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097469a2b0
The Amlogic DDR PMU driver meson_ddr_pmu_create() function incorrectly uses
smp_processor_id(), which assumes disabled preemption. This leads to kernel
warnings during module loading because meson_ddr_pmu_create() can be called
in a preemptible context.
Following kernel warning and stack trace:
[ 31.745138] [ T2289] BUG: using smp_processor_id() in preemptible [00000000] code: (udev-worker)/2289
[ 31.745154] [ T2289] caller is debug_smp_processor_id+0x28/0x38
[ 31.745172] [ T2289] CPU: 4 UID: 0 PID: 2289 Comm: (udev-worker) Tainted: GW 6.14.0-0-MANJARO-ARM #1 59519addcbca6ba8de735e151fd7b9e97aac7ff0
[ 31.745181] [ T2289] Tainted: [W]=WARN
[ 31.745183] [ T2289] Hardware name: Hardkernel ODROID-N2Plus (DT)
[ 31.745188] [ T2289] Call trace:
[ 31.745191] [ T2289] show_stack+0x28/0x40 (C)
[ 31.745199] [ T2289] dump_stack_lvl+0x4c/0x198
[ 31.745205] [ T2289] dump_stack+0x20/0x50
[ 31.745209] [ T2289] check_preemption_disabled+0xec/0xf0
[ 31.745213] [ T2289] debug_smp_processor_id+0x28/0x38
[ 31.745216] [ T2289] meson_ddr_pmu_create+0x200/0x560 [meson_ddr_pmu_g12 8095101c49676ad138d9961e3eddaee10acca7bd]
[ 31.745237] [ T2289] g12_ddr_pmu_probe+0x20/0x38 [meson_ddr_pmu_g12 8095101c49676ad138d9961e3eddaee10acca7bd]
[ 31.745246] [ T2289] platform_probe+0x98/0xe0
[ 31.745254] [ T2289] really_probe+0x144/0x3f8
[ 31.745258] [ T2289] __driver_probe_device+0xb8/0x180
[ 31.745261] [ T2289] driver_probe_device+0x54/0x268
[ 31.745264] [ T2289] __driver_attach+0x11c/0x288
[ 31.745267] [ T2289] bus_for_each_dev+0xfc/0x160
[ 31.745274] [ T2289] driver_attach+0x34/0x50
[ 31.745277] [ T2289] bus_add_driver+0x160/0x2b0
[ 31.745281] [ T2289] driver_register+0x78/0x120
[ 31.745285] [ T2289] __platform_driver_register+0x30/0x48
[ 31.745288] [ T2289] init_module+0x30/0xfe0 [meson_ddr_pmu_g12 8095101c49676ad138d9961e3eddaee10acca7bd]
[ 31.745298] [ T2289] do_one_initcall+0x11c/0x438
[ 31.745303] [ T2289] do_init_module+0x68/0x228
[ 31.745311] [ T2289] load_module+0x118c/0x13a8
[ 31.745315] [ T2289] __arm64_sys_finit_module+0x274/0x390
[ 31.745320] [ T2289] invoke_syscall+0x74/0x108
[ 31.745326] [ T2289] el0_svc_common+0x90/0xf8
[ 31.745330] [ T2289] do_el0_svc+0x2c/0x48
[ 31.745333] [ T2289] el0_svc+0x60/0x150
[ 31.745337] [ T2289] el0t_64_sync_handler+0x80/0x118
[ 31.745341] [ T2289] el0t_64_sync+0x1b8/0x1c0
Changes replaces smp_processor_id() with raw_smp_processor_id() to
ensure safe CPU ID retrieval in preemptible contexts.
Cc: Jiucheng Xu <jiucheng.xu@amlogic.com>
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.