WIP: fix linking error concerning inline · Pull Request !47 · hinus/linux_kernel_011

当前master在构建时会报一些符号多重定义，符号未定义的error:
```
ld -m elf_i386 -r -o mm.o swap.o memory.o page.o
make[2]: Leaving directory '/home/lijinpei/Development/linux_kernel_011/mm'
ar rcs lib.a ctype.o write.o string.o open.o dup.o
sync
ar rcs chr_drv.a tty_io.o console.o keyboard.o kboard.o
sync
make[2]: Leaving directory '/home/lijinpei/Development/linux_kernel_011/lib'
make[2]: Leaving directory '/home/lijinpei/Development/linux_kernel_011/kernel/chr_drv'
ar rcs blk_drv.a hd.o ll_rw_blk.o floppy.o
sync
make[2]: Leaving directory '/home/lijinpei/Development/linux_kernel_011/kernel/blk_drv'
ld -m elf_i386 -r -o fs.o read_write.o buffer.o super.o open.o file_table.o inode.o namei.o fcntl.o char_dev.o bitmap.o truncate.o
namei.o: In function `get_fs_byte':
namei.c:(.text+0x0): multiple definition of `get_fs_byte'
open.o:open.c:(.text+0x0): first defined here
namei.o: In function `put_fs_byte':
namei.c:(.text+0xe): multiple definition of `put_fs_byte'
open.o:open.c:(.text+0xe): first defined here
fcntl.o: In function `get_fs_byte':
fcntl.c:(.text+0x0): multiple definition of `get_fs_byte'
open.o:open.c:(.text+0x0): first defined here
fcntl.o: In function `put_fs_byte':
fcntl.c:(.text+0xe): multiple definition of `put_fs_byte'
open.o:open.c:(.text+0xe): first defined here
char_dev.o: In function `get_fs_byte':
char_dev.c:(.text+0x0): multiple definition of `get_fs_byte'
open.o:open.c:(.text+0x0): first defined here
char_dev.o: In function `put_fs_byte':
char_dev.c:(.text+0xe): multiple definition of `put_fs_byte'
open.o:open.c:(.text+0xe): first defined here
Makefile:9: recipe for target 'fs.o' failed
make[2]: *** [fs.o] Error 1
make[2]: Leaving directory '/home/lijinpei/Development/linux_kernel_011/fs'
ld -Ttext 0x0 -s --oformat binary -m elf_i386 -M -e startup_32 -o system head.o main.o sys_call.o asm.o sched.o printk.o vsprintf.o traps.o fork.o panic.o chr_drv/chr_drv.a blk_drv/blk_drv.a ../mm/mm.o ../lib/lib.a ../fs/fs.o > System.map
blk_drv/blk_drv.a(hd.o): In function `get_fs_byte':
hd.c:(.text+0x0): multiple definition of `get_fs_byte'
chr_drv/chr_drv.a(tty_io.o):tty_io.c:(.text+0x0): first defined here
blk_drv/blk_drv.a(hd.o): In function `put_fs_byte':
hd.c:(.text+0xe): multiple definition of `put_fs_byte'
chr_drv/chr_drv.a(tty_io.o):tty_io.c:(.text+0xe): first defined here
blk_drv/blk_drv.a(floppy.o): In function `get_fs_byte':
floppy.c:(.text+0x0): multiple definition of `get_fs_byte'
chr_drv/chr_drv.a(tty_io.o):tty_io.c:(.text+0x0): first defined here
blk_drv/blk_drv.a(floppy.o): In function `put_fs_byte':
floppy.c:(.text+0xe): multiple definition of `put_fs_byte'
chr_drv/chr_drv.a(tty_io.o):tty_io.c:(.text+0xe): first defined here
ld: cannot find ../fs/fs.o: No such file or directory
Makefile:9: recipe for target 'system' failed
make[1]: *** [system] Error 1
make[1]: Leaving directory '/home/lijinpei/Development/linux_kernel_011/kernel'
./tools/build bootsect setup kernel/system > linux.img
Root device is (2, 29)
Boot sector 512 bytes.
Setup is 391 bytes.
Unable to open 'system'
Makefile:9: recipe for target 'linux.img' failed
make: *** [linux.img] Error 1
```
这个MR可以解决这些问题。
但是C的inline的具体规则：inline, static inline, extern inline, 一个inline声明 + 另一个声明我还不清楚。
也没有仔细确认生成的obj中是否有/没有相应的符号。

类型	指派人员	状态
审查	hinus 已审查通过	已完成 (1/1人)
测试	hinus 已测试通过	已完成 (1/1人)

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