[dpdk-dev] [PATCH] kni: fix use of undefined comma variable in makefile
Ferruh Yigit
ferruh.yigit at intel.com
Tue May 31 15:35:56 CEST 2016
On 5/30/2016 5:46 PM, Ferruh Yigit wrote:
> On 5/30/2016 5:21 PM, Olivier Matz wrote:
>> Hi Ferruh,
>>
>> On 05/30/2016 05:49 PM, Ferruh Yigit wrote:
>>> On 5/30/2016 12:56 PM, Olivier Matz wrote:
>>>> The $(comma) variable is not defined in this Makefile, nor in
>>>> any included Makefile. Seen while doing a "make clean" on ubuntu:
>>>>
>>>> $ make clean
>>>> == Clean lib
>>>> == Clean lib/librte_compat
>>>> == Clean lib/librte_eal
>>>> == Clean lib/librte_eal/common
>>>> == Clean lib/librte_eal/linuxapp
>>>> == Clean lib/librte_eal/linuxapp/eal
>>>> == Clean lib/librte_eal/linuxapp/igb_uio
>>>> == Clean lib/librte_eal/linuxapp/kni
>>>> tr: missing operand after ‘.-’
>>>> Two strings must be given when translating.
>>>> Try 'tr --help' for more information.
>>>
>>> I don't observe this error on Ubuntu.
>>>
>>> Also did a quick check and $(comma) seems defined, but not sure exactly
>>> where. What I test:
>>>
>>> $ lsb_release -si
>>> Ubuntu
>>>
>>>
>>> $ git diff
>>> diff --git a/lib/librte_eal/linuxapp/kni/Makefile
>>> b/lib/librte_eal/linuxapp/kni/Makefile
>>> index ac99d3f..dcad241 100644
>>> --- a/lib/librte_eal/linuxapp/kni/Makefile
>>> +++ b/lib/librte_eal/linuxapp/kni/Makefile
>>> @@ -90,4 +90,7 @@ SRCS-y += kni_net.c
>>> SRCS-y += kni_ethtool.c
>>> SRCS-$(CONFIG_RTE_KNI_VHOST) += kni_vhost.c
>>>
>>> +test_comma:
>>> + @echo "= comma: $(comma) ="
>>> +
>>>
>>>
>>>
>>> $ make -C lib/librte_eal/linuxapp/kni test_comma
>>> make: Entering directory '.../dpdk/lib/librte_eal/linuxapp/kni'
>>> = comma: , =
>>> make: Leaving directory '.../dpdk/lib/librte_eal/linuxapp/kni'
>>
>> Thanks for testing and review.
>> I added the following lines to the makefile (just after the include
>> rte.vars.mk):
>>
>> $(info ------------------)
>> $(info comma=$(comma))
>> $(info $(origin comma))
>>
>> And it gives me:
>>
>> $ make clean
>> == Clean lib/librte_eal/linuxapp/kni
>> --------------------
>> comma=,
>> file
>> make -C /lib/modules/3.13.0-79-generic/build
>> M=/home/user/dpdk.org/build/build/lib/librte_eal/linuxapp/kni
>> O=/lib/modules/3.13.0-79-generic/build clean
>> make -C /usr/src/linux-headers-3.13.0-79-generic \
>> KBUILD_SRC=/usr/src/linux-headers-3.13.0-79-generic \
>>
>> KBUILD_EXTMOD="/home/user/dpdk.org/build/build/lib/librte_eal/linuxapp/kni"
>> -f /usr/src/linux-headers-3.13.0-79-generic/Makefile \
>> clean
>> make -f /usr/src/linux-headers-3.13.0-79-generic/scripts/Makefile.clean
>> obj=/home/user/dpdk.org/build/build/lib/librte_eal/linuxapp/kni
>> --------------------
>> comma=
>> undefined
>> tr: missing operand after ‘.-’
>> Two strings must be given when translating.
>> Try 'tr --help' for more information.
>> [...]
>>
>> Actually this Makefile is used twice, and second time the $(comma)
>> variable is not defined.
>>
>> It seems the $(comma) variable is defined in rte.cpuflags.mk when
>> including rte.vars.mk:
>>
>> mk/rte.vars.mk
>> mk/target/generic/rte.vars.mk
>> mk/rte.cpuflags.mk (only if KERNELRELEASE is unset, which is
>> not the case for the second call)
>>
>>
>> Do you see the issue when you do a "make clean"?
>>
>
> No issue on "make clean".
>
> I did same modification as you did, for me comma defined for both times,
> a system variable can be triggering the behavior perhaps.
>
> What I got with "make clean" is:
>
> ...
> == Clean lib/librte_eal/linuxapp/kni
> ------------
> comma=,
> file
> make -C /lib/modules/4.4.0-22-generic/build
> M=/home/ferruhy/development/dpdk/build/build/lib/librte_eal/linuxapp/kni
> O=/lib/modules/4.4.0-22-generic/build clean
> make -C /usr/src/linux-headers-4.4.0-22-generic
> KBUILD_SRC=/usr/src/linux-headers-4.4.0-22-generic \
> -f /usr/src/linux-headers-4.4.0-22-generic/Makefile clean
> make -f /usr/src/linux-headers-4.4.0-22-generic/scripts/Makefile.clean
> obj=/home/ferruhy/development/dpdk/build/build/lib/librte_eal/linuxapp/kni
> ------------
> comma=,
> file
> rm -rf
> /home/ferruhy/development/dpdk/build/build/lib/librte_eal/linuxapp/kni/.tmp_versions
> rm -f
> /home/ferruhy/development/dpdk/build/build/lib/librte_eal/linuxapp/kni/Module.symvers
> == Clean lib/librte_eal/linuxapp/xen_dom0
> ...
>
Error is related to the kernel version, in second call "comma"
definition comes from kernel makefiles.
Following commit causes comma to be defined:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=371fdc77af44f4cb32475fd499e1d912ccc30890
So this is valid issue for old kernels, and using "," directly looks OK.
> Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
Acked-by Ferruh Yigit <ferruh.yigit at intel.com>
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