> Atomic operations are undefined behavior on ARM for device or strongly > ordered memory types. So use write-combine variants for mappings. This > corresponds to normal, non-cacheable memory on ARM. For many other > architectures, this change should not change the mapping type.
Hi, all I have met this problems on tegra soc. I tried to use pstore-ram, but the system will hang up when run the atomic_cmpxchg() in the buffer_start_add() or buffer_size_add(), whatever I use iomapped or vmapped regions. I tried to apply this patch set, it was failed with vmap, but if use iomapped rgiions, the ldrex/strex can work on this memory, and the ramoops driver can work. Does there have any updates for this issue? Or how can I debug it? Thanks. Wei. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
