dumpstate cat /proc/pagetypeinfo会死机

Linux

背景：SCP核心板，2G或者1G的，无论是在Android4.0还是Android4.4情况下。当Android启动之后输入dumpstate或者是

cat /proc/pagetypeinfo 都会死机，但是pop的核心板没有这种现象


现象 ：


root@smdk4x12:/ # cat /proc/pagetypeinfo [   56.041558] Unable to handle kernel NULL pointer dereference at virtual address 00000004
[   56.048176] pgd = cf044000
[   56.050866] [00000004] *pgd=00000000
[   56.054427] Internal error: Oops: 5 [#1] PREEMPT SMP
[   56.059372] Modules linked in: wlan_mt6620 mtk_wmt_wifi bt_uhid mtk_stp_bt mtk_stp_uart mtk_stp_wmt mtk_hif_sdio
[   56.069530] CPU: 0    Not tainted  (3.0.15 #9)
[   56.073965] PC is at get_pageblock_flags_group+0x60/0x15c
[   56.079339] LR is at pagetypeinfo_showblockcount_print+0x25c/0x2d8
[   56.085501] pc : [<c00dd4a4>]    lr : [<c00f186c>]    psr: 600100d3
[   56.085504] sp : cf033e18  ip : 00000000  fp : cf033e34
[   56.096957] r10: c09a8280  r9 : 00000001  r8 : d0b4bc60
[   56.102165] r7 : c09d5b80  r6 : 000bff00  r5 : 00000000  r4 : 00000000
[   56.108675] r3 : 0000fe08  r2 : 00000002  r1 : 00000000  r0 : 00000000
[   56.115186] Flags: nZCv  IRQs off  FIQs off  Mode SVC_32  ISA ARM  Segment user
[   56.122477] Control: 10c5387d  Table: 4f04404a  DAC: 00000015
[   56.128205]
[   56.128207] PC: 0xc00dd424:
[   56.132457] d424  21a0100c e1a002c1 e792c100 e1a0133c e2210001 e2000001 e89da800 c09147a4
[   56.140616] d444  e1a0c00d e92dd8f0 e24cb004 e305cb80 e5904000 e34cc09d e59c3000 e3530000
[   56.148775] d464  0a000001 e1a04e24 e0833184 e5933000 e3c35003 e0650000 e1a002c0 e1a03ca0
[   56.156935] d484  e79cc103 e1a03820 e35c0000 0a000002 e1a03b83 e1a05ba3 e08cc185 e7e405d0
[   56.165094] d4a4  e59c5004 e0800080 e1510002 ca000038 e0803001 e0614002 e3a0c001 e3140001
[   56.173253] d4c4  e3a00000 1a00001c e283701f e2811001 e0177043 31a07003 e1a0408c e1a062c7
[   56.181412] d4e4  e7957106 e203601f e1a06637 e3160001 0a000000 e180000c e1520001 e283c001
[   56.189571] d504  b89da8f0 e35c0000 a1a0700c b2837020 e1a032c7 e20c701f e7956103 e1a03736
[   56.197731]
[   56.197733] LR: 0xc00f17ec:
[   56.201984] 17ec  e34c1088 eb010c3a e1a00008 e51b2030 e3051f4c e34c1088 eb010c35 e1a00008
[   56.210143] 180c  e3a0100a eb010942 e24bd028 e89daff0 e24b102c e0812100 e5123014 e283e001
[   56.218302] 182c  e502e014 eaffffb4 e5972000 e3520000 0affff8f e1a03b83 e1a0eba3 e092318e
[   56.226461] 184c  0affff8b e5930000 e3100002 0affff88 e3c02003 e0820005 e3a02002 ebffaef5
[   56.234621] 186c  e3500004 caffff82 e24be02c e08ec100 e53c0014 e2801001 e58c1000 eaffff7c
[   56.242780] 188c  e5972000 e3520000 0affff82 e1a01b83 e1a03ba1 e0923183 0affff7e e5933000
[   56.250939] 18ac  e3130002 0affff7b e3c32003 e3a01000 e0820005 e3a02002 ebffaede e3500004
[   56.259098] 18cc  caffff74 e24b302c e083e100 e53e0014 e280c001 e58ec000 eaffff6e e1a0c00d
[   56.267258]
[   56.267260] SP: 0xcf033d98:
[   56.271511] 3d98  c0885f4c c0885f52 d1583000 d1582668 cf033e0c d1582668 ffffffff cf033e04
[   56.279670] 3db8  000bff00 c09d5b80 cf033e34 cf033dd0 c00462ec c003f52c 00000000 00000000
[   56.287829] 3dd8  00000002 0000fe08 00000000 00000000 000bff00 c09d5b80 d0b4bc60 00000001
[   56.295988] 3df8  c09a8280 cf033e34 00000000 cf033e18 c00f186c c00dd4a4 600100d3 ffffffff
[   56.304147] 3e18  0006e000 00dc0000 000bff00 c09d5b80 cf033e84 cf033e38 c00f186c c00dd450
[   56.312307] 3e38  cf033e84 c09a7f60 c00f11e0 00000000 00000000 00000000 00000000 00000000
[   56.320466] 3e58  c0120de8 c09a7f60 c09a8280 c00f1610 d0b4bc60 c09a82a0 c09a7f60 20010053
[   56.328625] 3e78  cf033eac cf033e88 c00f105c c00f161c d0b4bc60 c09a7f60 00000000 407498d8
[   56.336785]
[   56.336786] FP: 0xcf033db4:
[   56.341037] 3db4  cf033e04 000bff00 c09d5b80 cf033e34 cf033dd0 c00462ec c003f52c 00000000
[   56.349197] 3dd4  00000000 00000002 0000fe08 00000000 00000000 000bff00 c09d5b80 d0b4bc60
[   56.357356] 3df4  00000001 c09a8280 cf033e34 00000000 cf033e18 c00f186c c00dd4a4 600100d3
[   56.365515] 3e14  ffffffff 0006e000 00dc0000 000bff00 c09d5b80 cf033e84 cf033e38 c00f186c
[   56.373674] 3e34  c00dd450 cf033e84 c09a7f60 c00f11e0 00000000 00000000 00000000 00000000
[   56.381833] 3e54  00000000 c0120de8 c09a7f60 c09a8280 c00f1610 d0b4bc60 c09a82a0 c09a7f60
[   56.389992] 3e74  20010053 cf033eac cf033e88 c00f105c c00f161c d0b4bc60 c09a7f60 00000000
[   56.398152] 3e94  407498d8 cf033ee8 cf033f78 cf033ecc cf033eb0 c00f1448 c00f0fd4 00000000
[   56.406312]
[   56.406313] R7: 0xc09d5b00:
[   56.410564] 5b00  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   56.418724] 5b20  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   56.426883] 5b40  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   56.435042] 5b60  00000000 00000000 9d74e35b 00000000 00000000 00000001 d2130400 00000000
[   56.443201] 5b80  c0000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   56.451360] 5ba0  00000000 00000003 00000000 00000000 00000000 00000000 d2002100 d2002180
[   56.459519] 5bc0  00000000 00000000 d2002200 d2002280 d2002300 d2002380 d2002400 d2002480
[   56.467679] 5be0  d2002500 d2002580 d2002600 d2002080 d2130300 00000000 d2002000 d2008400
[   56.475838]
[   56.475840] R8: 0xd0b4bbe0:
[   56.480091] bbe0  e0000000 ffffffff c0933c00 c09339e8 c09342e0 d0b4b774 c00aaf3c 00000000
[   56.488250] bc00  000029b2 d0b4bc04 d0b4bc04 00000003 d14168b0 00000000 00000000 d09cda00
[   56.496409] bc20  d0fc935c 00000001 00000000 00000000 4004dff0 7210bf60 00001fe5 d0b4bc3c
[   56.504568] bc40  d0b4bc3c 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   56.512728] bc60  d1582000 00001000 00000000 0000066a 00000000 00000000 00000000 00000000
[   56.520887] bc80  00000000 00000000 00000000 00000000 00000000 d0b4bc94 d0b4bc94 d0b2c960
[   56.529046] bca0  c05cd740 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   56.537205] bcc0  d0b4b840 00002711 00002711 00002711 00002711 00002711 00002711 00002711
[   56.545365]
[   56.545367] R10: 0xc09a8200:
[   56.549705] 8200  00000000 00000000 00000020 000009d5 00000005 00000000 000007e6 00000717
[   56.557864] 8220  0000069d 000001ec 00000000 00000000 00000000 00000000 00000000 00000000
[   56.566023] 8240  00000000 000000bf 000000ba 00000000 00000001 00000000 00000000 00000000
[   56.574182] 8260  c0de8000 00000400 0000000a c09a7f60 00040000 0002e000 0002da40 c0885770
[   56.582341] 8280  00000080 000001f7 0000036e 00000000 00000000 00000000 00000000 c00412b8
[   56.590500] 82a0  00000001 00000000 00000000 c19d6e38 c19d6e78 c09a82b4 c09a82b4 c18582d8
[   56.598660] 82c0  c18bb098 c09a82c4 c09a82c4 c09a82cc c09a82cc 000000cd c19d6dd8 c19d6dd8
[   56.606819] 82e0  c09a82e0 c09a82e0 c185a798 c18bc698 c09a82f0 c09a82f0 c09a82f8 c09a82f8
[   56.614980] Process sh (pid: 2183, stack limit = 0xcf0322f0)
[   56.620622] Stack: (0xcf033e18 to 0xcf034000)
[   56.624963] 3e00:                                                       0006e000 00dc0000
[   56.633124] 3e20: 000bff00 c09d5b80 cf033e84 cf033e38 c00f186c c00dd450 cf033e84 c09a7f60
[   56.641282] 3e40: c00f11e0 00000000 00000000 00000000 00000000 00000000 c0120de8 c09a7f60
[   56.649442] 3e60: c09a8280 c00f1610 d0b4bc60 c09a82a0 c09a7f60 20010053 cf033eac cf033e88
[   56.657601] 3e80: c00f105c c00f161c d0b4bc60 c09a7f60 00000000 407498d8 cf033ee8 cf033f78
[   56.665760] 3ea0: cf033ecc cf033eb0 c00f1448 c00f0fd4 00000000 d0b4bc60 cf0195a0 c05cd740
[   56.673919] 3ec0: cf033f1c cf033ed0 c0134cb0 c00f122c 00000000 d0b4bc88 00001000 407498d8
[   56.682078] 3ee0: d1582006 d200d0a0 00000000 00000000 00000101 d25f9200 c0134aa0 cf0195a0
[   56.690238] 3f00: 407498d8 00001000 cf032000 cf033f78 cf033f44 cf033f20 c015ff4c c0134aac
[   56.698397] 3f20: cf0195a0 00001000 407498d8 cf033f78 c0046ae8 00000000 cf033f74 cf033f48
[   56.706556] 3f40: c0112c64 c015fee4 cf033f94 cf033f58 c011076c cf0195a0 407498d8 00000000
[   56.714715] 3f60: 00000000 c0046ae8 cf033fa4 cf033f78 c0112dd8 c0112bc0 00000000 00000000
[   56.722874] 3f80: c0046ae8 00000000 00000004 4074515c 00000000 00000003 00000000 cf033fa8
[   56.731034] 3fa0: c0046940 c0112da4 00000004 4074515c 00000004 407498d8 00001000 00000000
[   56.739193] 3fc0: 00000004 4074515c 00000000 00000003 00001000 407498d8 40061b64 40057dd9
[   56.747352] 3fe0: 40058829 bedb6830 40050937 4024f380 60010050 00000004 fb3a1e7f 00000000
[   56.755508] Backtrace:
[   56.757945] [<c00dd444>] (get_pageblock_flags_group+0x0/0x15c) from [<c00f186c>] (pagetypeinfo_showblockcount_print+0x25c/0x2d8)
[   56.769483]  r7:c09d5b80 r6:000bff00 r5:00dc0000 r4:0006e000
[   56.775132] [<c00f1610>] (pagetypeinfo_showblockcount_print+0x0/0x2d8) from [<c00f105c>] (walk_zones_in_node+0x94/0xe4)
[   56.785893] [<c00f0fc8>] (walk_zones_in_node+0x0/0xe4) from [<c00f1448>] (pagetypeinfo_show+0x228/0x230)
[   56.795355] [<c00f1220>] (pagetypeinfo_show+0x0/0x230) from [<c0134cb0>] (seq_read+0x210/0x4e4)
[   56.804029]  r6:c05cd740 r5:cf0195a0 r4:d0b4bc60 r3:00000000
[   56.809678] [<c0134aa0>] (seq_read+0x0/0x4e4) from [<c015ff4c>] (proc_reg_read+0x74/0xa0)
[   56.817838] [<c015fed8>] (proc_reg_read+0x0/0xa0) from [<c0112c64>] (vfs_read+0xb0/0x14c)
[   56.825994] [<c0112bb4>] (vfs_read+0x0/0x14c) from [<c0112dd8>] (sys_read+0x40/0x78)
[   56.833715]  r8:c0046ae8 r7:00000000 r6:00000000 r5:407498d8 r4:cf0195a0
[   56.840406] [<c0112d98>] (sys_read+0x0/0x78) from [<c0046940>] (ret_fast_syscall+0x0/0x30)
[   56.848644]  r7:00000003 r6:00000000 r5:4074515c r4:00000004
[   56.854290] Code: e1a03b83 e1a05ba3 e08cc185 e7e405d0 (e59c5004)
[   56.860846] ---[ end trace 23d1b087f31882e3 ]---
[   56.864963] ***********enter  Panic*********
[   56.869230] panic_dump_info_set: 0x 0
[   56.872903] first 0xe4120001
[   56.875739] info is : 0xe4120001
[   56.879025] Kernel panic - not syncing: Fatal exception
[   56.884243] Backtrace:
[   56.886673] [<c004ae70>] (dump_backtrace+0x0/0x11c) from [<c05c3974>] (dump_stack+0x18/0x1c)
[   56.895095]  r6:0000000f r5:cf033c48 r4:c09acd00 r3:cf032000
[   56.900729] [<c05c395c>] (dump_stack+0x0/0x1c) from [<c05c3a10>] (panic+0x98/0x144)
[   56.908438] [<c05c3978>] (panic+0x0/0x144) from [<c004b3ec>] (die+0x1c8/0x1d8)
[   56.915580]  r3:c09acd10 r2:cf033c70 r1:cf032000 r0:c0878fc4
[   56.921216] [<c004b224>] (die+0x0/0x1d8) from [<c004f7d0>] (__do_kernel_fault+0x7c/0x8c)
[   56.929293]  r8:d26ea9c0 r7:00000005 r6:00000000 r5:00000004 r4:cf033dd0
[   56.935971] [<c004f754>] (__do_kernel_fault+0x0/0x8c) from [<c004f91c>] (do_page_fault+0x13c/0x1f0)
[   56.945073]  r8:d0b4bc60 r7:cf033dd0 r6:00000004 r5:00000005 r4:d26ea9c0
[   56.951503] r3:cf033dd0
[   56.954112] [<c004f7e0>] (do_page_fault+0x0/0x1f0) from [<c004fae8>] (do_translation_fault+0xa4/0xa8)
[   56.963328] [<c004fa44>] (do_translation_fault+0x0/0xa8) from [<c003f55c>] (do_DataAbort+0x3c/0xa4)
[   56.972399]  r8:d0b4bc60 r7:cf033dd0 r6:00000004 r5:c091c9f0 r4:00000005
[   56.978844] r3:c091c9a0
[   56.981455] [<c003f520>] (do_DataAbort+0x0/0xa4) from [<c00462ec>] (__dabt_svc+0x4c/0x60)
[   56.989619] Exception stack(0xcf033dd0 to 0xcf033e18)
[   56.994655] 3dc0:                                     00000000 00000000 00000002 0000fe08
[   57.002869] 3de0: 00000000 00000000 000bff00 c09d5b80 d0b4bc60 00000001 c09a8280 cf033e34
[   57.010975] 3e00: 00000000 cf033e18 c00f186c c00dd4a4 600100d3 ffffffff
[   57.017568]  r7:c09d5b80 r6:000bff00 r5:cf033e04 r4:ffffffff
[   57.023207] [<c00dd444>] (get_pageblock_flags_group+0x0/0x15c) from [<c00f186c>] (pagetypeinfo_showblockcount_print+0x25c/0x2d8)
[   57.034810]  r7:c09d5b80 r6:000bff00 r5:00dc0000 r4:0006e000
[   57.040393] [<c00f1610>] (pagetypeinfo_showblockcount_print+0x0/0x2d8) from [<c00f105c>] (walk_zones_in_node+0x94/0xe4)
[   57.051167] [<c00f0fc8>] (walk_zones_in_node+0x0/0xe4) from [<c00f1448>] (pagetypeinfo_show+0x228/0x230)
[   57.060627] [<c00f1220>] (pagetypeinfo_show+0x0/0x230) from [<c0134cb0>] (seq_read+0x210/0x4e4)
[   57.069359]  r6:c05cd740 r5:cf0195a0 r4:d0b4bc60 r3:00000000
[   57.074939] [<c0134aa0>] (seq_read+0x0/0x4e4) from [<c015ff4c>] (proc_reg_read+0x74/0xa0)
[   57.083109] [<c015fed8>] (proc_reg_read+0x0/0xa0) from [<c0112c64>] (vfs_read+0xb0/0x14c)
[   57.091267] [<c0112bb4>] (vfs_read+0x0/0x14c) from [<c0112dd8>] (sys_read+0x40/0x78)
[   57.099038]  r8:c0046ae8 r7:00000000 r6:00000000 r5:407498d8 r4:cf0195a0
[   57.105665] [<c0112d98>] (sys_read+0x0/0x78) from [<c0046940>] (ret_fast_syscall+0x0/0x30)
[   57.113916]  r7:00000003 r6:00000000 r5:4074515c r4:00000004




解决办法： scp核心板用的是DDR3他的bank是8个，但是pop用的DDR2他的bank应该是小于8（这个我在手册上没有找到，这是根据调试猜测的）。但是内核源码设置的NR_BANKS的值为8，而当NR_BANKS小于等于8的时候会出现错

误。

所以解决办法是在

iTop4412_Kernel_3.0/arch/arm/include/asm/setup.h

将 ：
#ifndef NR_BANKS
#define NR_BANKS 8
#endif
中的NR_BANKS改为大于8的数，我这里改的是12