Get UML to use the generic bug support rather than arch specific one.

If I insert an artificial bug right before loading init, I get this:

Kernel panic - not syncing: Kernel mode signal 4

EIP: 0023:[] CPU: 0 Not tainted ESP: 002b:f7fd4fbc EFLAGS: 00000246
Not tainted
EAX: 00000000 EBX: 00007870 ECX: 00000013 EDX: 00007870
ESI: 0000786d EDI: 00000011 EBP: f7fd4fd8 DS: 002b ES: 002b
08273bec: [] show_regs+0x104/0x106
08273c08: [] panic_exit+0x2c/0x4b
08273c18: [] notifier_call_chain+0x32/0x5b
08273c38: [] __atomic_notifier_call_chain+0x30/0x32
08273c54: [] atomic_notifier_call_chain+0x2f/0x31
08273c70: [] panic+0x75/0x131
08273c94: [] relay_signal+0x87/0x95
08273cb0: [] sig_handler_common_skas+0x9e/0x120
08273cd8: [] sig_handler+0x28/0x4f
08273cec: [] handle_signal+0x53/0x89
08273d0c: [] hard_handler+0x18/0x28
08273d1c: [] transitions+0xf7d598b8/0xfffffff0

With this patch in place, this is how it looks:

BUG: failure at init/main.c:779/init_post()!
Kernel panic - not syncing: BUG!

EIP: 0023:[] CPU: 0 Not tainted ESP: 002b:f7f0dfbc EFLAGS: 00000246
Not tainted
EAX: 00000000 EBX: 000069db ECX: 00000013 EDX: 000069db
ESI: 000069d8 EDI: 00000011 EBP: f7f0dfd8 DS: 002b ES: 002b
098efedc: [] show_regs+0x104/0x106
098efef8: [] panic_exit+0x2c/0x4b
098eff08: [] notifier_call_chain+0x32/0x5b
098eff28: [] __atomic_notifier_call_chain+0x30/0x32
098eff44: [] atomic_notifier_call_chain+0x2f/0x31
098eff60: [] panic+0x75/0x131
098eff84: [] init_post+0xcd/0xe8
098eff9c: [] kernel_init+0x8e/0x9a
098effb4: [] run_kernel_thread+0x41/0x53
098effe0: [] new_thread_handler+0x62/0x8b
098efffc: [] 0xa55a5a5a

[ jdike - added BUG_TABLE to linker script ]

Signed-off-by: Nick Piggin
Signed-off-by: Jeff Dike
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds