On Tue, 23 Jul 2013, Fabio Estevam wrote: > From: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> > > Commit 93dc688 (ARM: 7684/1: errata: Workaround for Cortex-A15 erratum 798181 > (TLBI/DSB operations)) causes the following undefined instruction error on a > mx53 (Cortex-A8): > > Internal error: Oops - undefined instruction: 0 [#1] SMP ARM > CPU: 0 PID: 275 Comm: modprobe Not tainted 3.11.0-rc2-next-20130722-00009-g9b0f371 #881 > task: df46cc00 ti: df48e000 task.ti: df48e000 > PC is at check_and_switch_context+0x17c/0x4d0 > LR is at check_and_switch_context+0xdc/0x4d0 > > This problem happens because check_and_switch_context() calls > dummy_flush_tlb_a15_erratum() without checking if we are really running on a > Cortex-A15 or not. > > To avoid this issue, always check if we are running on a Cortex-A15 or not > (via erratum_a15_798181()) inside dummy_flush_tlb_a15_erratum(), so that we do > not need to keep doing the same check in all occurrences of > dummy_flush_tlb_a15_erratum(). > > Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> Nice work. This fixes the v3.11-rc boot regression on most OMAP3/AM33xx devices. Tested-by: Paul Walmsley <paul@xxxxxxxxx> # for OMAP2,3,4,AM33xx - Paul -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
