a0572f687f
The function ftrace_replace_code() is the ftrace engine that does the work to modify all the nops into the calls to the function callback in all the functions being traced. The generic version which is normally called from stop machine, but an architecture can implement a non stop machine version and still use the generic ftrace_replace_code(). When an architecture does this, ftrace_replace_code() may be called from a schedulable context, where it can allow the code to be preemptible, and schedule out. In order to allow an architecture to make ftrace_replace_code() schedulable, a new command flag is added called: FTRACE_MAY_SLEEP Which can be or'd to the command that is passed to ftrace_modify_all_code() that calls ftrace_replace_code() and will have it call cond_resched() in the loop that modifies the nops into the calls to the ftrace trampolines. Link: http://lkml.kernel.org/r/20181204192903.8193-1-anders.roxell@linaro.org Link: http://lkml.kernel.org/r/20181205183303.828422192@goodmis.org Reported-by: Anders Roxell <anders.roxell@linaro.org> Tested-by: Anders Roxell <anders.roxell@linaro.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> |
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| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| 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 | ||
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.