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Revision 11cc92eb747aace5aa2b54b65b5cb8325a8981de authored by Michael Ellerman on 25 December 2020, 11:30:58 UTC, committed by Linus Torvalds on 25 December 2020, 19:02:39 UTC 
genirq: Fix export of irq_to_desc() for powerpc KVM
 
Commit 64a1b95bb9fe ("genirq: Restrict export of irq_to_desc()") removed
the export of irq_to_desc() unless powerpc KVM is being built, because
there is still a use of irq_to_desc() in modular code there.

However it used:

  #ifdef CONFIG_KVM_BOOK3S_64_HV

Which doesn't work when that symbol is =m, leading to a build failure:

  ERROR: modpost: "irq_to_desc" [arch/powerpc/kvm/kvm-hv.ko] undefined!

Fix it by checking for the definedness of the correct symbol which is
CONFIG_KVM_BOOK3S_64_HV_MODULE.

Fixes: 64a1b95bb9fe ("genirq: Restrict export of irq_to_desc()")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 7bb5226
Raw File
driver.rst 
=============
PCMCIA Driver
=============

sysfs
-----

New PCMCIA IDs may be added to a device driver pcmcia_device_id table at
runtime as shown below::

  echo "match_flags manf_id card_id func_id function device_no \
  prod_id_hash[0] prod_id_hash[1] prod_id_hash[2] prod_id_hash[3]" > \
  /sys/bus/pcmcia/drivers/{driver}/new_id

All fields are passed in as hexadecimal values (no leading 0x).
The meaning is described in the PCMCIA specification, the match_flags is
a bitwise or-ed combination from PCMCIA_DEV_ID_MATCH_* constants
defined in include/linux/mod_devicetable.h.

Once added, the driver probe routine will be invoked for any unclaimed
PCMCIA device listed in its (newly updated) pcmcia_device_id list.

A common use-case is to add a new device according to the manufacturer ID
and the card ID (form the manf_id and card_id file in the device tree).
For this, just use::

  echo "0x3 manf_id card_id 0 0 0 0 0 0 0" > \
    /sys/bus/pcmcia/drivers/{driver}/new_id

after loading the driver.
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