On 05/30/16 03:09, Max Gurtovoy wrote:
ib_device_cap_flags 64-bit expansion caused a possible caps overlapping
(depending on machine endianness) and made consumers read wrong device
capabilities. For example IB_DEVICE_SG_GAPS_REG was falsely read by the
iser driver causing it to use a non-existing capability. Fix this by
casting ib_device_cap_flags enumerations to ULL.
> [ ... ]
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
[ ... ]
enum ib_device_cap_flags {
> [ ... ]
IB_DEVICE_SG_GAPS_REG = (1ULL << 32),
[ ... ]
};
How can this patch make a difference? The presence of any constant in an
enum that does not fit in a 32-bit integer makes an enum 64 bits wide.
In other words, all the changes from "1" into "1ULL" in this patch do
not have any effect. From the C standard: "Each enumerated type shall be
compatible with char, a signed integer type, or an unsigned integer
type. The choice of type is implementation-defined but shall be capable
of representing the values of all the members of the enumeration. [...]
An implementation may delay the choice of which integer type until all
enumeration constants have been seen."
Bart.
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