tree b8b40f8f8e4c67f096abb339b902b92e36a9e6f5
parent 9e6b258b8ca9ac4abe04ffe90190440b6a4bf0ab
author Tejun Heo <tj@kernel.org> 1364608888 -0700
committer Tejun Heo <tj@kernel.org> 1364613609 -0700

dump_stack: unify debug information printed by show_regs()

show_regs() is inherently arch-dependent but it does make sense to
print generic debug information and some archs already do albeit in
slightly different forms.  This patch introduces a generic function to
print debug information from show_regs() so that different archs print
out the same information and it's much easier to modify what's
printed.

show_regs_print_current() prints out the same debug info as
dump_stack() does plus CPU, task and thread_info pointers.

* Archs which didn't print debug info now do.

  alpha, arc, blackfin, c6x, cris, frv, h8300, hexagon, ia64, m32r,
  metag, microblaze, mn10300, openrisc, parisc, score, sh64, sparc,
  um, xtensa

* Already prints debug info.  Replaced with show_regs_print_current().
  The printed information is superset of what used to be there.

  arm, arm64, avr32, mips, powerpc, sh32, tile, unicore32, x86

* The printed debug information includes arch-specific bits.  Left
  alone.

  s390

Note that now all archs print the debug info before actual register
dumps.

An example BUG() dump follows.

 kernel BUG at /work/os/work/kernel/workqueue.c:4841!
 invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
 Modules linked in:
 Pid: 1, comm: swapper/0 Tainted: G        W    3.9.0-rc1-work+ #20 empty empty/S3992
 CPU:0 task: ffff88007c85e040 ti: ffff88007c860000 task.ti: ffff88007c860000
 RIP: 0010:[<ffffffff8234a042>]  [<ffffffff8234a042>] init_workqueues+0x15/0x17
 RSP: 0000:ffff88007c861ec8  EFLAGS: 00010296
 RAX: 0000000000000024 RBX: ffffffff82446608 RCX: 0000000000000001
 RDX: 0000000000000046 RSI: 0000000000000000 RDI: 0000000000000009
 RBP: ffff88007c861ec8 R08: 0000000000000000 R09: 0000000000000000
 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8234a02d
 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 FS:  0000000000000000(0000) GS:ffff88007dc00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
 CR2: ffff88015f7ff000 CR3: 00000000021f1000 CR4: 00000000000007f0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
 Stack:
  ffff88007c861ef8 ffffffff81000312 ffffffff82446608 ffff88007c85e650
  0000000000000003 0000000000000000 ffff88007c861f38 ffffffff82335e5d
  ffff88007c862080 ffffffff8223d8c0 ffff88007c862080 ffffffff81c47730
 Call Trace:
  [<ffffffff81000312>] do_one_initcall+0x122/0x170
  [<ffffffff82335e5d>] kernel_init_freeable+0x9b/0x1c8
  ...

v2: Typo fix in x86-32.

Signed-off-by: Tejun Heo <tj@kernel.org>