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This provides compatible testing of SCX_ENQ_CPU_SELECTED.
More specifically, it handles two cases:
1. a BPF scheduler is compiled against vmlinux.h where
SCX_ENQ_CPU_SELECTED is defined, but it runs on a kernel that does not
have SCX_ENQ_CPU_SELECTED. In this case, the test result of
'enq_flags & SCX_ENQ_CPU_SELECTED' will always be false. That test result
is semantically incorrect because the kernel before SCX_ENQ_CPU_SELECTED
has never skipped select_task_rq_scx(), so the result should be true.
2. a BPF scheduler is compiling against vmlinux.h where
SCX_ENQ_CPU_SELECTED is not defined. In this case, directly using
SCX_ENQ_CPU_SELECTED causes compilation errors.
To hide such complexity, introduce __COMPAT_is_enq_cpu_selected(),
which checks if SCX_ENQ_CPU_SELECTED exists in runtime using BPF CO-RE.
This consists of three parts:
1. Add enum_defs.autogen.h, which has macros (HAVE_{enum name}) denoting
whether SCX enums are defined in the vmlinux.h or not.
2. Implement __COMPAT_is_enq_cpu_selected(), which provide the test of
SCX_ENQ_CPU_SELECTED in a compatible way.
3. Use __COMPAT_is_enq_cpu_selected() in scx_qmap.
Note that this is a sync of the relevant PR [1] in the scx repo.
[1] https://github.com/sched-ext/scx/pull/1314
Signed-off-by: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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| 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.