linux-kernel - Re: [linux-usb-devel] 2.6.19-rc5: modular USB rebuilds vmlinux?

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Message-Id: <200611222212.44360.arvidjaar@mail.ru>
Date:	Wed, 22 Nov 2006 22:12:43 +0300
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	linux-usb-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [linux-usb-devel] 2.6.19-rc5: modular USB rebuilds vmlinux?

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On Wednesday 22 November 2006 21:54, Randy Dunlap wrote:
> On Wed, 22 Nov 2006 21:45:55 +0300 Andrey Borzenkov wrote:
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> >
> > I was under impression that I have fully modular USB. Still:
> >
> > {pts/1}% make -C ~/src/linux-git O=$HOME/build/linux-2.6.19
> > make: Entering directory `/home/bor/src/linux-git'
> >   GEN     /home/bor/build/linux-2.6.19/Makefile
> > scripts/kconfig/conf -s arch/i386/Kconfig
> >   Using /home/bor/src/linux-git as source for kernel
> >   GEN     /home/bor/build/linux-2.6.19/Makefile
> >   CHK     include/linux/version.h
> >   CHK     include/linux/utsrelease.h
> >   CHK     include/linux/compile.h
> >   CC [M]  drivers/usb/core/usb.o
> >   CC [M]  drivers/usb/core/hub.o
> >   CC [M]  drivers/usb/core/hcd.o
> >   CC [M]  drivers/usb/core/urb.o
> >   CC [M]  drivers/usb/core/message.o
> >   CC [M]  drivers/usb/core/driver.o
> >   CC [M]  drivers/usb/core/config.o
> >   CC [M]  drivers/usb/core/file.o
> >   CC [M]  drivers/usb/core/buffer.o
> >   CC [M]  drivers/usb/core/sysfs.o
> >   CC [M]  drivers/usb/core/endpoint.o
> >   CC [M]  drivers/usb/core/devio.o
> >   CC [M]  drivers/usb/core/notify.o
> >   CC [M]  drivers/usb/core/generic.o
> >   CC [M]  drivers/usb/core/hcd-pci.o
> >   CC [M]  drivers/usb/core/inode.o
> >   CC [M]  drivers/usb/core/devices.o
> >   LD [M]  drivers/usb/core/usbcore.o
> >   CC      drivers/usb/host/pci-quirks.o
> >   LD      drivers/usb/host/built-in.o
> >
> > Sorry? How comes it still compiles something into main kernel?
>
> It's just a quirk of the build machinery.
> The built-in.o file should be 8 bytes or so, with nothing
> really in it.
>

yes, but it still costs extra vmlinuz build when just to rebuild of a single 
module (or subsystem as was in this case) is needed. And this implies also 
reboot - how should one know if this is safe to leave current kernel with new 
modules?

> >  {pts/0}% grep USB build/linux-2.6.19/.config | grep -v '^#'
> > CONFIG_USB_ARCH_HAS_HCD=y
> > CONFIG_USB_ARCH_HAS_OHCI=y
> > CONFIG_USB_ARCH_HAS_EHCI=y
> > CONFIG_USB=m
> > CONFIG_USB_DEBUG=y
> > CONFIG_USB_DEVICEFS=y
> > CONFIG_USB_BANDWIDTH=y
> > CONFIG_USB_DYNAMIC_MINORS=y
> > CONFIG_USB_SUSPEND=y
> > CONFIG_USB_OHCI_HCD=m
> > CONFIG_USB_OHCI_LITTLE_ENDIAN=y
> > CONFIG_USB_ACM=m
> > CONFIG_USB_PRINTER=m
> > CONFIG_USB_STORAGE=m
> > CONFIG_USB_STORAGE_DATAFAB=y
> > CONFIG_USB_STORAGE_FREECOM=y
> > CONFIG_USB_STORAGE_ISD200=y
> > CONFIG_USB_STORAGE_DPCM=y
> > CONFIG_USB_STORAGE_USBAT=y
> > CONFIG_USB_STORAGE_SDDR09=y
> > CONFIG_USB_STORAGE_SDDR55=y
> > CONFIG_USB_STORAGE_JUMPSHOT=y
> > CONFIG_USB_KBD=m
> > CONFIG_USB_MOUSE=m
> > CONFIG_USB_SERIAL=m
> > CONFIG_USB_SERIAL_GENERIC=y
> > CONFIG_USB_SERIAL_PL2303=m
>
> ---
> ~Randy
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