On Wed, 13 May 2015, Toshi Kani wrote: > __ioremap_caller() calls reserve_memtype() to set new_pcm > (existing map type if any), and then calls > is_new_memtype_allowed() to verify if converting to new_pcm > is allowed when pcm (request type) is different from new_pcm. > > When WT is requested, the caller expects that writes are > ordered and uncached. Therefore, this patch changes > is_new_memtype_allowed() to disallow the following cases. > > - If the request is WT, mapping type cannot be WB > - If the request is WT, mapping type cannot be WC > > Signed-off-by: Toshi Kani <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
