tree 1142caae30cc45fec1a7af3065b916349a285f5e
parent efcc7ef78aa741a8594ccee86e5cd8055c1eef37
author Luis R. Rodriguez <mcgrof@kernel.org> 1455859857 -0800
committer Luis R. Rodriguez <mcgrof@kernel.org> 1469926943 -0700

kprobes: port .kprobes.text to section range

kprobe makes use of two custom sections, each custom section
is folded into one of the standard Linux sections types as follows,
it currently relies on the linker script to fold the custom section
onto the respective Linux section:

type  Linux-section custom section name  begin                    end
table .init.data    _kprobe_blacklist    __start_kprobe_blacklist __stop_kprobe_blacklist
range .text         .kprobes.text        __kprobes_text_start     __kprobes_text_end

This ports the .kprobes.text custom section to the standard
Linux ranges API allowing us remove all the custom kprobe section
declarations from the linker script.

Tested with CONFIG_KPROBES_SANITY_TEST, it passes with:

Kprobe smoke test: started
Kprobe smoke test: passed successfully

Then tested CONFIG_SAMPLE_KPROBES on do_fork, and the kprobe bites
and kicks as expected.

Also ran ./ftracetest with no issues:

$ sudo ./ftracetest
=== Ftrace unit tests ===
[1] Basic trace file check      [PASS]
[2] Basic test for tracers      [PASS]
[3] Basic trace clock test      [PASS]
[4] Basic event tracing check   [PASS]
[5] event tracing - enable/disable with event level files       [PASS]
[6] event tracing - restricts events based on pid       [PASS]
[7] event tracing - enable/disable with subsystem level files   [PASS]
[8] event tracing - enable/disable with top level files [PASS]
[9] ftrace - function graph filters with stack tracer   [PASS]
[10] ftrace - function graph filters    [PASS]
[11] ftrace - function profiler with function tracing   [PASS]
[12] Test creation and deletion of trace instances while setting an event[PASS]
[13] Test creation and deletion of trace instances      [PASS]
[14] Kprobe dynamic event - adding and removing [PASS]
[15] Kprobe dynamic event - busy event check    [PASS]
[16] Kprobe dynamic event with arguments        [PASS]
[17] Kprobe dynamic event with function tracer  [PASS]
[18] Kretprobe dynamic event with arguments     [PASS]
[19] event trigger - test event enable/disable trigger  [PASS]
[20] event trigger - test trigger filter        [PASS]
[21] event trigger - test histogram modifiers   [PASS]
[22] event trigger - test histogram trigger     [PASS]
[23] event trigger - test multiple histogram triggers   [PASS]
[24] event trigger - test snapshot-trigger      [PASS]
[25] event trigger - test stacktrace-trigger    [PASS]
[26] event trigger - test traceon/off trigger   [PASS]

 # of passed:  26
 # of failed:  0
 # of unresolved:  0
 # of untested:  0
 # of unsupported:  0
 # of xfailed:  0
 # of undefined(test bug):  0

v4:

o open-code section use on scripts/ code -- folks to prefer the
  simplicity over dealing with having more tool code access kernel
  headers.

o NOPE: include #include <asm-generic/ranges.h> on compiler.h -- solves
  a few 0-day compilation issues

v3:

o after v2 arch/arm/kernel/vmlinux-xip.lds.S got kprobe support,
  this just removes the custom linker script reference to kprobes as
  that is no longer needed with linker tables.

o split kprobe linker table and kprobe section ranges use into
  two separate patches. This should make it easier to review and
  also demos both distinct use types, one a linker table another
  a simple section range.

v2: introduced this patch in this series

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>