From: Arnd Bergmann <arnd@arndb.de>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
"Heiko Stübner" <heiko@sntech.de>,
"Padmavathi Venna" <padma.v@samsung.com>,
"Takashi Iwai" <tiwai@suse.de>,
"Alessandro Rubini" <rubini@gnudd.com>,
"Tomasz Figa" <tomasz.figa@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Giancarlo Asnaghi" <giancarlo.asnaghi@st.com>,
linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
"Russell King - ARM Linux" <linux@arm.linux.org.uk>,
"Vinod Koul" <vinod.koul@intel.com>,
"Thomas Abraham" <thomas.abraham@linaro.org>,
"Grant Likely" <grant.likely@linaro.org>,
"Kukjin Kim" <kgene.kim@samsung.com>,
"Sylwester Nawrocki" <sylvester.nawrocki@gmail.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"Sangbeom Kim" <sbkim73@samsung.com>,
"Liam Girdwood" <lgirdwood@gmail.com>,
linux-spi@vger.kernel.org, "Mark Brown" <broonie@kerne>
Subject: Re: [RFC PATCH 01/11] dma: amba-pl08x: Use bitmap to pass variant specific quirks
Date: Tue, 18 Jun 2013 15:33:46 +0200 [thread overview]
Message-ID: <201306181533.46905.arnd@arndb.de> (raw)
In-Reply-To: <CACRpkdbt4fAdnDKuP8bVpwrWoJ-oGNuSbiDZDz5J12ix2qijfQ@mail.gmail.com>
On Tuesday 18 June 2013, Linus Walleij wrote:
> I thought about it yesterday and it basically looks to me that
> it tries to outsmart the compiler on how to stuff the flags to save
> struct space on the heap and hint that they can be determined
> quickly by a & operation, this is like premature optimization.
>
> So please go back to the old system.
Note that a 'bool' is typically stored as a 32-bit field, so there
would be some space saving if there are a lot of flags.
I agree with the conclusion though, the previous state was more
readable, which outweighs any benefits.
Arnd
next prev parent reply other threads:[~2013-06-18 13:33 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-16 20:54 [RFC PATCH 00/11] ARM: s3c64xx: Let amba-pl08x driver handle DMA Tomasz Figa
2013-06-16 20:54 ` [RFC PATCH 01/11] dma: amba-pl08x: Use bitmap to pass variant specific quirks Tomasz Figa
2013-06-17 13:25 ` Linus Walleij
2013-06-17 18:48 ` Russell King - ARM Linux
2013-06-17 18:56 ` Tomasz Figa
2013-06-18 7:47 ` Linus Walleij
2013-06-18 13:33 ` Arnd Bergmann [this message]
2013-06-16 20:54 ` [RFC PATCH 02/11] dma: amba-pl08x: Refactor pl08x_getbytes_chan() to lower indentation Tomasz Figa
2013-06-17 13:29 ` Linus Walleij
2013-06-16 20:54 ` [RFC PATCH 03/11] dma: amba-pl08x: Add support for different offset of CONFIG register Tomasz Figa
2013-06-17 13:31 ` Linus Walleij
2013-06-17 18:52 ` Russell King - ARM Linux
2013-06-17 19:02 ` Tomasz Figa
2013-06-16 20:54 ` [RFC PATCH 04/11] dma: amba-pl08x: Add support for PL080S variant Tomasz Figa
2013-06-17 13:39 ` Linus Walleij
2013-06-17 18:22 ` Tomasz Figa
2013-06-16 20:54 ` [RFC PATCH 05/11] dma: amba-pl08x: Add support for different maximum transfer size Tomasz Figa
2013-06-17 13:42 ` Linus Walleij
2013-06-17 18:27 ` Tomasz Figa
2013-06-16 20:54 ` [RFC PATCH 06/11] dma: amba-pl08x: Keep LLIs aligned to 4-word boundary Tomasz Figa
2013-06-17 13:51 ` Linus Walleij
2013-06-17 18:28 ` Tomasz Figa
2013-06-17 19:01 ` Russell King - ARM Linux
2013-06-16 20:54 ` [RFC PATCH 07/11] dmaengine: PL08x: Fix reading the byte count in cctl Tomasz Figa
2013-06-17 13:53 ` Linus Walleij
2013-06-17 18:32 ` Tomasz Figa
2013-06-17 19:03 ` Russell King - ARM Linux
2013-06-16 20:54 ` [RFC PATCH 08/11] dmaengine: PL08x: Add cyclic transfer support Tomasz Figa
2013-06-17 13:57 ` Linus Walleij
2013-06-17 18:52 ` Tomasz Figa
2013-06-17 18:56 ` Russell King - ARM Linux
2013-06-16 20:54 ` [RFC PATCH 09/11] spi: s3c64xx: Do not require legacy DMA API in case of S3C64XX Tomasz Figa
2013-06-17 13:59 ` Linus Walleij
2013-06-17 16:06 ` Mark Brown
2013-06-17 19:36 ` Tomasz Figa
2013-06-16 20:54 ` [RFC PATCH 10/11] ASoC: samsung: " Tomasz Figa
2013-06-17 14:01 ` Linus Walleij
2013-06-16 20:54 ` [RFC PATCH 11/11] ARM: s3c64xx: Add support for DMA using generic amba-pl08x driver Tomasz Figa
2013-06-17 14:04 ` Linus Walleij
2013-06-19 18:23 ` Tomasz Figa
2013-06-19 19:50 ` Linus Walleij
2013-06-17 14:06 ` [RFC PATCH 00/11] ARM: s3c64xx: Let amba-pl08x driver handle DMA Linus Walleij
2013-06-17 19:38 ` Tomasz Figa
2013-06-19 17:40 ` Mark Brown
2013-06-19 18:26 ` Tomasz Figa
2013-06-19 19:01 ` Arnd Bergmann
2013-06-19 19:24 ` Mark Brown
2013-06-19 19:22 ` Mark Brown
2013-06-19 19:32 ` Tomasz Figa
2013-06-19 22:48 ` Mark Brown
2013-06-20 9:24 ` Phil Carmody
2013-06-20 10:35 ` Mark Brown
2013-06-20 11:14 ` Phil Carmody
2013-06-21 9:47 ` Mark Brown
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