On Monday 30 August 2010 07:13:17 Boaz Harrosh wrote: > On 08/23/2010 10:59 PM, Jiri Slaby wrote: > > Hi, > > > > I see that the aha152x driver for pcmcia is marked as unsupported on > > 64bit. But I also see a patch [1] which removes the restriction based on > > user's testing in bugzilla [2]. > > > > Is there a reason why it would have to be marked as !64BIT? I'm asking > > because there is an opensuse user with this card who updated to 64-bit > > distro and lost this driver thereafter. > > > > [1] http://kerneltrap.org/mailarchive/linux-scsi/2010/3/6/6832393 > > [2] https://bugzilla.kernel.org/show_bug.cgi?id=14333 > > > > thanks, > > If memory serves correctly, it might be that you need more then 4 Gbyte > of memory installed to exercise the bug, something about IO bouncing > addresses > 4G. If the machine is using SWIOTLB, then the bounce buffer would be activated. By default if your machine has more than 4GB compiled under x86_64 the SWIOTLB is turned on - but if you have an Intel/AMD IOMMU it gets turned off. Which is OK as the Intel/AMD IOMMUs would handle the 4GB restricted devices. So as long as the driver has pci_dma_mask_set. Looking at the git gui blame tool history, the reason that was added was for 'allow drivers to be built non-modular'. So, does this driver build if you make it non-modular? -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
