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7f16357378
Relocate the printk() calls from spectre_v4_mitigations_off() and spectre_v2_mitigations_off() into setup_system_capabilities() function, preventing hard lockups caused by printk calls in scheduler context: | _raw_spin_lock_nested+168 | ttwu_queue+180 （rq_lock(rq, &rf); 2nd acquiring the rq->__lock） | try_to_wake_up+548 | wake_up_process+32 | __up+88 | up+100 | __up_console_sem+96 | console_unlock+696 | vprintk_emit+428 | vprintk_default+64 | vprintk_func+220 | printk+104 | spectre_v4_enable_task_mitigation+344 | __switch_to+100 | __schedule+1028 (rq_lock(rq, &rf); 1st acquiring the rq->__lock) | schedule_idle+48 | do_idle+388 | cpu_startup_entry+44 | secondary_start_kernel+352 Suggested-by: Mark Rutland <mark.rutland@arm.com> Suggested-by: Catalin Marinas <catalin.marinas@arm.com> Suggested-by: Will Deacon <will@kernel.org> Signed-off-by: shechenglong <shechenglong@xfusion.com> Signed-off-by: Will Deacon <will@kernel.org>
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.