From: Markus Metzger Date: Fri, 3 Apr 2009 14:43:37 +0000 (+0200) Subject: x86, bts: fix race between per-task and per-cpu branch tracing X-Git-Tag: v2.6.31-rc1~401^2~62^2~22 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=38f801129ad07b9afa7f9bd3779f61b805416d8c;p=pandora-kernel.git x86, bts: fix race between per-task and per-cpu branch tracing Per-task branch tracing installs a debug store context with the traced task. This immediately results in the branch trace control bits to be cleared for the next context switch of that task, if not set before. Either per-cpu or per-task tracing are allowed at the same time. An active per-cpu tracing would be disabled even if the per-task tracing request is rejected and the task debug store context removed. Check the tracing type (per-cpu or per-task) before installing a task debug store context. Signed-off-by: Markus Metzger Cc: roland@redhat.com Cc: eranian@googlemail.com Cc: oleg@redhat.com Cc: juan.villacis@intel.com Cc: ak@linux.jf.intel.com LKML-Reference: <20090403144552.856000000@intel.com> Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed