Hi Christoph, I test kernel from your 'dma-alloc-always-zero' branch, and as I can see we have DMA peripherals (like USB) broken. There are the errors example I got during USB initializing: ------------------------------>8-------------------------------- usb 1-1: device descriptor read/64, error -110 usb usb1-port1: attempt power cycle usb 1-1: new high-speed USB device number 4 using ehci-platform usb 1-1: device descriptor read/64, error -110 usb 1-1: device descriptor read/64, error -110 usb 1-1: new high-speed USB device number 5 using ehci-platform usb 1-1: device descriptor read/64, error -110 usb 1-1: device descriptor read/64, error -110 usb usb1-port1: unable to enumerate USB device usb 2-1: new full-speed USB device number 2 using ohci-platform usb 2-1: device descriptor read/all, error -84 usb 2-1: new full-speed USB device number 3 using ohci-platform usb 2-1: device descriptor read/all, error -84 usb usb2-port1: attempt power cycle usb 2-1: new full-speed USB device number 4 using ohci-platform usb 2-1: device descriptor read/8, error -62 usb 2-1: device descriptor read/8, error -62 usb 2-1: new full-speed USB device number 5 using ohci-platform usb 2-1: device descriptor read/8, error -84 usb 2-1: device descriptor read/8, error -84 usb usb2-port1: unable to enumerate USB device [snip] ------------------------------8<-------------------------------- On Wed, 2018-12-19 at 17:59 +0100, Christoph Hellwig wrote: > FYI, I've picked this up for dma-mapping for-next now. > > _______________________________________________ > linux-snps-arc mailing list > linux-snps-arc@xxxxxxxxxxxxxxxxxxx > https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.infradead.org_mailman_listinfo_linux-2Dsnps-2Darc&d=DwICAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=ZlJN > 1MriPUTkBKCrPSx67GmaplEUGcAEk9yPtCLdUXI&m=naBCT96A4RSQJLzBWzuCcmptFGiQDfFTOWJpprqDIVk&s=cHF84va89ofP6VlrV683ewENUXdaLW7opamLZSkZBgk&e= -- Eugeniy Paltsev
