https://bugzilla.kernel.org/show_bug.cgi?id=51071
--- Comment #1 from Zdenek Kabelac <zdenek.kabe...@gmail.com> 2012-11-28
17:16:02 ---
Here is related disassembled code:
/* Get the prefix scope. A null scope means use the root scope */
if ((!scope_info) || (!scope_info->scope.node)) {
0000000000000054 <acpi_ns_lookup+0x54> test %rdi,%rdi
0000000000000057 <acpi_ns_lookup+0x57> mov %rsi,%r12
000000000000005a <acpi_ns_lookup+0x5a> mov %r8d,%r14d
000000000000005d <acpi_ns_lookup+0x5d> je 0000000000000068
<acpi_ns_lookup+0x68>
000000000000005f <acpi_ns_lookup+0x5f> mov 0x10(%rdi),%rbx
0000000000000063 <acpi_ns_lookup+0x63> test %rbx,%rbx
0000000000000066 <acpi_ns_lookup+0x66> jne 00000000000000a1
<acpi_ns_lookup+0xa1>
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
0000000000000068 <acpi_ns_lookup+0x68> mov %rax,(%rsp)
000000000000006c <acpi_ns_lookup+0x6c> mov $0x0,%r9
0000000000000073 <acpi_ns_lookup+0x73> mov $0x140,%esi
0000000000000078 <acpi_ns_lookup+0x78> mov $0x10,%r8d
000000000000007e <acpi_ns_lookup+0x7e> mov $0x0,%rcx
0000000000000085 <acpi_ns_lookup+0x85> xor %eax,%eax
0000000000000087 <acpi_ns_lookup+0x87> mov $0x0,%rdx
000000000000008e <acpi_ns_lookup+0x8e> mov $0x400,%edi
0000000000000093 <acpi_ns_lookup+0x93> callq 0000000000000098
<acpi_ns_lookup+0x98>
"Null scope prefix, using root node (%p)\n",
acpi_gbl_root_node));
prefix_node = acpi_gbl_root_node;
0000000000000098 <acpi_ns_lookup+0x98> mov 0x0(%rip),%rbx #
000000000000009f <acpi_ns_lookup+0x9f>
000000000000009f <acpi_ns_lookup+0x9f> jmp 00000000000000f9
<acpi_ns_lookup+0xf9>
} else {
prefix_node = scope_info->scope.node;
if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
00000000000000a1 <acpi_ns_lookup+0xa1> cmpb $0xf,0x8(%rbx)
00000000000000a5 <acpi_ns_lookup+0xa5> je 00000000000000da
<acpi_ns_lookup+0xda>
ACPI_DESC_TYPE_NAMED) {
ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]",
00000000000000a7 <acpi_ns_lookup+0xa7> mov %rbx,%rdi
00000000000000aa <acpi_ns_lookup+0xaa> callq 00000000000000af
<acpi_ns_lookup+0xaf>
00000000000000af <acpi_ns_lookup+0xaf> mov %rbx,%rcx
00000000000000b2 <acpi_ns_lookup+0xb2> mov $0x0,%rdx
00000000000000b9 <acpi_ns_lookup+0xb9> mov %rax,%r8
00000000000000bc <acpi_ns_lookup+0xbc> mov $0x149,%esi
00000000000000c1 <acpi_ns_lookup+0xc1> mov $0x0,%rdi
00000000000000c8 <acpi_ns_lookup+0xc8> xor %eax,%eax
00000000000000ca <acpi_ns_lookup+0xca> callq 00000000000000cf
<acpi_ns_lookup+0xcf>
prefix_node,
acpi_ut_get_descriptor_name(prefix_node)));
return_ACPI_STATUS(AE_AML_INTERNAL);
--
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