compile error for 5.15.4

[Toralf Förster]

Hi,

got this at a hardened stable Gentoo Server:

# uname -a
Linux mr-fox 5.14.17 #1 SMP Thu Nov 18 14:02:58 CET 2021 x86_64 AMD
Ryzen 9 5950X 16-Core Processor AuthenticAMD GNU/Linux


  CC      net/ipv4/tcp_timer.o
  CC      lib/raid6/sse1.o
drivers/dma/ptdma/ptdma-debugfs.c: In function ‘ptdma_debugfs_setup’:
drivers/dma/ptdma/ptdma-debugfs.c:93:54: error: ‘struct dma_device’ has
no member named ‘dbg_dev_root’
   93 |         debugfs_create_file("info", 0400,
pt->dma_dev.dbg_dev_root, pt,
      |                                                      ^
drivers/dma/ptdma/ptdma-debugfs.c:96:55: error: ‘struct dma_device’ has
no member named ‘dbg_dev_root’
   96 |         debugfs_create_file("stats", 0400,
pt->dma_dev.dbg_dev_root, pt,
      |                                                       ^
drivers/dma/ptdma/ptdma-debugfs.c:102:52: error: ‘struct dma_device’ has
no member named ‘dbg_dev_root’
  102 |                 debugfs_create_dir("q", pt->dma_dev.dbg_dev_root);
      |                                                    ^
make[3]: *** [scripts/Makefile.build:277:
drivers/dma/ptdma/ptdma-debugfs.o] Error 1
make[2]: *** [scripts/Makefile.build:540: drivers/dma/ptdma] Error 2
make[1]: *** [scripts/Makefile.build:540: drivers/dma] Error 2
make[1]: *** Waiting for unfinished jobs....
  CC      mm/usercopy.o
  CC      lib/argv_split.o

--
Toralf