From: Frederic Weisbecker <fweisbec@xxxxxxxxx> Date: Thu, 18 Mar 2010 05:49:33 +0100 > While using the lock events through perf in a sparc box, I can see > the following message repeated many times: > > Kernel unaligned access at TPC[49357c] perf_trace_lock_acquire+0xb4/0x180 > > It actually hangs the box as the messages are sent to a serial console. > > When used with perf, the trace events use a per cpu buffer allocated > in kernel/trace/trace_event_perf.c, and the allocation appears to return > a misaligned percpu pointer. It is aligned to 4 while it seems it > requires to be aligned to 8. Thanks I'll take a look at this. RAW locks (both rwlocks and spinlocks) on sparc64 are 4-bytes in size, maybe some piece of code is assuming that locks are cpu word sized. Where is perf_trace_lock_acquire() I can't find it in Linus's tree? Does it get created by some crazy macro expansion? -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
