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Chen Zhongjin d51c508142 locking/csd_lock: Change csdlock_debug from early_param to __setup 
[ Upstream commit 9c9b26b0df ]

The csdlock_debug kernel-boot parameter is parsed by the
early_param() function csdlock_debug().  If set, csdlock_debug()
invokes static_branch_enable() to enable csd_lock_wait feature, which
triggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and
CONFIG_SPARSEMEM_VMEMMAP=n.

With CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in
static_key_enable() and returns NULL, resulting in a NULL dereference
because mem_section is initialized only later in sparse_init().

This is also a problem for powerpc because early_param() functions
are invoked earlier than jump_label_init(), also resulting in
static_key_enable() failures.  These failures cause the warning "static
key 'xxx' used before call to jump_label_init()".

Thus, early_param is too early for csd_lock_wait to run
static_branch_enable(), so changes it to __setup to fix these.

Fixes: 8d0968cc6b ("locking/csd_lock: Add boot parameter for controlling CSD lock debugging")
Cc: stable@vger.kernel.org
Reported-by: Chen jingwen <chenjingwen6@huawei.com>
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-04-19 17:52:53 +08:00
arch ARM: remove some dead code 2023-04-19 17:52:53 +08:00
block block: ensure iov_iter advances for added pages 2023-04-19 17:52:40 +08:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2023-04-19 17:50:34 +08:00
crypto crypto: blake2s - remove shash module 2023-04-19 17:52:51 +08:00
Documentation serial: 8250: Add proper clock handling for OxSemi PCIe devices 2023-04-19 17:52:53 +08:00
drivers dm thin: fix use-after-free crash in dm_sm_register_threshold_callback 2023-04-19 17:52:53 +08:00
fs __follow_mount_rcu(): verify that mount_lock remains unchanged 2023-04-19 17:52:50 +08:00
include spmi: trace: fix stack-out-of-bound access in SPMI tracing functions 2023-04-19 17:52:50 +08:00
init stack: Declare {randomize_,}kstack_offset to fix Sparse warnings 2023-04-19 17:52:12 +08:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2023-04-19 17:49:52 +08:00
kernel locking/csd_lock: Change csdlock_debug from early_param to __setup 2023-04-19 17:52:53 +08:00
lib lib/smp_processor_id: fix imbalanced instrumentation_end() call 2023-04-19 17:52:44 +08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/mmap.c: fix missing call to vm_unacct_memory in mmap_region 2023-04-19 17:52:39 +08:00
net net/9p: Initialize the iounit field during fid creation 2023-04-19 17:52:53 +08:00
samples samples/landlock: Format with clang-format 2023-04-19 17:50:01 +08:00
scripts scripts/faddr2line: Fix vmlinux detection on arm64 2023-04-19 17:52:48 +08:00
security selinux: Add boundary check in put_entry() 2023-04-19 17:52:09 +08:00
sound ASoC: mchp-spdifrx: disable end of block interrupt on failures 2023-04-19 17:52:46 +08:00
tools tools/thermal: Fix possible path truncations 2023-04-19 17:52:48 +08:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2023-04-19 17:44:58 +08:00
virt KVM: Don't set Accessed/Dirty bits for ZERO_PAGE 2023-04-19 17:52:31 +08:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Input: goodix - add a goodix.h header file 2023-04-19 17:50:59 +08:00
Makefile Makefile: link with -z noexecstack --no-warn-rwx-segments 2023-04-19 17:51:58 +08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 Restructured Text 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.