs(stat) - 1;
> stat &= ~(1 << irq);
> handle_irq(irq);
> }
> stat = readl_relaxed(vic->base + VIC_IRQ_STATUS);
> }
The inner loop could be a do { } while() construct to avoid evaluating
stat twice on each outer loop itteration. Maybe gcc is smart enough to
notice though, maybe not.
Nicolas
next prev parent reply other threads:[~2011-11-03 13:49 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-28 10:41 [PATCHv2 00/10] VIC DT binding and MULTI_IRQ_HANDLER Jamie Iles
2011-09-28 10:41 ` Jamie Iles
2011-09-28 10:41 ` [PATCHv2 01/10] ARM: vic: device tree binding Jamie Iles
2011-09-28 10:41 ` Jamie Iles
[not found] ` <1317206507-18867-2-git-send-email-jamie-wmLquQDDieKakBO8gow8eQ@public.gmane.org>
2011-09-28 20:11 ` Grant Likely
2011-09-28 20:11 ` Grant Likely
2011-09-29 4:00 ` Rob Herring
2011-09-29 4:00 ` Rob Herring
[not found] ` <1317206507-18867-1-git-send-email-jamie-wmLquQDDieKakBO8gow8eQ@public.gmane.org>
2011-09-28 10:41 ` [PATCHv2 02/10] ARM: vic: MULTI_IRQ_HANDLER handler Jamie Iles
2011-09-28 10:41 ` Jamie Iles
2011-09-28 11:09 ` Linus Walleij
2011-09-28 11:09 ` Linus Walleij
2011-09-28 12:08 ` Jamie Iles
2011-09-28 12:08 ` Jamie Iles
2011-09-28 20:39 ` Grant Likely
2011-09-28 20:39 ` Grant Likely
2011-09-29 6:55 ` Linus Walleij
2011-09-29 6:55 ` Linus Walleij
[not found] ` <CACRpkdZKns-GraGp-YMD6jzOPETkvEpt9bC8HcYUmf3JUyCV3A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-09-29 9:30 ` Jamie Iles
2011-09-29 9:30 ` Jamie Iles
[not found] ` <20110929093009.GM17204-apL1N+EY0C9YtYNIL7UdTEEOCMrvLtNR@public.gmane.org>
2011-09-29 16:55 ` Grant Likely
2011-09-29 16:55 ` Grant Likely
2011-11-02 13:40 ` Russell King - ARM Linux
2011-11-02 13:40 ` Russell King - ARM Linux
2011-11-02 14:08 ` Jamie Iles
2011-11-02 14:08 ` Jamie Iles
2011-11-03 12:29 ` Linus Walleij
2011-11-03 12:29 ` Linus Walleij
[not found] ` <CACRpkdY+EBkHfupO5T4SYKPxzX2L2kr8fLVMJK=JctNeYAzn2g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-11-03 12:51 ` Russell King - ARM Linux
2011-11-03 12:51 ` Russell King - ARM Linux
2011-11-03 13:00 ` Linus Walleij
2011-11-03 13:00 ` Linus Walleij
2011-11-03 13:04 ` Jamie Iles
2011-11-03 13:04 ` Jamie Iles
[not found] ` <CACRpkdZ1qfVduMAmusNoLjDoqy2kDA4crN__iW9qEeXBgVT4cA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-11-03 13:31 ` Russell King - ARM Linux
2011-11-03 13:31 ` Russell King - ARM Linux
2011-11-03 15:03 ` Jamie Iles
2011-11-03 15:03 ` Jamie Iles
2011-11-03 15:11 ` Russell King - ARM Linux
2011-11-03 15:11 ` Russell King - ARM Linux
2011-11-03 13:49 ` Nicolas Pitre [this message]
2011-11-03 13:49 ` Nicolas Pitre
2011-09-29 15:03 ` Zoltan Devai
2011-09-29 15:03 ` Zoltan Devai
2011-09-29 15:13 ` Jamie Iles
2011-09-29 15:13 ` Jamie Iles
2011-09-28 10:41 ` [PATCHv2 03/10] ARM: ep93xx: convert to MULTI_IRQ_HANDLER Jamie Iles
2011-09-28 10:41 ` Jamie Iles
2011-09-28 11:15 ` Linus Walleij
2011-09-28 11:15 ` Linus Walleij
2011-09-28 10:41 ` [PATCHv2 05/10] ARM: nomadik: " Jamie Iles
2011-09-28 10:41 ` Jamie Iles
2011-09-28 11:12 ` Linus Walleij
2011-09-28 11:12 ` Linus Walleij
2011-09-28 10:41 ` [PATCHv2 06/10] ARM: s3c64xx: " Jamie Iles
2011-09-28 10:41 ` Jamie Iles
2011-09-28 10:41 ` [PATCHv2 07/10] ARM: spear: " Jamie Iles
2011-09-28 10:41 ` Jamie Iles
2011-09-28 10:41 ` [PATCHv2 08/10] ARM: u300: " Jamie Iles
2011-09-28 10:41 ` Jamie Iles
2011-09-28 11:03 ` Linus Walleij
2011-09-28 11:03 ` Linus Walleij
2011-09-28 12:03 ` Jamie Iles
2011-09-28 12:03 ` Jamie Iles
[not found] ` <20110928120340.GH17204-apL1N+EY0C9YtYNIL7UdTEEOCMrvLtNR@public.gmane.org>
2011-09-28 12:18 ` Linus Walleij
2011-09-28 12:18 ` Linus Walleij
2011-09-28 12:29 ` Jamie Iles
2011-09-28 12:29 ` Jamie Iles
2011-09-28 10:41 ` [PATCHv2 09/10] ARM: versatile: " Jamie Iles
2011-09-28 10:41 ` Jamie Iles
2011-09-28 10:41 ` [PATCHv2 10/10] ARM: samsung: " Jamie Iles
2011-09-28 10:41 ` Jamie Iles
2011-09-28 10:41 ` [PATCHv2 04/10] ARM: netx: " Jamie Iles
2011-09-28 10:41 ` Jamie Iles
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