xen/events/fifo: correctly align bitops

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commit 05a812ac47 upstream.

FIFO event channels require bitops on 32-bit aligned values (the event
words).  Linux's bitops require unsigned long alignment which may be
64-bits.

On arm64 an incorrectly unaligned access will fault.

Fix this by aligning the bitops along with an adjustment for bit
position and using an unsigned long for the local copy of the ready
word.

Signed-off-by: Vladimir Murzin <murzin.v@gmail.com>
Tested-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Reviewed-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Vladimir Murzin 2014-04-27 10:09:12 +01:00 • committed by Greg Kroah-Hartman

parent 540299d7c8

commit f45babbd21

1 changed files with 30 additions and 11 deletions

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drivers/xen/events/events_fifo.c

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