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Message-ID: <1303266817.11237.37.camel@mulgrave.site> Date: Tue, 19 Apr 2011 21:33:37 -0500 From: James Bottomley <James.Bottomley@...senPartnership.com> To: Christoph Lameter <cl@...ux.com> Cc: Pekka Enberg <penberg@...nel.org>, Michal Hocko <mhocko@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>, Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>, linux-parisc@...r.kernel.org, David Rientjes <rientjes@...gle.com> Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards On Tue, 2011-04-19 at 16:58 -0500, Christoph Lameter wrote: > On Tue, 19 Apr 2011, James Bottomley wrote: > > > > Which part of me telling you that you will break lots of other things in > > > the core kernel dont you get? > > > > I get that you tell me this ... however, the systems that, according to > > you, should be failing to get to boot prompt do, in fact, manage it. > > If you dont use certain subsystems then it may work. Also do you run with > debuggin on. > > The following patch is I think what would be needed to fix it. Not really: crashes immediately on boot [ 0.000000] FP[0] enabled: Rev 1 Model 20 [ 0.000000] The 64-bit Kernel has started... [ 0.000000] bootconsole [ttyB0] enabled [ 0.000000] Initialized PDC Console for debugging. [ 0.000000] Determining PDC firmware type: 64 bit PAT. [ 0.000000] model 00008870 00000491 00000000 00000002 3e0505e7352af710 100000f0 00000008 000000b2 000000b2 [ 0.000000] vers 00000301 [ 0.000000] CPUID vers 20 rev 4 (0x00000284) [ 0.000000] capabilities 0x35 [ 0.000000] model 9000/800/rp3440 [ 0.000000] parisc_cache_init: Only equivalent aliasing supported! [ 0.000000] Memory Ranges: [ 0.000000] 0) Start 0x0000000000000000 End 0x000000003fffffff Size 1024 MB [ 0.000000] 1) Start 0x0000004040000000 End 0x000000407fdfffff Size 1022 MB [ 0.000000] Total Memory: 2046 MB [ 0.000000] initrd: 7f390000-7ffedf6d [ 0.000000] initrd: reserving 3f390000-3ffedf6d (mem_max 7fe00000) [ 0.000000] ------------[ cut here ]------------ [ 0.000000] kernel BUG at mm/mm_init.c:127! [ 0.000000] [ 0.000000] YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI [ 0.000000] PSW: 00001000000001001111111100001110 Not tainted [ 0.000000] r00-03 000000ff0804ff0e 000000004076a640 0000000040798c50 0000004080000000 [ 0.000000] r04-07 0000000040746e40 0000000004040000 0000000000000001 0000000040654150 [ 0.000000] r08-11 00000000405bd540 000000000407fe00 0000000000000001 0000000000000000 [ 0.000000] r12-15 00000000405bc740 000f000000000000 00000000000001ff 000000004076a640 [ 0.000000] r16-19 00000000000000ff 0000000000000000 2000000000000000 0000000000000000 [ 0.000000] r20-23 0000004080000000 00000000405bd908 0000000000000000 0000000004040000 [ 0.000000] r24-27 0000000000000001 0000000000000000 0000004080000000 0000000040746e40 [ 0.000000] r28-31 2000000000000000 00000000405b0610 00000000405b0640 0000000000000000 [ 0.000000] sr00-03 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 0.000000] sr04-07 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 0.000000] [ 0.000000] IASQ: 0000000000000000 0000000000000000 IAOQ: 0000000040798fac 0000000040798fb0 [ 0.000000] IIR: 03ffe01f ISR: 0000000010350000 IOR: 0000010000000000 [ 0.000000] CPU: 0 CR30: 00000000405b0000 CR31: fffffff0f0e098e0 [ 0.000000] ORIG_R28: 000000000003fe00 [ 0.000000] IAOQ[0]: mminit_verify_page_links+0x84/0xa0 [ 0.000000] IAOQ[1]: mminit_verify_page_links+0x88/0xa0 [ 0.000000] RP(r2): memmap_init_zone+0x148/0x2a0 [ 0.000000] Backtrace: [ 0.000000] [<0000000040798c50>] memmap_init_zone+0x148/0x2a0 [ 0.000000] [<0000000040777ca8>] free_area_init_node+0x3c8/0x518 [ 0.000000] [<000000004076fde0>] paging_init+0x928/0xb20 [ 0.000000] [<0000000040770a48>] setup_arch+0xe8/0x120 [ 0.000000] [<000000004076c9a0>] start_kernel+0xf0/0x830 [ 0.000000] [<000000004011f4fc>] start_parisc+0xa4/0xb8 [ 0.000000] [<00000000404b0f0c>] packet_ioctl+0x1e4/0x208 [ 0.000000] [<00000000404a79d0>] unix_ioctl+0x70/0x168 [ 0.000000] [<0000000040482d24>] ip_mc_gsfget+0x14c/0x200 [ 0.000000] [<000000004046cc20>] raw_ioctl+0xe8/0x118 [ 0.000000] [<000000004044f524>] do_tcp_getsockopt+0x5c4/0x5d0 [ 0.000000] [<0000000040432d64>] netlink_getsockopt+0x15c/0x178 [ 0.000000] [ 0.000000] Backtrace: [ 0.000000] [<000000004011f984>] show_stack+0x14/0x20 [ 0.000000] [<000000004011f9a8>] dump_stack+0x18/0x28 [ 0.000000] [<000000004012022c>] die_if_kernel+0x194/0x258 [ 0.000000] [<0000000040120b30>] handle_interruption+0x840/0x8f8 [ 0.000000] [<0000000040798fac>] mminit_verify_page_links+0x84/0xa0 [ 0.000000] [ 0.000000] ---[ end trace 139ce121c98e96c9 ]--- [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.000000] Backtrace: [ 0.000000] [<000000004011f984>] show_stack+0x14/0x20 [ 0.000000] [<000000004011f9a8>] dump_stack+0x18/0x28 [ 0.000000] [<000000004015945c>] panic+0xd4/0x368 [ 0.000000] [<000000004015f054>] do_exit+0x89c/0x9d8 [ 0.000000] [<00000000401202d4>] die_if_kernel+0x23c/0x258 [ 0.000000] [<0000000040120b30>] handle_interruption+0x840/0x8f8 [ 0.000000] [<0000000040798fac>] mminit_verify_page_links+0x84/0xa0 [ 0.000000] There's a lot more to discontigmem than just page_to_nid ... there's the whole pfn_to_nid() thing as well James -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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