mainlining shenanigans
cd539cff94
When CONFIG_LOCKDEP is not set, lock_is_held() and lockdep_is_held() are not declared or defined. This forces all callers to use #ifdefs around these checks. Recent RCU changes added a lot of lockdep_is_held() calls inside rcu_dereference_protected(). This macro hides its argument on !LOCKDEP builds, which can lead to false-positive unused-variable warnings. This commit therefore provides forward declarations of lock_is_held() and lockdep_is_held() but without defining them. This way callers (including those internal to RCU) can keep them visible to the compiler on !LOCKDEP builds and instead depend on dead code elimination to remove the references, which in turn prevents the linker from complaining about the lack of the corresponding function definitions. [ paulmck: Apply Peter Zijlstra feedback on "extern". ] Signed-off-by: Jakub Kicinski <kuba@kernel.org> -- CC: peterz@infradead.org CC: mingo@redhat.com CC: will@kernel.org Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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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.