From: Oleg Nesterov <oleg@redhat.com>
Date: Sat, 13 Apr 2013 13:36:49 +0000 (+0200)
Subject: uprobes/perf: Avoid perf_trace_buf_prepare/submit if ->perf_events is empty
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~119^2~9^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=515619f209114697fabd21eed1623bfa69746815;p=pandora-kernel.git

uprobes/perf: Avoid perf_trace_buf_prepare/submit if ->perf_events is empty

perf_trace_buf_prepare() + perf_trace_buf_submit() make no sense
if this task/CPU has no active counters. Change uprobe_perf_print()
to return if hlist_empty(call->perf_events).

Note: this is not uprobe-specific, we can change other users too.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
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