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The pm8001 driver does not compile if PM8001_USE_MSIX is not defined in
pm8001_sas.h because various fields and functions conditionally defined are
used unconditionally without a "#ifdef PM8001_USE_MSIX" protection.  This
macro is rather useless anyway and not convenient as diabling MSI-X use
requires recompiling the driver.

Remove this macro and replace it with the bool module parameter "use_msix"
which defaults to true. The use of MSI-X interrupts for an adapter is gated
by this module parameter for adapters that actually support MSI-X. The
"use_msix" boolean field is added to struct pm8001_hba_info and all code
defined depending on PM8001_USE_MSIX is modified to rely on
pm8001_hba_info->use_msix instead.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20230911232745.325149-9-dlemoal@kernel.org

Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>