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Linux kernel modules makefiles doubts

 
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Old 06-18-2012
Linux kernel modules makefiles doubts
This query is regarding the makefiles of linux kernel modules.
I saw at some sites on net it is suggesting to include the following path:
KERNEL_SOURCE := /usr/src/linux...

while at some places it is askibg to include /lib/modules path:
KERNEL_SOURCE := /lib/modules/2.6.27-7-generic/build

I see that lib/modules links to the usr/src/linux... folder.

What is the difference between the two paths and how it will impact me if I include the first path?
 
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LEARN ABOUT CENTOS

modules-load.d

MODULES-LOAD.D(5)						  modules-load.d						 MODULES-LOAD.D(5)

NAME

       modules-load.d - Configure kernel modules to load at boot

SYNOPSIS

       /etc/modules-load.d/*.conf

       /run/modules-load.d/*.conf

       /usr/lib/modules-load.d/*.conf

DESCRIPTION

       systemd-modules-load.service(8) reads files from the above directories which contain kernel modules to load during boot in a static list.
       Each configuration file is named in the style of /etc/modules-load.d/program.conf. Note that it is usually a better idea to rely on the
       automatic module loading by PCI IDs, USB IDs, DMI IDs or similar triggers encoded in the kernel modules themselves instead of static
       configuration like this. In fact, most modern kernel modules are prepared for automatic loading already.

CONFIGURATION FORMAT

       The configuration files should simply contain a list of kernel module names to load, separated by newlines. Empty lines and lines whose
       first non-whitespace character is # or ; are ignored.

       Each configuration file shall be named in the style of program.conf. Files in /etc/ override files with the same name in /usr/lib/ and
       /run/. Files in /run/ override files with the same name in /usr/lib/. Packages should install their configuration files in /usr/lib/, files
       in /etc/ are reserved for the local administrator, who may use this logic to override the configuration files installed from vendor
       packages.

       If the administrator wants to disable a configuration file supplied by the vendor, the recommended way is to place a symlink to /dev/null
       in /etc/modules-load.d/ bearing the same filename.

EXAMPLE

       Example 1. /etc/modules-load.d/virtio-net.conf example:

	   # Load virtio-net.ko at boot
	   virtio-net

SEE ALSO

       systemd(1), systemd-modules-load.service(8), systemd-delta(1), modprobe(8)

systemd 208															 MODULES-LOAD.D(5)