mainlining shenanigans
c518cfa0c5
The places which need to prevent the execution of trace type BPF programs to prevent deadlocks on the hash bucket lock do this open coded. Provide two inline functions, bpf_disable/enable_instrumentation() to replace these open coded protection constructs. Use migrate_disable/enable() instead of preempt_disable/enable() right away so this works on RT enabled kernels. On a !RT kernel migrate_disable / enable() are mapped to preempt_disable/enable(). These helpers use this_cpu_inc/dec() instead of __this_cpu_inc/dec() on an RT enabled kernel because migrate disabled regions are preemptible and preemption might hit in the middle of a RMW operation which can lead to inconsistent state. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200224145644.103910133@linutronix.de |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| 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 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.