From: Peter Zijlstra Date: Fri, 20 Nov 2009 21:19:48 +0000 (+0100) Subject: perf: Optimize perf_event_mmap_ctx() X-Git-Tag: v2.6.33-rc1~399^2~134 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6d9dd237da400effb265f3554c64413f8a3e7b4;p=pandora-kernel.git perf: Optimize perf_event_mmap_ctx() Remove a rcu_read_{,un}lock() pair and a few conditionals. We can remove the rcu_read_lock() by increasing the scope of one in the calling function. We can do away with the system_state check if the machine still boots after this patch (seems to be the case). We can do away with the list_empty() check because the bare list_for_each_entry_rcu() reduces to that now that we've removed everything else. Signed-off-by: Peter Zijlstra Cc: Paul Mackerras LKML-Reference: <20091120212508.606459548@chello.nl> Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed