Linux device driver III:KBUILD_NOPEDANTIC & Fix it to use EXTRA_CFLAGS

For the "Linux device driver III", the example of "chapter 4":
Delete the <linux/config.h>
Add the <linux/sched.h>

Ok, now change into its derectory and complile it like this:

[root@localhost scull]# make
make -C /lib/modules/2.6.24.2-2lp/build M=/root/Desktop/examples/scull LDDINC=/root/Desktop/examples/scull/../include modules
make[1]: Entering directory `/usr/src/kernels/2.6.24.2-2lp-i686'
scripts/Makefile.build:46: *** CFLAGS was changed in "/root/Desktop/examples/scull/Makefile". Fix it to use EXTRA_CFLAGS. Stop.
make[1]: *** [_module_/root/Desktop/examples/scull] Error 2
make[1]: Leaving directory `/usr/src/kernels/2.6.24.2-2lp-i686'
make: *** [modules] Error 2

There are two kind of method to solve this problem:

(1)Rplace all CFLAGS with EXTRA_CFLAGS in the Makefile.

(2)Using the KBUILD_NOPEDANTIC arg
[root@localhost scull]# make KBUILD_NOPEDANTIC=1
make -C /lib/modules/2.6.24.2-2lp/build M=/root/Desktop/examples/scull LDDINC=/root/Desktop/examples/scull/../include modules
make[1]: Entering directory `/usr/src/kernels/2.6.24.2-2lp-i686'
CC [M] /root/Desktop/examples/scull/main.o
CC [M] /root/Desktop/examples/scull/pipe.o
CC [M] /root/Desktop/examples/scull/access.o
LD [M] /root/Desktop/examples/scull/scull.o
Building modules, stage 2.
MODPOST 1 modules
CC      /root/Desktop/examples/scull/scull.mod.o
LD [M] /root/Desktop/examples/scull/scull.ko
make[1]: Leaving directory `/usr/src/kernels/2.6.24.2-2lp-i686'

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