From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Wed, 22 Jul 2009 03:23:41 +0000 (+0800)
Subject: tracing/ksym_tracer: fix write operation of ksym_trace_filter
X-Git-Tag: v2.6.33-rc1~399^2~146^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8e068542a8d9efec55126284d2f5cb32f003d507;p=pandora-kernel.git

tracing/ksym_tracer: fix write operation of ksym_trace_filter

This patch fix 2 bugs:
- fix the return value of ksym_trace_filter_write() when we want to
  clear symbol in ksym_trace_filter file
  for example:
  # echo global_trace:rw- > /debug/tracing/ksym_trace_filter
  # echo global_trace:--- > /debug/tracing/ksym_trace_filter
  -bash: echo: write error: Invalid argument
  # cat /debug/tracing/ksym_trace_filter
  #
  We want to clear 'global_trace' in ksym_trace_filter, it complain
  with "Invalid argument", but the operation is successful

- the "r--" access types is not allowed, but ksym_trace_filter file think
  it OK
  for example:
  # echo ksym_tracer_mutex:r-- > ksym_trace_filter
  -bash: echo: write error: Resource temporarily unavailable
  # dmesg
  ksym_tracer request failed. Try again later!!

  The error occur at register_kernel_hw_breakpoint(), but It's should
  at access types parser

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
LKML-Reference: <4A66863D.5090802@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---

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