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Xiu Jianfeng 47179fe035 mm/hugetlb_cgroup: prepare cftypes based on template 
Unlike other cgroup subsystems, the hugetlb cgroup does not provide a
static array of cftype that explicitly displays the properties, handling
functions, etc., of each file.  Instead, it dynamically creates the
attribute of cftypes based on the hstate during the startup procedure. 
This reduces the readability of the code.

To fix this issue, introduce two templates of cftypes, and rebuild the
attributes according to the hstate to make it ready to be added to cgroup
framework.

Link: https://lkml.kernel.org/r/20240612092409.2027592-3-xiujianfeng@huawei.com
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: kernel test robot <oliver.sang@intel.com>
From: Xiu Jianfeng <xiujianfeng@huawei.com>
Subject: mm/hugetlb_cgroup: register lockdep key for cftype
Date: Tue, 18 Jun 2024 07:19:22 +0000

When CONFIG_DEBUG_LOCK_ALLOC is enabled, the following commands can
trigger a bug,

mount -t cgroup2 none /sys/fs/cgroup
cd /sys/fs/cgroup
echo "+hugetlb" > cgroup.subtree_control

The log is as below:

BUG: key ffff8880046d88d8 has not been registered!
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 3 PID: 226 at kernel/locking/lockdep.c:4945 lockdep_init_map_type+0x185/0x220
Modules linked in:
CPU: 3 PID: 226 Comm: bash Not tainted 6.10.0-rc4-next-20240617-g76db4c64526c #544
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:lockdep_init_map_type+0x185/0x220
Code: 00 85 c0 0f 84 6c ff ff ff 8b 3d 6a d1 85 01 85 ff 0f 85 5e ff ff ff 48 c7 c6 21 99 4a 82 48 c7 c7 60 29 49 82 e8 3b 2e f5
RSP: 0018:ffffc9000083fc30 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffffffff828dd820 RCX: 0000000000000027
RDX: ffff88803cd9cac8 RSI: 0000000000000001 RDI: ffff88803cd9cac0
RBP: ffff88800674fbb0 R08: ffffffff828ce248 R09: 00000000ffffefff
R10: ffffffff8285e260 R11: ffffffff828b8eb8 R12: ffff8880046d88d8
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880067281c0
FS:  00007f68601ea740(0000) GS:ffff88803cd80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005614f3ebc740 CR3: 000000000773a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ? __warn+0x77/0xd0
 ? lockdep_init_map_type+0x185/0x220
 ? report_bug+0x189/0x1a0
 ? handle_bug+0x3c/0x70
 ? exc_invalid_op+0x18/0x70
 ? asm_exc_invalid_op+0x1a/0x20
 ? lockdep_init_map_type+0x185/0x220
 __kernfs_create_file+0x79/0x100
 cgroup_addrm_files+0x163/0x380
 ? find_held_lock+0x2b/0x80
 ? find_held_lock+0x2b/0x80
 ? find_held_lock+0x2b/0x80
 css_populate_dir+0x73/0x180
 cgroup_apply_control_enable+0x12f/0x3a0
 cgroup_subtree_control_write+0x30b/0x440
 kernfs_fop_write_iter+0x13a/0x1f0
 vfs_write+0x341/0x450
 ksys_write+0x64/0xe0
 do_syscall_64+0x4b/0x110
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f68602d9833
Code: 8b 15 61 26 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 08
RSP: 002b:00007fff9bbdf8e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007f68602d9833
RDX: 0000000000000009 RSI: 00005614f3ebc740 RDI: 0000000000000001
RBP: 00005614f3ebc740 R08: 000000000000000a R09: 0000000000000008
R10: 00005614f3db6ba0 R11: 0000000000000246 R12: 0000000000000009
R13: 00007f68603bd6a0 R14: 0000000000000009 R15: 00007f68603b8880

For lockdep, there is a sanity check in lockdep_init_map_type(), the
lock-class key must either have been allocated statically or must
have been registered as a dynamic key. However the commit e18df2889f
("mm/hugetlb_cgroup: prepare cftypes based on template") has changed
the cftypes from static allocated objects to dynamic allocated objects,
so the cft->lockdep_key must be registered proactively.

[xiujianfeng@huawei.com: fix BUG()]
  Link: https://lkml.kernel.org/r/20240619015527.2212698-1-xiujianfeng@huawei.com
Link: https://lkml.kernel.org/r/20240618071922.2127289-1-xiujianfeng@huawei.com
Link: https://lore.kernel.org/all/602186b3-5ce3-41b3-90a3-134792cc2a48@samsung.com/
Fixes: e18df2889f ("mm/hugetlb_cgroup: prepare cftypes based on template")
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202406181046.8d8b2492-oliver.sang@intel.com
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: SeongJae Park <sj@kernel.org>
Closes: https://lore.kernel.org/20240618233608.400367-1-sj@kernel.org
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-07-03 19:30:10 -07:00
arch arch/x86: do not explicitly clear Reserved flag in free_pagetable 2024-07-03 19:30:02 -07:00
block block: unmap and free user mapped integrity via submitter 2024-06-12 11:00:50 -06:00
certs kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
crypto This push fixes a bug in the new ecc P521 code as well as a buggy 2024-05-20 08:47:54 -07:00
Documentation Documentation/admin-guide/mm/pagemap.rst: drop "Using pagemap to do something useful" 2024-07-03 19:30:06 -07:00
drivers ata fixes for 6.10-rc6 2024-06-30 14:32:24 -07:00
fs fs/proc: move page_mapcount() to fs/proc/internal.h 2024-07-03 19:30:06 -07:00
include mm/hugetlb_cgroup: prepare cftypes based on template 2024-07-03 19:30:10 -07:00
init gcc: disable '-Warray-bounds' for gcc-9 2024-06-15 10:43:04 -07:00
io_uring io_uring: signal SQPOLL task_work with TWA_SIGNAL_NO_IPI 2024-06-24 19:46:15 -06:00
ipc Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
kernel mm: remove the implementation of swap_free() and always use swap_free_nr() 2024-07-03 19:30:01 -07:00
lib lib: test_hmm: add missing MODULE_DESCRIPTION() macro 2024-07-03 19:30:05 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/hugetlb_cgroup: prepare cftypes based on template 2024-07-03 19:30:10 -07:00
net NFS client bugfixes for Linux 6.10 2024-06-29 13:48:24 -07:00
rust rust: avoid unused import warning in rusttest 2024-06-11 23:33:28 +02:00
samples kmemleak-test: add missing MODULE_DESCRIPTION() macro 2024-07-03 19:30:04 -07:00
scripts kbuild: scripts/gdb: bring the "abspath" back 2024-06-27 04:20:32 +09:00
security lsm/stable-6.10 PR 20240617 2024-06-17 18:35:12 -07:00
sound ASoC: Fixes for v6.10 2024-06-26 22:02:55 +02:00
tools selftests/mm: guard defines from shm 2024-07-03 19:30:09 -07:00
usr kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
virt KVM fixes for 6.10 2024-06-21 08:03:55 -04:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap bpf-for-netdev 2024-06-14 17:57:10 -07:00
.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 MAINTAINERS: Drop Gustavo Pimentel as PCI DWC Maintainer 2024-03-27 13:41:02 -05:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS IOMMU Fixes for Linux v6.10-rc5 2024-06-28 09:18:01 -07:00
Makefile Linux 6.10-rc6 2024-06-30 14:40:44 -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.