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David Sterba b37eb352c4 btrfs: accessors: delete token versions of set/get helpers 
Once upon a time there was a need to cache address of extent buffer
pages, as it was a costly operation (map_private_extent_buffer(),
cfed81a04e ("Btrfs: add the ability to cache a pointer into the
eb")).  This was not even due to use of HIGHMEM, this had been removed
before that due to possible locking issues (a65917156e ("Btrfs:
stop using highmem for extent_buffers")).

Over time the amount of work in the set/get helpers got reduced and
became quite straightforward bounds checking with an unaligned
read/write, commit db3756c879 ("btrfs: remove unused
map_private_extent_buffer").

The actual caching of the page_address()/folio_address() in the token
was more work for very little gain. This depended on subsequent access
into the same page/folio, otherwise the cached pointer had to be
updated.

For metadata-heavy operations this showed up in the 'perf top' profile
where the btrfs_get_token_32() calls were at the top, on my testing
machine consuming about 2-3%. The other generic 32/64 bit helpers also
appeared in the profile with similar fraction.

After removing use of the token helpers we can remove them completely,
this leads to reduction of btrfs.ko by 6.7KiB on release config.

   text    data     bss     dec     hex filename
1463289  115665   16088 1595042  1856a2 pre/btrfs.ko
1456601  115665   16088 1588354  183c82 post/btrfs.ko

DELTA: -6688

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2025-07-22 00:05:00 +02:00
arch A single fix for a GCC wreckage, which emits a KCSAN instrumentation call 2025-07-20 11:27:52 -07:00
block block-6.16-20250718 2025-07-18 12:16:13 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: wp512 - Use API partial block handling 2025-06-23 16:56:56 +08:00
Documentation Char/Misc/IIO fixes for 6.16-rc7 2025-07-20 09:03:41 -07:00
drivers i2c-for-6.16-rc7 2025-07-20 12:56:13 -07:00
fs btrfs: accessors: delete token versions of set/get helpers 2025-07-22 00:05:00 +02:00
include btrfs: tree-log: add and rename extent bits for dirty_log_pages tree 2025-07-21 23:58:01 +02:00
init futex: Temporary disable FUTEX_PRIVATE_HASH 2025-07-01 15:02:05 +02:00
io_uring io_uring-6.16-20250718 2025-07-18 12:21:26 -07:00
ipc - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
kernel Tracing fixes for 6.16: 2025-07-20 13:03:31 -07:00
lib maple_tree: fix mt_destroy_walk() on root leaf node 2025-07-09 21:07:52 -07:00
LICENSES LICENSES: add CC0-1.0 license text 2025-05-21 14:54:17 +02:00
mm vfs-6.16-rc7.fixes 2025-07-19 08:47:59 -07:00
net bluetooth pull request for net: 2025-07-17 07:54:49 -07:00
rust Rust fixes for v6.16 (2nd) 2025-07-19 09:22:26 -07:00
samples samples/damon: fix damon sample mtier for start failure 2025-07-09 21:07:55 -07:00
scripts Rust fixes for v6.16 (2nd) 2025-07-19 09:22:26 -07:00
security selinux: change security_compute_sid to return the ssid or tsid on match 2025-06-19 16:13:16 -04:00
sound ASoC: Fixes for v6.16 2025-07-17 14:53:38 +02:00
tools A single fix for the futex selftest code to make 32-bit user space work 2025-07-20 11:22:05 -07:00
usr usr/include: openrisc: don't HDRTEST bpf_perf_event.h 2025-05-12 15:03:17 +09:00
virt KVM: Allow CPU to reschedule while setting per-page memory attributes 2025-06-24 12:20:17 -07:00
.clang-format Linux 6.15-rc5 2025-05-06 16:39:25 +10:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore Python compiled bytecode 2025-04-24 10:12:46 -06:00
.mailmap MAINTAINERS: Update Kirill Shutemov's email address for TDX 2025-07-11 07:25:51 -07:00
.pylintrc docs: add a .pylintrc file with sys path for docs scripts 2025-04-09 12:10:33 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS CREDITS: Add entry for Shannon Nelson 2025-06-21 07:34:28 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS Char/Misc/IIO fixes for 6.16-rc7 2025-07-20 09:03:41 -07:00
Makefile Linux 6.16-rc7 2025-07-20 15:18:33 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.