fs: exfat: Add support for building inside kernel

Change-Id: I963dfd24ffbb488efcbb7a504e9b811f54adcff7
Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
Signed-off-by: Tashfin Shakeer Rhythm <tashfinshakeerrhythm@gmail.com>
Signed-off-by: TogoFire <italomellopereira@gmail.com>

fs/Kconfig

@@ -122,10 +122,11 @@ endmenu
 endif # BLOCK
 
 if BLOCK
-menu "DOS/FAT/SDFAT/NT Filesystems"
+menu "DOS/FAT/EXFAT/SDFAT/NT Filesystems"
 
 source "fs/fat/Kconfig"
 source "fs/sdfat/Kconfig"
+source "fs/exfat/Kconfig"
 source "fs/ntfs/Kconfig"
 
 endmenu

fs/Makefile

@@ -79,6 +79,7 @@ obj-$(CONFIG_CODA_FS)		+= coda/
 obj-$(CONFIG_MINIX_FS)		+= minix/
 obj-$(CONFIG_FAT_FS)		+= fat/
 obj-$(CONFIG_SDFAT_FS)		+= sdfat/
+obj-$(CONFIG_EXFAT_FS)		+= exfat/
 obj-$(CONFIG_BFS_FS)		+= bfs/
 obj-$(CONFIG_ISO9660_FS)	+= isofs/
 obj-$(CONFIG_HFSPLUS_FS)	+= hfsplus/ # Before hfs to find wrapped HFS+

fs/exfat/Makefile

@@ -2,39 +2,7 @@
 #
 # Makefile for the linux exFAT filesystem support.
 #
-ifneq ($(KERNELRELEASE),)
 obj-$(CONFIG_EXFAT_FS) += exfat.o
 
 exfat-y	:= inode.o namei.o dir.o super.o fatent.o cache.o nls.o misc.o \
 	   file.o balloc.o
-else
-# Called from external kernel module build
-
-KERNELRELEASE	?= $(shell uname -r)
-KDIR	?= /lib/modules/${KERNELRELEASE}/build
-MDIR	?= /lib/modules/${KERNELRELEASE}
-PWD	:= $(shell pwd)
-
-export CONFIG_EXFAT_FS := m
-
-all:
-	$(MAKE) -C $(KDIR) M=$(PWD) modules
-
-clean:
-	$(MAKE) -C $(KDIR) M=$(PWD) clean
-
-help:
-	$(MAKE) -C $(KDIR) M=$(PWD) help
-
-install: exfat.ko
-	rm -f ${MDIR}/kernel/fs/exfat/exfat.ko
-	install -m644 -b -D exfat.ko ${MDIR}/kernel/fs/exfat/exfat.ko
-	depmod -aq
-
-uninstall:
-	rm -rf ${MDIR}/kernel/fs/exfat
-	depmod -aq
-
-endif
-
-.PHONY : all clean install uninstall