[SCSI] scsi_dh: fix kconfig related build errors
Do not automatically "select" SCSI_DH for dm-multipath. If SCSI_DH doesn't exist,just do not allow hardware handlers to be used. Handle SCSI_DH being a module also. Make sure it doesn't allow DM_MULTIPATH to be compiled in when SCSI_DH is a module. [jejb: added comment for Kconfig syntax] Signed-off-by: NChandra Seetharaman <sekharan@us.ibm.com> Reported-by: NRandy Dunlap <randy.dunlap@oracle.com> Reported-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>
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