add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/block/Makefile
..
..
@@ -29,8 +29,6 @@
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 obj-$(CONFIG_BLK_DEV_CRYPTOLOOP) += cryptoloop.o
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 obj-$(CONFIG_VIRTIO_BLK)	+= virtio_blk.o
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-obj-$(CONFIG_BLK_DEV_SX8)	+= sx8.o
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-
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 obj-$(CONFIG_XEN_BLKDEV_FRONTEND)	+= xen-blkfront.o
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 obj-$(CONFIG_XEN_BLKDEV_BACKEND)	+= xen-blkback/
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 obj-$(CONFIG_BLK_DEV_DRBD)     += drbd/
..
..
@@ -41,12 +39,7 @@
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 obj-$(CONFIG_ZRAM) += zram/
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 obj-$(CONFIG_BLK_DEV_RNBD)	+= rnbd/
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-obj-$(CONFIG_BLK_DEV_NULL_BLK)	+= null_blk.o
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-null_blk-objs	:= null_blk_main.o
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-ifeq ($(CONFIG_BLK_DEV_ZONED), y)
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-null_blk-$(CONFIG_TRACING) += null_blk_trace.o
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-endif
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-null_blk-$(CONFIG_BLK_DEV_ZONED) += null_blk_zoned.o
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+obj-$(CONFIG_BLK_DEV_NULL_BLK)	+= null_blk/
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 skd-y		:= skd_main.o
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 swim_mod-y	:= swim.o swim_asm.o