Fabio M. De Francesco 9f25f357c5 hfsplus: convert kmap() to kmap_local_page() in btree.c ... kmap() is being deprecated in favor of kmap_local_page(). There are two main problems with kmap(): (1) It comes with an overhead as mapping space is restricted and protected by a global lock for synchronization and (2) it also requires global TLB invalidation when the kmap's pool wraps and it might block when the mapping space is fully utilized until a slot becomes available. With kmap_local_page() the mappings are per thread, CPU local, can take page faults, and can be called from any context (including interrupts). It is faster than kmap() in kernels with HIGHMEM enabled. Furthermore, the tasks can be preempted and, when they are scheduled to run again, the kernel virtual addresses are restored and are still valid. Since its use in btree.c is safe everywhere, it should be preferred. Therefore, replace kmap() with kmap_local_page() in btree.c. Tested in a QEMU/KVM x86_32 VM, 6GB RAM, booting a kernel with HIGHMEM64GB enabled. Link: https://lkml.kernel.org/r/20220809203105.26183-5-fmdefrancesco@gmail.com Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com> Suggested-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Viacheslav Dubeyko <slava@dubeyko.com> Cc: Bart Van Assche <bvanassche@acm.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Kees Cook <keescook@chromium.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Muchun Song <songmuchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2022-09-11 21:55:05 -07:00
..
attributes.c
bfind.c
bitmap.c	hfsplus: convert kmap() to kmap_local_page() in bitmap.c	2022-09-11 21:55:04 -07:00
bnode.c	hfsplus: convert kmap() to kmap_local_page() in bnode.c	2022-09-11 21:55:04 -07:00
brec.c
btree.c	hfsplus: convert kmap() to kmap_local_page() in btree.c	2022-09-11 21:55:05 -07:00
catalog.c
dir.c
extents.c	hfsplus: Call hfsplus_write_begin() and generic_write_end() directly	2022-05-08 14:45:56 -04:00
hfsplus_fs.h	fs/hfsplus: Use the enum req_op and blk_opf_t types	2022-07-14 12:14:32 -06:00
hfsplus_raw.h	hfsplus: use struct_group_attr() for memcpy() region	2022-01-20 08:52:54 +02:00
inode.c	fs: Change try_to_free_buffers() to take a folio	2022-05-09 23:12:34 -04:00
ioctl.c
Kconfig
Makefile
options.c
part_tbl.c	fs/hfsplus: Use the enum req_op and blk_opf_t types	2022-07-14 12:14:32 -06:00
super.c	fs/hfsplus: Use the enum req_op and blk_opf_t types	2022-07-14 12:14:32 -06:00
tables.c
unicode.c
wrapper.c	fs/hfsplus: Use the enum req_op and blk_opf_t types	2022-07-14 12:14:32 -06:00
xattr.c	hfsplus: use struct_group_attr() for memcpy() region	2022-01-20 08:52:54 +02:00
xattr.h
xattr_security.c
xattr_trusted.c
xattr_user.c