compile nvme 4.13 appear error

[Tony Yang]

Dear All

  I at redhat 6.5 ,kernel is 2.6.32-431.el6.x86_64，I comile nvme 4.13
appear this error:

[root at cescel03 nvme-nvme-4.13]# make
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CHK     include/generated/bounds.h
  CHK     include/generated/timeconst.h
  CHK     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  CHK     scripts/mod/devicetable-offsets.h
  CHK     include/generated/compile.h
  AR      drivers/nvme/host/built-in.o
  CC [M]  drivers/nvme/host/core.o
drivers/nvme/host/core.c: In function ‘nvme_alloc_mpath_ns’:
drivers/nvme/host/core.c:3111: error: ‘NVME_FAILOVER_RETRIES’
undeclared (first use in this function)
drivers/nvme/host/core.c:3111: error: (Each undeclared identifier is
reported only once
drivers/nvme/host/core.c:3111: error: for each function it appears in.)
drivers/nvme/host/core.c: In function ‘nvme_trigger_failover’:
drivers/nvme/host/core.c:3277: error: ‘NVME_FAILOVER_RETRIES’
undeclared (first use in this function)
make[3]: *** [drivers/nvme/host/core.o] Error 1
make[2]: *** [drivers/nvme/host] Error 2
make[1]: *** [drivers/nvme] Error 2
make: *** [drivers] Error 2
[root at cescel03 nvme-nvme-4.13]#

Could you tell me how to solve this problem?Thanks