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Ira Weiny defdaff15a checkpatch: add kmap and kmap_atomic to the deprecated list 
kmap() and kmap_atomic() are 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.

kmap_local_page() is safe from any context and is therefore redundant with
kmap_atomic() with the exception of any pagefault or preemption disable
requirements.  However, using kmap_atomic() for these side effects makes
the code less clear.  So any requirement for pagefault or preemption
disable should be made explicitly.

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.

Link: https://lkml.kernel.org/r/20220813220034.806698-1-ira.weiny@intel.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Suggested-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-09-11 21:55:06 -07:00
..
atomic locking/atomic: Add generic try_cmpxchg64 support 2022-05-18 00:08:27 +02:00
basic randstruct: Move seed generation into scripts/basic/ 2022-05-08 01:33:07 -07:00
clang-tools scripts/clang-tools: Remove DeprecatedOrUnsafeBufferHandling check 2022-08-21 02:47:49 +09:00
coccinelle update Coccinelle URL 2022-08-07 21:30:36 +02:00
dtc h8300: remove stale bindings and symlink 2022-05-20 22:40:56 +02:00
dummy-tools kbuild: dummy-tools: pretend we understand __LONG_DOUBLE_128__ 2022-08-21 02:47:48 +09:00
gcc-plugins treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_385.RULE 2022-06-10 14:51:36 +02:00
gdb Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
genksyms genksyms: adjust the output format to modpost 2022-05-24 16:33:20 +09:00
kconfig kconfig: Qt5: tell the user which packages are required 2022-07-27 21:18:00 +09:00
ksymoops
mod modpost: fix module versioning when a symbol lacks valid CRC 2022-08-21 02:47:36 +09:00
package kbuild: rpm-pkg: fix build error when _arch is undefined 2022-07-27 21:18:00 +09:00
selinux selinux: declare data arrays const 2022-05-03 15:53:49 -04:00
tracing scripts/tracing: Fix typo 'the the' in comment 2022-08-02 15:17:00 -04:00
.gitignore certs: move scripts/extract-cert to certs/ 2022-01-08 18:28:21 +09:00
adjust_autoksyms.sh kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
as-version.sh kbuild: Switch to 'f' variants of integrated assembler flag 2021-09-03 08:17:20 +09:00
asn1_compiler.c
bin2c.c
bloat-o-meter scripts/bloat-o-meter: add -p argument 2022-07-17 17:31:40 -07:00
bootgraph.pl
bpf_doc.py bpf, docs: Use SPDX license identifier in bpf_doc.py 2022-07-22 00:28:14 +02:00
cc-can-link.sh
cc-version.sh kbuild: collect minimum tool versions into scripts/min-tool-version.sh 2021-04-25 05:14:26 +09:00
check_extable.sh scripts: check_extable: fix typo in user error message 2021-09-08 11:50:28 -07:00
check-local-export scripts/check-local-export: avoid 'wait $!' for process substitution 2022-06-10 03:47:13 +09:00
check-sysctl-docs docs: add a script to check sysctl docs 2020-02-25 03:35:16 -07:00
checkdeclares.pl scripts: make some scripts executable 2021-08-10 09:13:25 +09:00
checkincludes.pl
checkkconfigsymbols.py checkkconfigsymbols.py: Remove skipping of help lines in parse_kconfig_file 2021-09-19 10:13:03 +09:00
checkpatch.pl checkpatch: add kmap and kmap_atomic to the deprecated list 2022-09-11 21:55:06 -07:00
checkstack.pl checkstack: add riscv support for scripts/checkstack.pl 2022-07-27 21:18:00 +09:00
checksyscalls.sh checksyscalls: ignore -Wunused-macros 2022-05-08 03:16:59 +09:00
checkversion.pl scripts: checkversion: modernize linux/version.h search strings 2021-08-05 20:55:39 +09:00
cleanfile
cleanpatch
coccicheck scripts: coccicheck: fix troubles on non-English builds 2021-05-18 11:09:59 +02:00
config kconfig: config script: add a little user help 2021-01-04 10:38:11 +09:00
const_structs.checkpatch const_structs.checkpatch: add frequently used ops structs 2022-01-20 08:52:54 +02:00
decode_stacktrace.sh scripts/decode_stacktrace.sh: support old bash version 2022-04-29 14:37:57 -07:00
decodecode scripts/decodecode: improve faulting line determination 2022-09-11 21:55:05 -07:00
depmod.sh depmod: handle the case of /sbin/depmod without /sbin in PATH 2021-01-01 12:26:39 -08:00
dev-needs.sh scripts/dev-needs: Add script to list device dependencies 2020-09-04 18:19:37 +02:00
diffconfig scripts: switch explicitly to Python 3 2021-01-22 06:34:44 +09:00
documentation-file-ref-check scripts: documentation-file-ref-check: fix bpf selftests path 2021-10-26 09:42:29 -06:00
export_report.pl modpost: move the namespace field in Module.symvers last 2020-03-17 08:59:03 +09:00
extract_xc3028.pl
extract-ikconfig
extract-module-sig.pl
extract-sys-certs.pl
extract-vmlinux
faddr2line scripts/faddr2line: Add CONFIG_DEBUG_INFO check 2022-08-02 22:08:17 +02:00
file-size.sh
find-unused-docs.sh
gcc-ld
gcc-x86_32-has-stack-protector.sh x86/stackprotector/32: Make the canary into a regular percpu variable 2021-03-08 13:19:05 +01:00
gcc-x86_64-has-stack-protector.sh
gen_autoksyms.sh kbuild: Ignore __this_module in gen_autoksyms.sh 2022-06-26 06:15:05 +09:00
gen_ksymdeps.sh kbuild: redo fake deps at include/ksym/*.h 2021-09-03 08:17:21 +09:00
gen-randstruct-seed.sh randstruct: Move seed generation into scripts/basic/ 2022-05-08 01:33:07 -07:00
generate_initcall_order.pl init: lto: ensure initcall ordering 2021-01-14 08:21:09 -08:00
get_abi.pl scripts/get_abi: Fix wrong script file name in the help message 2022-04-24 10:38:44 +02:00
get_dvb_firmware
get_feat.pl scripts: get_feat.pl: use /usr/bin/env to find perl 2022-06-30 12:22:17 -06:00
get_maintainer.pl get_maintainer: Honor mailmap for in file emails 2022-04-29 14:38:00 -07:00
gfp-translate
headerdep.pl
headers_install.sh scripts: headers_install.sh: Update config leak ignore entries 2022-07-27 21:18:00 +09:00
insert-sys-cert.c
install.sh kbuild: factor out the common installation code into scripts/install.sh 2022-05-11 21:45:53 +09:00
jobserver-exec scripts/jobserver-exec: Fix a typo ("envirnoment") 2021-05-17 12:10:03 +09:00
kallsyms.c scripts/kallsyms: update usage message of the kallsyms program 2022-05-27 15:51:48 +09:00
Kbuild.include kbuild: add cmd_and_savecmd macro 2022-06-01 23:07:29 +09:00
Kconfig.include kbuild: set EXIT trap before creating temporary directory 2022-08-03 22:56:38 +09:00
kernel-doc scripts: kernel-doc: Always increment warnings counter 2022-06-13 11:07:45 -06:00
ld-version.sh kbuild: collect minimum tool versions into scripts/min-tool-version.sh 2021-04-25 05:14:26 +09:00
leaking_addresses.pl leaking_addresses: Always print a trailing newline 2021-10-15 11:25:13 +02:00
Lindent
link-vmlinux.sh kbuild: factor out the common objtool arguments 2022-06-05 06:20:57 +09:00
Makefile kbuild: Allow kernel installation packaging to override pkg-config 2022-04-05 17:03:31 +09:00
Makefile.asm-generic kbuild: prefix $(srctree)/ to some included Makefiles 2021-03-15 19:20:48 +09:00
Makefile.build kbuild: remove sed command from cmd_ar_builtin 2022-07-27 21:17:59 +09:00
Makefile.clang um: Allow builds with Clang 2022-03-21 08:13:03 -07:00
Makefile.clean kbuild: drop $(objtree)/ prefix support for clean-files 2022-05-08 03:17:00 +09:00
Makefile.compiler kbuild: set EXIT trap before creating temporary directory 2022-08-03 22:56:38 +09:00
Makefile.debug kbuild: split DEBUG_CFLAGS out to scripts/Makefile.debug 2021-10-24 13:48:33 +09:00
Makefile.dtbinst kbuild: prefix $(srctree)/ to some included Makefiles 2021-03-15 19:20:48 +09:00
Makefile.extrawarn scripts/Makefile.extrawarn: Do not disable clang's -Wformat-zero-length 2022-08-21 02:47:48 +09:00
Makefile.gcc-plugins gcc-plugins: Undefine LATENT_ENTROPY_PLUGIN when plugin disabled for a file 2022-08-16 12:25:53 -07:00
Makefile.headersinst kbuild: prefix $(srctree)/ to some included Makefiles 2021-03-15 19:20:48 +09:00
Makefile.host kbuild: sort hostprogs before passing it to ifneq 2020-08-10 01:32:59 +09:00
Makefile.kasan kasan: always respect CONFIG_KASAN_STACK 2021-09-24 16:13:35 -07:00
Makefile.kcov kbuild: include scripts/Makefile.* only when relevant CONFIG is enabled 2020-08-10 01:32:59 +09:00
Makefile.kcsan kcsan: Ignore GCC 11+ warnings about TSan runtime support 2021-12-09 16:42:27 -08:00
Makefile.lib x86/retbleed: Add fine grained Kconfig knobs 2022-06-29 17:43:41 +02:00
Makefile.modfinal kbuild: do not create *.prelink.o for Clang LTO or IBT 2022-05-29 18:39:35 +09:00
Makefile.modinst kbuild: error out if $(INSTALL_MOD_PATH) contains % or : 2022-07-27 21:18:00 +09:00
Makefile.modpost kbuild: do not create *.prelink.o for Clang LTO or IBT 2022-05-29 18:39:35 +09:00
Makefile.package kbuild: rpm-pkg: pass 'linux' to --target option of rpmbuild 2022-07-27 21:18:00 +09:00
Makefile.randstruct randstruct: Enable Clang support 2022-05-08 01:33:07 -07:00
Makefile.ubsan ubsan: remove CONFIG_UBSAN_OBJECT_SIZE 2022-01-20 08:52:55 +02:00
Makefile.userprogs kbuild: add infrastructure to build userspace programs 2020-05-17 18:52:01 +09:00
Makefile.vmlinux kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS 2022-05-24 16:33:20 +09:00
Makefile.vmlinux_o x86/retbleed: Add fine grained Kconfig knobs 2022-06-29 17:43:41 +02:00
makelst
markup_oops.pl
min-tool-version.sh scripts/min-tool-version.sh: raise minimum clang version to 14.0.0 for s390 2022-05-17 15:16:29 +02:00
mkcompile_h sched/preempt: Tell about PREEMPT_DYNAMIC on kernel headers 2022-03-11 15:36:35 +01:00
mksysmap mksysmap: Fix the mismatch of '.L' symbols in System.map 2020-06-06 23:39:20 +09:00
mkuboot.sh
module.lds.S modules: Ensure natural alignment for .altinstructions and __bug_table sections 2022-07-11 10:49:14 -07:00
modules-check.sh kbuild: check module name conflict for external modules as well 2021-04-25 05:22:42 +09:00
nsdeps scripts/nsdeps: adjust to the format change of *.mod files 2022-06-08 20:14:13 +09:00
objdiff kbuild: clean .tmp_* pattern by make clean 2022-06-05 06:20:57 +09:00
objdump-func scripts: Create objdump-func helper script 2022-05-12 10:08:43 -07:00
pahole-flags.sh scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading. 2022-02-22 14:32:44 -08:00
pahole-version.sh kbuild: Add CONFIG_PAHOLE_VERSION 2022-02-02 11:19:33 +01:00
parse-maintainers.pl parse-maintainers: Do not sort section content by default 2020-03-26 15:08:27 -07:00
patch-kernel
profile2linkerlist.pl
prune-kernel scripts/prune-kernel: Use kernel-install if available 2022-05-11 21:46:38 +09:00
recordmcount.c ftrace: Have recordmcount use w8 to read relp->r_info in arm64_is_fake_mcount 2021-03-02 17:27:18 -05:00
recordmcount.h recordmcount: Correct st_shndx handling 2021-06-18 09:09:17 -04:00
recordmcount.pl nds32: Remove the architecture 2022-03-07 13:54:59 +01:00
remove-stale-files RISC-V Patches for the 5.20 Merge Window, Part 2 2022-08-12 18:39:43 -07:00
setlocalversion kbuild: do not quote string values in include/config/auto.conf 2022-01-08 18:03:57 +09:00
show_delta tweewide: Fix most Shebang lines 2020-12-08 23:30:04 +09:00
sign-file.c sign-file: Fix confusing error messages 2022-08-03 23:56:20 +03:00
sorttable.c LoongArch: Add ELF-related definitions 2022-06-03 20:09:27 +08:00
sorttable.h script/sorttable: Fix some initialization problems 2022-01-18 10:17:18 -05:00
spdxcheck-test.sh docs: move Linux logo into a new images folder 2022-06-01 09:32:45 -06:00
spdxcheck.py scripts/spdxcheck: Put excluded files and directories into a separate file 2022-05-18 15:34:33 +02:00
spdxexclude scripts/spdxcheck: Exclude top-level README 2022-05-18 15:35:42 +02:00
spelling.txt scripts/spelling.txt: add more spellings to spelling.txt 2022-03-22 15:57:00 -07:00
sphinx-pre-install scripts: sphinx-pre-install: place a warning for Sphinx >= 3.0 2022-07-07 12:47:34 -06:00
split-man.pl tweewide: Fix most Shebang lines 2020-12-08 23:30:04 +09:00
stackdelta
stackusage
subarch.include LoongArch: Add build infrastructure 2022-06-03 20:09:27 +08:00
syscallhdr.sh scripts: check duplicated syscall number in syscall table 2021-07-09 04:00:39 +09:00
syscallnr.sh scripts: make some scripts executable 2021-08-10 09:13:25 +09:00
syscalltbl.sh scripts: check duplicated syscall number in syscall table 2021-07-09 04:00:39 +09:00
tags.sh scripts/tags.sh: Include tools directory in tags generation 2022-07-01 10:32:30 +02:00
test_fortify.sh fortify: Update compile-time tests for Clang 14 2022-02-13 16:50:06 -08:00
tools-support-relr.sh Makefile: fix GDB warning with CONFIG_RELR 2021-06-08 13:09:34 +01:00
unifdef.c
ver_linux Removed the oprofiled version option 2021-05-03 17:23:06 -06:00
xen-hypercalls.sh scripts: make some scripts executable 2021-08-10 09:13:25 +09:00
xz_wrap.sh kbuild: add variables for compression tools 2020-06-06 23:42:01 +09:00