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SubjectQuestion on FIELD_PREP() for static array
Date
(to: get_maintainers -f include/linux/bitfield.h)

Hi,

I would like to use FIELD_PREP() macro for assigning a static array,
like this:
function()
{
static u32 val[2] = {FIELD_PREP(GENMASK_ULL(10, 0), 5), 0};

}

However the compiler complains of non-const expression:
./include/linux/bitfield.h:88:2: error: initializer element is not constant
({ \

Specifically it doesn't like the __BF_FIELD_CHECK() in FIELD_PREP().

Any ideas on compiler trickery we could do with the FIELD_PREP()
definition to avoid this issue (i.e. enforce the check but only use the
constant value)?

Thanks in advance,
John

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