On Wednesday 26 March 2008 11:24:41 am Alexey Starikovskiy wrote:1. drivers/acpi/namespace/nsutils.c:419
Bjorn Helgaas wrote:
I'm curious about how this works. I disassembled the DSDT fromACPI is supposed to add trailing underscore for pad all names to 4 bytes.
http://bugzilla.kernel.org/show_bug.cgi?id=4773 (I attached the disassembly
at http://bugzilla.kernel.org/attachment.cgi?id=15448&action=view), and
the _PRT contains "_SB" and "ISA" (no trailing underscores):
Package (0x04)
{
0x000DFFFF, 0x00, \_SB.PCI0.ISA.LNKA, 0x00
}
But by the time we get to acpi_pci_irq_add_entry(), we've added the
underscores somewhere (see
http://bugzilla.kernel.org/attachment.cgi?id=15423&action=view):
0000:00:0d[A] -> \_SB_.PCI0.ISA_.LNKA
I don't know where this happens, but it certainly confused me, and
it seems like it could lead to other bugs.
So ISA will be padded to ISA_.
The questions are "where does this happen?" and "why does it not
apply to other things like asus_acpi.c?"