Tommi Rantala d2e7d8636f perf cgroup: Avoid needless closing of unopened fd
Do not bother with close() if fd is not valid, just to silence valgrind:

    $ valgrind ./perf script
    ==59169== Memcheck, a memory error detector
    ==59169== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
    ==59169== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
    ==59169== Command: ./perf script
    ==59169==
    ==59169== Warning: invalid file descriptor -1 in syscall close()
    ==59169== Warning: invalid file descriptor -1 in syscall close()
    ==59169== Warning: invalid file descriptor -1 in syscall close()
    ==59169== Warning: invalid file descriptor -1 in syscall close()
    ==59169== Warning: invalid file descriptor -1 in syscall close()
    ==59169== Warning: invalid file descriptor -1 in syscall close()
    ==59169== Warning: invalid file descriptor -1 in syscall close()
    ==59169== Warning: invalid file descriptor -1 in syscall close()

Signed-off-by: Tommi Rantala <tommi.t.rantala@nokia.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.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/20200417132330.119407-1-tommi.t.rantala@nokia.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2020-04-22 10:01:33 -03:00
2020-02-24 22:43:18 -08:00
2020-04-19 14:35:30 -07:00

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.
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