a827c007c7
If there is no configuration file at first, the user can write any pair of "key.subkey=value" to the newly created configuration file, while value validation against a valid configurable key is *deferred* until the next execution or the implied execution of "perf config ... ". For example: $ rm ~/.perfconfig $ perf config call-graph.dump-size=65529 $ cat ~/.perfconfig # this file is auto-generated. [call-graph] dump-size = 65529 $ perf config call-graph.dump-size=2048 callchain: Incorrect stack dump size (max 65528): 65529 Error: wrong config key-value pair call-graph.dump-size=65529 The user might expect that the second value 2048 is valid and can be updated to the configuration file, but the error message is very confusing because the first value 65529 is not reported as an error during the last configuration. It is recommended not to change the current behavior of delayed validation (as more effort is needed), but to refine the original error message to *clearly indicate* that the cause of the error is the configuration file. Signed-off-by: Like Xu <likexu@tencent.com> Acked-by: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20210924115817.58689-1-likexu@tencent.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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.