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review.shift-gmbh.com / SHIFTPHONES / android_kernel_shift_sdm845 / 2a0d7a848f60be6a16202ac60328d9ae17757665
commit2a0d7a848f60be6a16202ac60328d9ae17757665[log] [tgz]
authorJohn Sanpe <sanpeqf@gmail.com>Fri Dec 29 23:04:09 2023 +0900
committerNamjae Jeon <linkinjeon@kernel.org>Fri Dec 29 23:04:46 2023 +0900
tree6852b18f5843d49bfdb2bb8faca5ae45db23263d
parent3ad149047d1acf158f327b3f0279d3d8b03bc894 [diff]
exfat: using hweight instead of internal logic

Replace the internal table lookup algorithm with the hweight
library, which has instruction set acceleration capabilities.

Use it to increase the length of a single calculation of
the exfat_find_free_bitmap function to the long type.

Signed-off-by: John Sanpe <sanpeqf@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
1 file changed
tree: 6852b18f5843d49bfdb2bb8faca5ae45db23263d
  1. .github/
  2. balloc.c
  3. cache.c
  4. dir.c
  5. exfat_fs.h
  6. exfat_raw.h
  7. fatent.c
  8. file.c
  9. inode.c
  10. Kconfig
  11. Makefile
  12. misc.c
  13. namei.c
  14. nls.c
  15. README.md
  16. super.c
README.md

exFAT filesystem

This is the exfat filesystem for support from the linux 4.1 kernel to the latest kernel.

Installing as a stand-alone module

Install prerequisite package for Fedora, RHEL:

	yum install kernel-devel-$(uname -r)

Build step:

	make
	sudo make install

To load the driver manually, run this as root:

	modprobe exfat

Installing as a part of the kernel

  1. Let's take [linux] as the path to your kernel source dir.
	cd [linux]
	cp -ar exfat [linux]/fs/
  1. edit [linux]/fs/Kconfig
	source "fs/fat/Kconfig"
	+source "fs/exfat/Kconfig"
	source "fs/ntfs/Kconfig"
  1. edit [linux]/fs/Makefile
	obj-$(CONFIG_FAT_FS)          += fat/
	+obj-$(CONFIG_EXFAT_FS)       += exfat/
	obj-$(CONFIG_BFS_FS)          += bfs/
  1. make menuconfig and set exfat
	File systems  --->
		DOS/FAT/NT Filesystems  --->
			<M> exFAT filesystem support
			(utf8) Default iocharset for exFAT

build your kernel