Hi Tejun, On Fri, Feb 26, 2016 at 9:21 AM, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > On Thu, Feb 25, 2016 at 10:42 PM, Tejun Heo <tj@xxxxxxxxxx> wrote: >> On Thu, Feb 25, 2016 at 4:40 PM, Tejun Heo <tj@xxxxxxxxxx> wrote: >>> Is this the problem fixed by the following patch from Harvey? >>> >>> http://lkml.kernel.org/g/CAMuHMdU0=_TJVfy=-zXWHkfJSWH_fJULBrL8J9T60QS48WbYcQ@xxxxxxxxxxxxxx >> >> Oops, I meant >> >> http://lkml.kernel.org/g/1456327003-16295-1-git-send-email-harvey.hunt@xxxxxxxxxx > > Thanks, looks plausible, I'll give it a try. > > Note that I couldn't reproduce this at will, so I'll just let you know if I > see it again, despite this patch. Unfortunately I've just got another one, with the above patch applied: sata_rcar ee300000.sata: DMA-API: cpu touching an active dma mapped cacheline [cln=0x000000000090ff40] ------------[ cut here ]------------ WARNING: at lib/dma-debug.c:604 Modules linked in: CPU: 2 PID: 329 Comm: udevd Not tainted 4.5.0-rc5-salvator-x-04739-gd9f979182e2877a4 #557 Hardware name: Renesas Salvator-X board based on r8a7795 (DT) task: ffffffc6fa63a180 ti: ffffffc6fa7c4000 task.ti: ffffffc6fa7c4000 PC is at debug_dma_assert_idle+0x180/0x1d0 LR is at debug_dma_assert_idle+0x180/0x1d0 pc : [<ffffff8004222b00>] lr : [<ffffff8004222b00>] pstate: 60000145 sp : ffffffc6fa7c7c20 x29: ffffffc6fa7c7c20 x28: 00e00000487fafd3 x27: ffffffc03b010f40 x26: 0000000000000000 x25: ffffffc03b010f40 x24: 0000000000000140 x23: ffffff80047219b8 x22: ffffff80047a1000 x21: ffffff80046f1000 x20: ffffff8004721000 x19: ffffffc6fb03d600 x18: 0000007feb6bbf20 x17: 0000007fa0722650 x16: 000000557d095af0 x15: 0000007fa07f2588 x14: 70616d20616d6420 x13: 657669746361206e x12: 6120676e69686375 x11: 6f7420757063203a x10: 4950412d414d4420 x9 : 3a617461732e3030 x8 : ffffff80047564d4 x7 : 0000000000000000 x6 : 0000000000000004 x5 : 0000000000000016 x4 : 0000000000000066 x3 : 00ffffffffffffff x2 : 00000000dead4ead x1 : 0000000000000140 x0 : 0000000000000066 ---[ end trace 7f71ed044e72e67d ]--- Call trace: Exception stack(0xffffffc6fa7c7a60 to 0xffffffc6fa7c7b80) 7a60: ffffffc6fb03d600 ffffff8004721000 ffffffc6fa7c7c20 ffffff8004222b00 7a80: ffffffc6fa7c7aa0 ffffff80040d1dcc ffffff8004703138 0000000000000004 7aa0: ffffffc6fa7c7ac0 ffffff80040d3a00 0000000000000002 0000000000000004 7ac0: ffffffc6fa7c7b60 ffffff80040d3bf4 ffffffc6fb03d600 ffffff8004721000 7ae0: ffffff80046f1000 ffffff80047a1000 ffffff80047219b8 0000000000000140 7b00: 0000000000000066 0000000000000140 00000000dead4ead 00ffffffffffffff 7b20: 0000000000000066 0000000000000016 0000000000000004 0000000000000000 7b40: ffffff80047564d4 3a617461732e3030 4950412d414d4420 6f7420757063203a 7b60: 6120676e69686375 657669746361206e 70616d20616d6420 0000007fa07f2588 [<ffffff8004222b00>] debug_dma_assert_idle+0x180/0x1d0 [<ffffff800412b0fc>] wp_page_copy.isra.109+0xfc/0x57c [<ffffff800412f118>] handle_mm_fault+0x125c/0x1300 [<ffffff8004092894>] do_page_fault+0x184/0x328 [<ffffff8004082250>] do_mem_abort+0x40/0x9c Exception stack(0xffffffc6fa7c7e30 to 0xffffffc6fa7c7f50) 7e20: 0000000000000000 000000557d0a6740 7e40: ffffffffffffffff 0000007fa0722798 00000000a0000000 0000000000000015 7e60: 000000000000011e 00000000000000d7 ffffffc6fa7c7e80 ffffff8004133120 7e80: ffffffc6fa7c7ec0 ffffff8004133140 0000000000000000 0000000000000000 7ea0: ffffffffffffffff 00000000365c03fd 0000000000000000 0000000000010000 7ec0: 0000000000000000 ffffff80040854f0 0000000000000000 0000000000000007 7ee0: 0000000000000038 0000000000000040 0000007feb6c0188 0000000000000002 7f00: 0000000000000000 726f635f38766d72 003735615f786574 fefeff3634605e77 7f20: 7f7f7f7f7f7f7f7f 0101010101010101 0000000000000028 0000000000000010 7f40: 0000000000000000 0000007fa07f2588 [<ffffff8004085124>] el0_da+0x18/0x1c Mapped at: [<ffffff8004220a08>] dma_entry_alloc+0x98/0xac [<ffffff8004222390>] debug_dma_alloc_coherent+0x48/0xe0 [<ffffff80042926d8>] dmam_alloc_coherent+0xa8/0xf8 [<ffffff80042c77dc>] ata_bmdma_port_start+0x40/0x5c [<ffffff80042b6974>] ata_host_start+0xf8/0x19c Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
