Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751498Ab3HSWhW (ORCPT ); Mon, 19 Aug 2013 18:37:22 -0400 Received: from mail-pb0-f48.google.com ([209.85.160.48]:54455 "EHLO mail-pb0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751215Ab3HSWhU convert rfc822-to-8bit (ORCPT ); Mon, 19 Aug 2013 18:37:20 -0400 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT To: Nicolas Ferre , boris brezillon , "Jean-Christophe PLAGNIOL-VILLARD" From: Mike Turquette In-Reply-To: <52124692.4080905@atmel.com> Cc: Russell King , Linus Walleij , Ludovic Desroches , Richard Genoud , Mark Brown , , , References: <1375870466-1093-1-git-send-email-b.brezillon@overkiz.com> <20130808140722.GA18627@ns203013.ovh.net> <5203B7DA.8030706@overkiz.com> <52124692.4080905@atmel.com> Message-ID: <20130819223714.4443.95698@quantum> User-Agent: alot/0.3.4 Subject: Re: [PATCH] ARM: at91/dt: split sam9x5 peripheral definitions Date: Mon, 19 Aug 2013 15:37:14 -0700 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 24757 Lines: 471 Quoting Nicolas Ferre (2013-08-19 09:23:46) > On 08/08/2013 17:23, boris brezillon : > > Hello Jean-Christophe, > > > > On 08/08/2013 16:07, Jean-Christophe PLAGNIOL-VILLARD wrote: > >> On 12:14 Wed 07 Aug , Boris BREZILLON wrote: > >>> This patch splits the sam9x5 peripheral definitions into: > >>> - a common base for all sam9x5 SoCs (at91sam9x5.dtsi) > >>> - several optional peripheral definitions which will be included by specific > >>> sam9x5 SoCs (at91sam9x5_'periph name'.dtsi) > >>> > >>> This provides a better representation of the real hardware (drop unneeded > >>> dt nodes) and avoids future peripheral id conflict (lcdc and isi both use > >>> peripheral id 25). > >> I really don't like this > >> > >> the mapping is soc specific (here familly) so I does not see any advantage > >> except move files so NO for me > > Let me explain in detail why I did that. > > > > This separation was part of the "at91 common clk" series and was here to > > avoid the > > definition of unavailable clocks or definition of clocks with the same > > id (which may result > > in bad clk registration). > > If we keep all the definitions in one .dtsi file (even the one which are > > not really available), > > I may need to add a new property to each peripheral (and system) clk > > node to specify the > > availabilty of the clock (something similar to 'status="disabled"' in > > device nodes). > > This is indeed a pretty good argument. > I do think that we have to ask Mike Turquette to see if he already has > encountered such a case. It is correct to place chip-specific clocks into a chip-specific dts. Having clocks marked as "disabled" in a big dtsi is not the right way to go. Regarding naming conflicts, is your issue with string name collisions during calls to __clk_lookup? Thanks, Mike > > I must say that I was not in favor for this split because of readability > and dts/dtsi file organization (you know, the usual question: where the > hell this peripheral property is finally setup?). > > But, if we really have to implement a new kind of property to tell if a > clock is actually present or not, I am in favor for reconsidering this > solution as it seems quite simple and self-explanatory... > > > As explained to Thomas, I thought device tree was here to give a real > > description of the > > hardware parts (in case of sam9x5.dtsi the description of the common > > parts of sam9x5 SoC > > family). > > If you define peripherals that are not present in a SoC (lets say macb0 > > for sam9g15) you break > > this rule. > > Well, on the other hand, the status says "disabled", so we can imagine > that it has been disabled, from its birth, in hardware... > > > I'm not telling I have the right approach here, I'm just trying to > > understand what should be done and > > what should not. > > > > Finally, I'd like to point that the memory footprint of the dtb file > > generated after this patch has been > > applied is bit smaller (even if it won't make a real difference): > > > > with this patch: > > > > 15937 arch/arm/boot/dts/at91-ariag25.dtb > > 15860 arch/arm/boot/dts/at91sam9g15ek.dtb > > 16905 arch/arm/boot/dts/at91sam9g25ek.dtb > > 16473 arch/arm/boot/dts/at91sam9g35ek.dtb > > 17341 arch/arm/boot/dts/at91sam9x25ek.dtb > > 16473 arch/arm/boot/dts/at91sam9x35ek.dtb > > > > without this patch: > > > > 16077 arch/arm/boot/dts/at91-ariag25.dtb > > 16824 arch/arm/boot/dts/at91sam9g15ek.dtb > > 16849 arch/arm/boot/dts/at91sam9g25ek.dtb > > 16849 arch/arm/boot/dts/at91sam9g35ek.dtb > > 15017 arch/arm/boot/dts/at91sam9m10g45ek.dtb > > 17145 arch/arm/boot/dts/at91sam9x25ek.dtb > > 16849 arch/arm/boot/dts/at91sam9x35ek.dtb > > okay, but difference in size are not impressive. But it is true that: > - it can grow a little if we switch LCD to full DT > - each bit saved can have an influence on boot time > but it will not be a decisive factor. > > > >> Best Regards, > >> J. > >>> Signed-off-by: Boris BREZILLON > >>> --- > >>> arch/arm/boot/dts/at91sam9g25.dtsi | 2 + > >>> arch/arm/boot/dts/at91sam9g35.dtsi | 1 + > >>> arch/arm/boot/dts/at91sam9x25.dtsi | 24 ++--------- > >>> arch/arm/boot/dts/at91sam9x35.dtsi | 1 + > >>> arch/arm/boot/dts/at91sam9x5.dtsi | 67 ------------------------------ > >>> arch/arm/boot/dts/at91sam9x5_macb0.dtsi | 56 +++++++++++++++++++++++++ > >>> arch/arm/boot/dts/at91sam9x5_macb1.dtsi | 44 ++++++++++++++++++++ > >>> arch/arm/boot/dts/at91sam9x5_usart3.dtsi | 51 +++++++++++++++++++++++ > >>> 8 files changed, 158 insertions(+), 88 deletions(-) > >>> create mode 100644 arch/arm/boot/dts/at91sam9x5_macb0.dtsi > >>> create mode 100644 arch/arm/boot/dts/at91sam9x5_macb1.dtsi > >>> create mode 100644 arch/arm/boot/dts/at91sam9x5_usart3.dtsi > >>> > >>> diff --git a/arch/arm/boot/dts/at91sam9g25.dtsi b/arch/arm/boot/dts/at91sam9g25.dtsi > >>> index b4ec6fe..17b8799 100644 > >>> --- a/arch/arm/boot/dts/at91sam9g25.dtsi > >>> +++ b/arch/arm/boot/dts/at91sam9g25.dtsi > >>> @@ -7,6 +7,8 @@ > >>> */ > >>> > >>> #include "at91sam9x5.dtsi" > >>> +#include "at91sam9x5_usart3.dtsi" > >>> +#include "at91sam9x5_macb0.dtsi" > >>> > >>> / { > >>> model = "Atmel AT91SAM9G25 SoC"; > >>> diff --git a/arch/arm/boot/dts/at91sam9g35.dtsi b/arch/arm/boot/dts/at91sam9g35.dtsi > >>> index bebf9f5..e35c2fc 100644 > >>> --- a/arch/arm/boot/dts/at91sam9g35.dtsi > >>> +++ b/arch/arm/boot/dts/at91sam9g35.dtsi > >>> @@ -7,6 +7,7 @@ > >>> */ > >>> > >>> #include "at91sam9x5.dtsi" > >>> +#include "at91sam9x5_macb0.dtsi" > >>> > >>> / { > >>> model = "Atmel AT91SAM9G35 SoC"; > >>> diff --git a/arch/arm/boot/dts/at91sam9x25.dtsi b/arch/arm/boot/dts/at91sam9x25.dtsi > >>> index 49e94ab..c255421 100644 > >>> --- a/arch/arm/boot/dts/at91sam9x25.dtsi > >>> +++ b/arch/arm/boot/dts/at91sam9x25.dtsi > >>> @@ -7,6 +7,9 @@ > >>> */ > >>> > >>> #include "at91sam9x5.dtsi" > >>> +#include "at91sam9x5_usart3.dtsi" > >>> +#include "at91sam9x5_macb0.dtsi" > >>> +#include "at91sam9x5_macb1.dtsi" > >>> > >>> / { > >>> model = "Atmel AT91SAM9X25 SoC"; > >>> @@ -22,27 +25,6 @@ > >>> 0x80000000 0xfffd0000 0xb83fffff /* pioC */ > >>> 0x003fffff 0x003f8000 0x00000000 /* pioD */ > >>> >; > >>> - > >>> - macb1 { > >>> - pinctrl_macb1_rmii: macb1_rmii-0 { > >>> - atmel,pins = > >>> - >>> - AT91_PIOC 18 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC18 periph B */ > >>> - AT91_PIOC 19 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC19 periph B */ > >>> - AT91_PIOC 20 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC20 periph B */ > >>> - AT91_PIOC 21 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC21 periph B */ > >>> - AT91_PIOC 27 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC27 periph B */ > >>> - AT91_PIOC 28 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC28 periph B */ > >>> - AT91_PIOC 29 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC29 periph B */ > >>> - AT91_PIOC 30 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC30 periph B */ > >>> - AT91_PIOC 31 AT91_PERIPH_B AT91_PINCTRL_NONE>; /* PC31 periph B */ > >>> - }; > >>> - }; > >>> - }; > >>> - > >>> - macb1: ethernet@f8030000 { > >>> - pinctrl-names = "default"; > >>> - pinctrl-0 = <&pinctrl_macb1_rmii>; > >>> }; > >>> }; > >>> }; > >>> diff --git a/arch/arm/boot/dts/at91sam9x35.dtsi b/arch/arm/boot/dts/at91sam9x35.dtsi > >>> index 1a3d525..8eac66c 100644 > >>> --- a/arch/arm/boot/dts/at91sam9x35.dtsi > >>> +++ b/arch/arm/boot/dts/at91sam9x35.dtsi > >>> @@ -7,6 +7,7 @@ > >>> */ > >>> > >>> #include "at91sam9x5.dtsi" > >>> +#include "at91sam9x5_macb0.dtsi" > >>> > >>> / { > >>> model = "Atmel AT91SAM9X35 SoC"; > >>> diff --git a/arch/arm/boot/dts/at91sam9x5.dtsi b/arch/arm/boot/dts/at91sam9x5.dtsi > >>> index 57d45f5..05f4c74 100644 > >>> --- a/arch/arm/boot/dts/at91sam9x5.dtsi > >>> +++ b/arch/arm/boot/dts/at91sam9x5.dtsi > >>> @@ -206,29 +206,6 @@ > >>> }; > >>> }; > >>> > >>> - usart3 { > >>> - pinctrl_usart3: usart3-0 { > >>> - atmel,pins = > >>> - >>> - AT91_PIOC 23 AT91_PERIPH_B AT91_PINCTRL_NONE>; /* PC23 periph B */ > >>> - }; > >>> - > >>> - pinctrl_usart3_rts: usart3_rts-0 { > >>> - atmel,pins = > >>> - ; /* PC24 periph B */ > >>> - }; > >>> - > >>> - pinctrl_usart3_cts: usart3_cts-0 { > >>> - atmel,pins = > >>> - ; /* PC25 periph B */ > >>> - }; > >>> - > >>> - pinctrl_usart3_sck: usart3_sck-0 { > >>> - atmel,pins = > >>> - ; /* PC26 periph B */ > >>> - }; > >>> - }; > >>> - > >>> uart0 { > >>> pinctrl_uart0: uart0-0 { > >>> atmel,pins = > >>> @@ -277,34 +254,6 @@ > >>> }; > >>> }; > >>> > >>> - macb0 { > >>> - pinctrl_macb0_rmii: macb0_rmii-0 { > >>> - atmel,pins = > >>> - >>> - AT91_PIOB 1 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB1 periph A */ > >>> - AT91_PIOB 2 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB2 periph A */ > >>> - AT91_PIOB 3 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB3 periph A */ > >>> - AT91_PIOB 4 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB4 periph A */ > >>> - AT91_PIOB 5 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB5 periph A */ > >>> - AT91_PIOB 6 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB6 periph A */ > >>> - AT91_PIOB 7 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB7 periph A */ > >>> - AT91_PIOB 9 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB9 periph A */ > >>> - AT91_PIOB 10 AT91_PERIPH_A AT91_PINCTRL_NONE>; /* PB10 periph A */ > >>> - }; > >>> - > >>> - pinctrl_macb0_rmii_mii: macb0_rmii_mii-0 { > >>> - atmel,pins = > >>> - >>> - AT91_PIOB 11 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB11 periph A */ > >>> - AT91_PIOB 12 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB12 periph A */ > >>> - AT91_PIOB 13 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB13 periph A */ > >>> - AT91_PIOB 14 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB14 periph A */ > >>> - AT91_PIOB 15 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB15 periph A */ > >>> - AT91_PIOB 16 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB16 periph A */ > >>> - AT91_PIOB 17 AT91_PERIPH_A AT91_PINCTRL_NONE>; /* PB17 periph A */ > >>> - }; > >>> - }; > >>> - > >>> mmc0 { > >>> pinctrl_mmc0_slot0_clk_cmd_dat0: mmc0_slot0_clk_cmd_dat0-0 { > >>> atmel,pins = > >>> @@ -605,22 +554,6 @@ > >>> status = "disabled"; > >>> }; > >>> > >>> - macb0: ethernet@f802c000 { > >>> - compatible = "cdns,at32ap7000-macb", "cdns,macb"; > >>> - reg = <0xf802c000 0x100>; > >>> - interrupts = <24 IRQ_TYPE_LEVEL_HIGH 3>; > >>> - pinctrl-names = "default"; > >>> - pinctrl-0 = <&pinctrl_macb0_rmii>; > >>> - status = "disabled"; > >>> - }; > >>> - > >>> - macb1: ethernet@f8030000 { > >>> - compatible = "cdns,at32ap7000-macb", "cdns,macb"; > >>> - reg = <0xf8030000 0x100>; > >>> - interrupts = <27 IRQ_TYPE_LEVEL_HIGH 3>; > >>> - status = "disabled"; > >>> - }; > >>> - > >>> i2c0: i2c@f8010000 { > >>> compatible = "atmel,at91sam9x5-i2c"; > >>> reg = <0xf8010000 0x100>; > >>> diff --git a/arch/arm/boot/dts/at91sam9x5_macb0.dtsi b/arch/arm/boot/dts/at91sam9x5_macb0.dtsi > >>> new file mode 100644 > >>> index 0000000..55731ff > >>> --- /dev/null > >>> +++ b/arch/arm/boot/dts/at91sam9x5_macb0.dtsi > >>> @@ -0,0 +1,56 @@ > >>> +/* > >>> + * at91sam9x5_macb0.dtsi - Device Tree Include file for AT91SAM9x5 SoC with 1 > >>> + * Ethernet interface. > >>> + * > >>> + * Copyright (C) 2013 Boris BREZILLON > >>> + * > >>> + * Licensed under GPLv2. > >>> + */ > >>> + > >>> +#include > >>> +#include > >>> + > >>> +/ { > >>> + ahb { > >>> + apb { > >>> + pinctrl@fffff400 { > >>> + macb0 { > >>> + pinctrl_macb0_rmii: macb0_rmii-0 { > >>> + atmel,pins = > >>> + >>> + AT91_PIOB 1 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB1 periph A */ > >>> + AT91_PIOB 2 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB2 periph A */ > >>> + AT91_PIOB 3 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB3 periph A */ > >>> + AT91_PIOB 4 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB4 periph A */ > >>> + AT91_PIOB 5 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB5 periph A */ > >>> + AT91_PIOB 6 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB6 periph A */ > >>> + AT91_PIOB 7 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB7 periph A */ > >>> + AT91_PIOB 9 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB9 periph A */ > >>> + AT91_PIOB 10 AT91_PERIPH_A AT91_PINCTRL_NONE>; /* PB10 periph A */ > >>> + }; > >>> + > >>> + pinctrl_macb0_rmii_mii: macb0_rmii_mii-0 { > >>> + atmel,pins = > >>> + >>> + AT91_PIOB 11 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB11 periph A */ > >>> + AT91_PIOB 12 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB12 periph A */ > >>> + AT91_PIOB 13 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB13 periph A */ > >>> + AT91_PIOB 14 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB14 periph A */ > >>> + AT91_PIOB 15 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB15 periph A */ > >>> + AT91_PIOB 16 AT91_PERIPH_A AT91_PINCTRL_NONE /* PB16 periph A */ > >>> + AT91_PIOB 17 AT91_PERIPH_A AT91_PINCTRL_NONE>; /* PB17 periph A */ > >>> + }; > >>> + }; > >>> + }; > >>> + > >>> + macb0: ethernet@f802c000 { > >>> + compatible = "cdns,at32ap7000-macb", "cdns,macb"; > >>> + reg = <0xf802c000 0x100>; > >>> + interrupts = <24 IRQ_TYPE_LEVEL_HIGH 3>; > >>> + pinctrl-names = "default"; > >>> + pinctrl-0 = <&pinctrl_macb0_rmii>; > >>> + status = "disabled"; > >>> + }; > >>> + }; > >>> + }; > >>> +}; > >>> diff --git a/arch/arm/boot/dts/at91sam9x5_macb1.dtsi b/arch/arm/boot/dts/at91sam9x5_macb1.dtsi > >>> new file mode 100644 > >>> index 0000000..77425a6 > >>> --- /dev/null > >>> +++ b/arch/arm/boot/dts/at91sam9x5_macb1.dtsi > >>> @@ -0,0 +1,44 @@ > >>> +/* > >>> + * at91sam9x5_macb1.dtsi - Device Tree Include file for AT91SAM9x5 SoC with 2 > >>> + * Ethernet interfaces. > >>> + * > >>> + * Copyright (C) 2013 Boris BREZILLON > >>> + * > >>> + * Licensed under GPLv2. > >>> + */ > >>> + > >>> +#include > >>> +#include > >>> + > >>> +/ { > >>> + ahb { > >>> + apb { > >>> + pinctrl@fffff400 { > >>> + macb1 { > >>> + pinctrl_macb1_rmii: macb1_rmii-0 { > >>> + atmel,pins = > >>> + >>> + AT91_PIOC 18 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC18 periph B */ > >>> + AT91_PIOC 19 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC19 periph B */ > >>> + AT91_PIOC 20 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC20 periph B */ > >>> + AT91_PIOC 21 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC21 periph B */ > >>> + AT91_PIOC 27 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC27 periph B */ > >>> + AT91_PIOC 28 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC28 periph B */ > >>> + AT91_PIOC 29 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC29 periph B */ > >>> + AT91_PIOC 30 AT91_PERIPH_B AT91_PINCTRL_NONE /* PC30 periph B */ > >>> + AT91_PIOC 31 AT91_PERIPH_B AT91_PINCTRL_NONE>; /* PC31 periph B */ > >>> + }; > >>> + }; > >>> + }; > >>> + > >>> + macb1: ethernet@f8030000 { > >>> + compatible = "cdns,at32ap7000-macb", "cdns,macb"; > >>> + reg = <0xf8030000 0x100>; > >>> + interrupts = <27 IRQ_TYPE_LEVEL_HIGH 3>; > >>> + pinctrl-names = "default"; > >>> + pinctrl-0 = <&pinctrl_macb1_rmii>; > >>> + status = "disabled"; > >>> + }; > >>> + }; > >>> + }; > >>> +}; > >>> diff --git a/arch/arm/boot/dts/at91sam9x5_usart3.dtsi b/arch/arm/boot/dts/at91sam9x5_usart3.dtsi > >>> new file mode 100644 > >>> index 0000000..5589579 > >>> --- /dev/null > >>> +++ b/arch/arm/boot/dts/at91sam9x5_usart3.dtsi > >>> @@ -0,0 +1,51 @@ > >>> +/* > >>> + * at91sam9x5_lcdc.dtsi - Device Tree Include file for AT91SAM9x5 SoC with > >>> + * 4 USART. > >>> + * > >>> + * Copyright (C) 2013 Boris BREZILLON > >>> + * > >>> + * Licensed under GPLv2. > >>> + */ > >>> + > >>> +#include > >>> +#include > >>> + > >>> +/ { > >>> + ahb { > >>> + apb { > >>> + pinctrl@fffff400 { > >>> + usart3 { > >>> + pinctrl_usart3: usart3-0 { > >>> + atmel,pins = > >>> + >>> + AT91_PIOC 23 AT91_PERIPH_B AT91_PINCTRL_NONE>; /* PC23 periph B */ > >>> + }; > >>> + > >>> + pinctrl_usart3_rts: usart3_rts-0 { > >>> + atmel,pins = > >>> + ; /* PC24 periph B */ > >>> + }; > >>> + > >>> + pinctrl_usart3_cts: usart3_cts-0 { > >>> + atmel,pins = > >>> + ; /* PC25 periph B */ > >>> + }; > >>> + > >>> + pinctrl_usart3_sck: usart3_sck-0 { > >>> + atmel,pins = > >>> + ; /* PC26 periph B */ > >>> + }; > >>> + }; > >>> + }; > >>> + > >>> + usart3: serial@f8028000 { > >>> + compatible = "atmel,at91sam9260-usart"; > >>> + reg = <0xf8028000 0x200>; > >>> + interrupts = <8 IRQ_TYPE_LEVEL_HIGH 5>; > >>> + pinctrl-names = "default"; > >>> + pinctrl-0 = <&pinctrl_usart3>; > >>> + status = "disabled"; > >>> + }; > >>> + }; > >>> + }; > >>> +}; > >>> -- > >>> 1.7.9.5 > >>> > > > > > > > -- > Nicolas Ferre -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/