package/kernel/linux/hotfix-sparc64-sun4u-8g.patch

   1 # --- T2-COPYRIGHT-NOTE-BEGIN ---
   2 # T2 SDE: package/*/linux/hotfix-sparc64-sun4u-8g.patch
   3 # Copyright (C) 2024 The T2 SDE Project
   4 #
   5 # This Copyright note is generated by scripts/Create-CopyPatch,
   6 # more information can be found in the files COPYING and README.
   7 #
   8 # This patch file is dual-licensed. It is available under the license the
   9 # patched project is licensed under, as long as it is an OpenSource license
  10 # as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
  11 # of the GNU General Public License version 2 as used by the T2 SDE.
  12 # --- T2-COPYRIGHT-NOTE-END ---
  13
  14 Unable to handle kernel NULL pointer dereference
  15 tsk->{mm,active_mm}->context = 0000000000000000
  16 tsk->{mm,active_mm}->pgd = fff00001ff002000
  17               \|/ ____ \|/
  18               "@'/ .. \`@"
  19               /_| \__/ |_\
  20                  \__U_/
  21 swapper(0): Oops [#1]
  22 CPU: 0 PID: 0 Comm: swapper Not tainted 6.10.11-t2 #45
  23 TSTATE: 0000009980e01602 TPC: 0000000000c5ec98 TNPC: 0000000000c5ec9c Y: f9e69dcb    Not tainted
  24 TPC: <subsection_map_init+0x50/0x98>
  25 g0: 0000000010d7d038 g1: 0000000000000000 g2: 0000000000000000 g3: 0000000000000001
  26 g4: 0000000000b95d80 g5: 0000000000000000 g6: 0000000000b84000 g7: 0000000000000000
  27 o0: 0000000000000000 o1: ffffffffffffffff o2: 0000000000000000 o3: 0000000000ae1c40
  28 o4: 0000000000b87ae8 o5: 0000000000000000 sp: 0000000000b871b1 ret_pc: 0000000000c5ec90
  29 RPC: <subsection_map_init+0x48/0x98>
  30 l0: 0000000000020000 l1: 0000000000020000 l2: 0000000000b0d730 l3: 0000000000000001
  31 l4: 0000000000000000 l5: 0000000000000001 l6: 0000000001dfefbf l7: 00000001ff8f3110
  32 i0: 0000000000000000 i1: 00000000000ff7ff i2: 0000000000000001 i3: 000000000001ffff
  33 i4: 0000000000000000 i5: 0000000000000007 i6: 0000000000b87261 i7: 0000000000c5a4c8
  34 I7: <free_area_init+0x58c/0xc78>
  35 Call Trace:
  36 [<0000000000c5a4c8>] free_area_init+0x58c/0xc78
  37 [<0000000000c509c8>] paging_init+0xd1c/0xdd0
  38 [<0000000000c4b848>] setup_arch+0x110/0x774
  39 [<0000000000c48664>] start_kernel+0x58/0x778
  40 [<0000000000c4b584>] start_early_boot+0x78/0x22c
  41 [<00000000009b5264>] tlb_fixup_done+0x4c/0x54
  42 [<00000000002f1a28>] 0x2f1a28
  43 Disabling lock debugging due to kernel taint
  44 Caller[0000000000c5a4c8]: free_area_init+0x58c/0xc78
  45 Caller[0000000000c509c8]: paging_init+0xd1c/0xdd0
  46 Caller[0000000000c4b848]: setup_arch+0x110/0x774
  47 Caller[0000000000c48664]: start_kernel+0x58/0x778
  48 Caller[0000000000c4b584]: start_early_boot+0x78/0x22c
  49 Caller[00000000009b5264]: tlb_fixup_done+0x4c/0x54
  50
  51 --- linux-6.10/arch/sparc/kernel/ktlb.S 2024-07-15 00:43:32.000000000 +0200
  52 +++ b/arch/sparc/kernel/ktlb.S  2024-09-24 20:18:35.373344860 +0200
  53 @@ -144,7 +144,7 @@
  54         brgez,pn        %g4, kvmap_dtlb_nonlinear
  55          nop
  56
  57 -#ifdef CONFIG_DEBUG_PAGEALLOC
  58 +#if 1 /* def CONFIG_DEBUG_PAGEALLOC */
  59         /* Index through the base page size TSB even for linear
  60          * mappings when using page allocation debugging.
  61          */
  62 --- linux-6.10/arch/sparc/mm/init_64.c  2024-07-15 00:43:32.000000000 +0200
  63 +++ b/arch/sparc/mm/init_64.c   2024-09-24 20:35:22.566682546 +0200
  64 @@ -1891,11 +1891,22 @@
  65  static void __init kernel_physical_mapping_init(void)
  66  {
  67         unsigned long i, mem_alloced = 0UL;
  68 +       unsigned long phys_mem = 0UL;
  69         bool use_huge = true;
  70
  71  #ifdef CONFIG_DEBUG_PAGEALLOC
  72         use_huge = false;
  73  #endif
  74 +
  75 +       if (tlb_type == cheetah_plus) {
  76 +               for (i = 0; i < pall_ents; i++)
  77 +                       phys_mem += pall[i].reg_size;
  78 +               printk("phys_mem: %ld\n", phys_mem);
  79 +
  80 +               if (phys_mem > 4294967296)
  81 +                       use_huge = false;
  82 +       }
  83 +
  84         for (i = 0; i < pall_ents; i++) {
  85                 unsigned long phys_start, phys_end;
  86