On Tue, 2012-09-11 at 16:25 -0700, Andrew Morton wrote: > Asking for a 256k allocation is pretty crazy - this is an operating > system kernel, not a userspace application. > > I'm wondering if this is due to a recent change, but I'm having trouble > working out where the allocation call site is. > -- (Adding Marc Merlin to CC, since he reported same problem) Thats the firmware loading in iwlwifi driver. Not sure if it can use SG. drivers/net/wireless/iwlwifi/iwl-drv.c iwl_alloc_ucode() -> iwl_alloc_fw_desc() -> dma_alloc_coherent() It seems some sections of /lib/firmware/iwlwifi*.ucode files are above 128 Kbytes, so dma_alloc_coherent() try order-5 allocations # ls -l /lib/firmware/iwlwifi*.ucode -rw-r--r-- 1 root root 335056 2012-01-23 18:20 /lib/firmware/iwlwifi-1000-3.ucode -rw-r--r-- 1 root root 337520 2012-01-23 18:20 /lib/firmware/iwlwifi-1000-5.ucode -rw-r--r-- 1 root root 689680 2012-01-24 19:18 /lib/firmware/iwlwifi-105-6.ucode -rw-r--r-- 1 root root 701228 2012-01-24 19:18 /lib/firmware/iwlwifi-135-6.ucode -rw-r--r-- 1 root root 695876 2012-01-24 19:19 /lib/firmware/iwlwifi-2000-6.ucode -rw-r--r-- 1 root root 707392 2012-01-24 19:19 /lib/firmware/iwlwifi-2030-6.ucode -rw-r--r-- 1 root root 150100 2012-01-23 18:20 /lib/firmware/iwlwifi-3945-2.ucode -rw-r--r-- 1 root root 187972 2012-01-23 18:20 /lib/firmware/iwlwifi-4965-2.ucode -rw-r--r-- 1 root root 345008 2012-01-23 18:20 /lib/firmware/iwlwifi-5000-1.ucode -rw-r--r-- 1 root root 353240 2012-01-23 18:20 /lib/firmware/iwlwifi-5000-2.ucode -rw-r--r-- 1 root root 340696 2012-01-23 18:21 /lib/firmware/iwlwifi-5000-5.ucode -rw-r--r-- 1 root root 337400 2012-01-23 18:20 /lib/firmware/iwlwifi-5150-2.ucode -rw-r--r-- 1 root root 462280 2012-01-24 19:20 /lib/firmware/iwlwifi-6000-4.ucode -rw-r--r-- 1 root root 444128 2012-01-24 19:20 /lib/firmware/iwlwifi-6000g2a-5.ucode -rw-r--r-- 1 root root 460912 2012-01-24 19:20 /lib/firmware/iwlwifi-6000g2b-5.ucode -rw-r--r-- 1 root root 679436 2012-01-24 19:19 /lib/firmware/iwlwifi-6000g2b-6.ucode -rw-r--r-- 1 root root 463692 2012-01-23 18:20 /lib/firmware/iwlwifi-6050-4.ucode -rw-r--r-- 1 root root 469780 2012-01-23 18:20 /lib/firmware/iwlwifi-6050-5.ucode -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>