I have fresh kernel downloaded by git and I want to know how to build
Documentation/DocBook/ as pdf I have tried
make pdfdocs >output
but I got those warnings
Warning(.//include/linux/init.h): no structured comments found
Warning(.//kernel/sys.c): no structured comments found
Warning(.//drivers/dma-buf/seqno-fence.c): no structured comments found
Warning(.//drivers/dma-buf/reservation.c): no structured comments found
Warning(.//include/linux/reservation.h): no structured comments found
Warning(.//include/linux/hsi/hsi.h:150): Excess
struct/union/enum/typedef member 'e_handler' description in
'hsi_client'
Warning(.//include/linux/hsi/hsi.h:150): Excess
struct/union/enum/typedef member 'pclaimed' description in
'hsi_client'
Warning(.//include/linux/hsi/hsi.h:150): Excess
struct/union/enum/typedef member 'nb' description in 'hsi_client'
make[1]: *** [Documentation/DocBook/kernel-hacking.pdf] Error 9
make: *** [pdfdocs] Error 2

and the file output look like this