linux-kernel - kernel v5.9-rc6 not compiling

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Date:   Sun, 20 Sep 2020 22:37:44 -0600
From:   bob <gillb4@...usplanet.net>
To:     linux-kernel@...r.kernel.org
Subject: kernel v5.9-rc6 not compiling

Hi.  I've been building kernels weekly since 1996.  Never had one not 
build before today.  v5.9-rc6 does not compile.

Error:

   AR      drivers/gpu/built-in.a
make: *** [Makefile:1784: drivers] Error 2
   CALL    scripts/checksyscalls.sh
   CALL    scripts/atomic/check-atomics.sh
   DESCEND  objtool
   CHK     include/generated/compile.h
   CC      drivers/dax/super.o
drivers/dax/super.c:325:6: error: redefinition of ‘dax_supported’
   325 | bool dax_supported(struct dax_device *dax_dev, struct 
block_device *bdev,
       |      ^~~~~~~~~~~~~
In file included from drivers/dax/super.c:16:
./include/linux/dax.h:162:20: note: previous definition of 
‘dax_supported’ was here
   162 | static inline bool dax_supported(struct dax_device *dax_dev,
       |                    ^~~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:283: drivers/dax/super.o] Error 1
make[1]: *** [scripts/Makefile.build:500: drivers/dax] Error 2
make: *** [Makefile:1784: drivers] Error 2
sed: can't read modules.order: No such file or directory
make: *** [Makefile:1416: _modinst_] Error 2
sh ./arch/x86/boot/install.sh 5.9.0-rc6 arch/x86/boot/bzImage \
     System.map "/boot"

  *** Missing file: arch/x86/boot/bzImage
  *** You need to run "make" before "make install".

make[1]: *** [arch/x86/boot/Makefile:160: install] Error 1
make: *** [arch/x86/Makefile:274: install] Error 2
You may need to edit your /etc/default/grub file

... so its not like I'm stuck, I can pick any of a number of old kernels 
from the bootloader.  And I've had a lot of rc kernels over the years 
that would build, but weren't finished (occasionally I would get an oops 
in dmesg).  Again pick another kernel from the bootloader, preferrably a 
more stable non-rc one. But I don't think I've ever had a kernel not 
compile before.  I'm waiting for the nouveau drivers to firm up, but DAX 
is page cache for ext2/3/4 file systems (and I use ext4).  Hopefully my 
report is useful.  Thank you.