errors compiling bcachefs-tools v1.20.0 on debian 12

["John Stoffel" <john@stoffel.org>]

Hi guys,
I'm trying to upgrade the bcachefs tools since I tend to use newer
kernels on my Debian 12 system.  The debian packages bcachefs-tools
are ancient.  

So I cloned the repo, installed the pre-reqs and I'm trying to compile
it, but I get the following:


quad:/bcachefs/bcachefs1/bcachefs-tools$ make
    [CC]     c_src/bcachefs.o
In file included from ./libbcachefs/bcachefs.h:202,
                 from c_src/tools-util.h:21,
                 from c_src/cmds.h:10,
                 from c_src/bcachefs.c:26:
include/linux/srcu.h:10:41: error: return type is an incomplete type
   10 | static inline struct urcu_gp_poll_state get_state_synchronize_rcu()
      |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/srcu.h: In function ‘get_state_synchronize_rcu’:
include/linux/srcu.h:12:16: warning: implicit declaration of function ‘start_poll_synchronize_rcu’ ]
   12 |         return start_poll_synchronize_rcu();
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/srcu.h:12:16: warning: ‘return’ with a value, in function returning void [-Wreturn-ty]
   12 |         return start_poll_synchronize_rcu();
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/srcu.h:10:41: note: declared here
   10 | static inline struct urcu_gp_poll_state get_state_synchronize_rcu()
      |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/srcu.h: At top level:
include/linux/srcu.h:25:99: error: parameter 2 (‘cookie’) has incomplete type
   25 | bool poll_state_synchronize_srcu(struct srcu_struct *ssp, struct urcu_gp_poll_state cookie)
      |                                                           ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~

include/linux/srcu.h: In function ‘poll_state_synchronize_srcu’:
include/linux/srcu.h:27:16: warning: implicit declaration of function ‘poll_state_synchronize_rcu’;]
   27 |         return poll_state_synchronize_rcu(cookie);
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                poll_state_synchronize_srcu
include/linux/srcu.h: At top level:
include/linux/srcu.h:30:41: error: return type is an incomplete type
   30 | static inline struct urcu_gp_poll_state start_poll_synchronize_srcu(struct srcu_struct *ssp)
      |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/srcu.h: In function ‘start_poll_synchronize_srcu’:
include/linux/srcu.h:32:16: warning: ‘return’ with a value, in function returning void [-Wreturn-ty]
   32 |         return start_poll_synchronize_rcu();
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/srcu.h:30:41: note: declared here
   30 | static inline struct urcu_gp_poll_state start_poll_synchronize_srcu(struct srcu_struct *ssp)
      |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/srcu.h: At top level:
include/linux/srcu.h:35:41: error: return type is an incomplete type
   35 | static inline struct urcu_gp_poll_state get_state_synchronize_srcu(struct srcu_struct *ssp)
      |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~
make: *** [Makefile:171: c_src/bcachefs.o] Error 1
quad:/bcachefs/bcachefs1/bcachefs-tools$ git branch
  master  * v1.20.0