Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> writes:
> On Mon, Jan 27, 2014 at 08:09:55PM +0100, Tom Gundersen wrote:
>> Commit 78551277e4df5: "Input: i8042 - add PNP modaliases" had a bug, where the
>> second call to MODULE_DEVICE_TABLE() overrode the first resulting in not all
>> the modaliases being exposed.
>>
>> This fixes the problem by including the name of the device_id table in the
>> __mod_*_device_table alias, allowing us to export several device_id tables
>> per module.
>>
>> Suggested-by: Kay Sievers <kay@xxxxxxxx>
>> Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
>> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>> Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
>> ---
>> include/linux/module.h | 2 +-
>> scripts/mod/file2alias.c | 14 +++++++++-----
>> 2 files changed, 10 insertions(+), 6 deletions(-)
>
> Ah, very nice, I've wanted this for a while now, it would make a number
> of different drivers much smaller and simpler to add new device ids to
> (no multiple lists of ids, one for the module loader and one for the
> sub-driver that is in the single file.)
You never asked :(
I've applied, this, but I'm actually amazed this patch works. C is
weird sometimes. It changes declarations of the form:
extern const struct pci_device_id __mod_pci_device_id_table
__attribute__ ((unused, alias("e1000_pci_tbl"));
Into:
extern const struct pci__e1000_pci_tbl_device_id __mod_pci__e1000_pci_tbl_device_id_table
__attribute__ ((unused, alias("e1000_pci_tbl"));
Now, that's a completely unknown type, but gcc doesn't care because it's
just an extern declaration. It does insert the alias, which is all we
care about.
We would normally use a special section for this, so it's mainly
historical. Now we have DEFINE_PCI_DEVICE_TABLE etc, we should
use those to put it in a special section (eg. "pci_ids") and
grab that directly.
Volunteers welcome :)
Rusty.
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