From: Henrik Austad Date: Tue, 26 Mar 2013 07:16:42 +0000 (+0100) Subject: tile: ns2cycles should use __raw_get_cpu_var X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~79^2~2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=39e8202bb3b83a826e5825b1a07bbbf30ae9a140;p=pandora-kernel.git tile: ns2cycles should use __raw_get_cpu_var ns2cycles use per_cpu variables, and will, eventually, find its way into smp_processor_id(). This is not safe in a preemptible kernel; preemption should ideally be disabled. BUG: using smp_processor_id() in preemptible [00000000] code: systemd-modules/367 caller is ns2cycles+0x40/0xb8 Starting stack dump of tid 367, pid 367 (systemd-modules) on cpu 2 at cycle 20969956421 frame 0: 0xfffffff70004b860 dump_stack+0x0/0x20 (sp 0xfffffe407993fa90) frame 1: 0xfffffff7006abc28 debug_smp_processor_id+0x1a8/0x1e0 (sp 0xfffffe407993fa90) frame 2: 0xfffffff7004d7b40 ns2cycles+0x40/0xb8 (sp 0xfffffe407993fab8) frame 3: 0xfffffff7004dc578 __ndelay+0x38/0x80 (sp 0xfffffe407993fae0) However, in this case: - the frequency is the same accross all cores - we use the data read-only - we do not scale the frequency Which means that we can use the __raw_get_cpu_var instead. Signed-off-by: Henrik Austad Signed-off-by: Chris Metcalf --- Reading git-diff-tree failed