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log2 as currently implemented applies only to u64 trace_event_field derived fields, and assumes that anything it's applied to is a u64 field. To prepare for synthetic fields like latencies, log2 should be applicable to those as well, so take the opportunity now to fix the current problems as well as expand to more general uses. log2 should be thought of as a chaining function rather than a field type. To enable this as well as possible future function implementations, add a hist_field operand array into the hist_field definition for this purpose, and make use of it to implement the log2 'function'. Link: http://lkml.kernel.org/r/b47f93fc0b87b36eccf716b0c018f3a71e1f1111.1506105045.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.