Check that a PCI device's memory size is power of two
According to the PCI local bus specification [1], a device's memory size
must be a power of two. This is also implicit in the mechanism that a CPU
uses to get the memory size requirement for a PCI device.
The vesa device requests a memory size that isn't a power of two.
According to the same spec [1], a device is allowed to consume more memory
than it actually requires. As a result, the amount of memory that the vesa
device now reserves has been increased.
To prevent slip-ups in the future, a few BUILD_BUG_ON statements were added
in places where the memory size is known at compile time.
[1] PCI Local Bus Specification Revision 3.0, section 6.2.5.1
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 files changed
