[lttng-dev] lib_ring_buffer_align error bit-field '<anonymous>' width not an integer constant

[skumar.m226@gmail.com (kumar s)]

Hi,

The lttng module i use is the latest version, compiler toolchain cannot be
upgraded since it is provided by Cavium, kernel version is 2.6.32.27.

Is there any change i need to do on lttng modules to build it?

Thank you
SKumar


On Mon, Feb 3, 2014 at 9:20 PM, Mathieu Desnoyers <
mathieu.desnoyers at efficios.com> wrote:

> ------------------------------
>
> *From: *"kumar s" <skumar.m226@gmail.com>
> *To: *lttng-dev at lists.lttng.org
> *Sent: *Tuesday, December 3, 2013 3:20:02 AM
> *Subject: *[lttng-dev] lib_ring_buffer_align error bit-field
> '<anonymous>' width not an integer constant
>
>
> Hello,
>
> When trying to build lttng modules i am getting this error. Cross compiler
> for mips and Arch = mips is used in makefile.
>
> Linux kernel version 2.6.32.27
>
>
> make -C
> /home/shkumar/Development_Merge/NewOCT/OCTEON_SDK/octeon_sdk/OCTEON-SDK/linux/kernel_2.6/linux
> M=/home/shkumar/lttng-tools/lttngmod/lttng-modules modules ARCH=mips
> CROSS_COMPILE=mips64-octeon-linux-gnu-
> make[1]: Entering directory
> `/home/shkumar/Development_Merge/NewOCT/OCTEON_SDK/octeon_sdk/OCTEON-SDK/linux/kernel_2.6/linux'
>   CC [M]
>  /home/shkumar/lttng-tools/lttngmod/lttng-modules/lttng-ring-buffer-client-discard.o
> In file included from
> /home/shkumar/lttng-tools/lttngmod/lttng-modules/wrapper/ringbuffer/config.h:1,
>                  from
> /home/shkumar/lttng-tools/lttngmod/lttng-modules/lttng-tracer-core.h:35,
>                  from
> /home/shkumar/lttng-tools/lttngmod/lttng-modules/lttng-tracer.h:39,
>                  from
> /home/shkumar/lttng-tools/lttngmod/lttng-modules/lttng-ring-buffer-client-discard.c:24:
> /home/shkumar/lttng-tools/lttngmod/lttng-modules/wrapper/ringbuffer/../../lib/ringbuffer/config.h:
> In function 'lib_ring_buffer_align':
> /home/shkumar/lttng-tools/lttngmod/lttng-modules/wrapper/ringbuffer/../../lib/ringbuffer/config.h:266:
> error: bit-field '<anonymous>' width not an integer constant
> make[2]: ***
> [/home/shkumar/lttng-tools/lttngmod/lttng-modules/lttng-ring-buffer-client-discard.o]
> Error 1
> make[1]: *** [_module_/home/shkumar/lttng-tools/lttngmod/lttng-modules]
> Error 2
> make[1]: Leaving directory
> `/home/shkumar/Development_Merge/NewOCT/OCTEON_SDK/octeon_sdk/OCTEON-SDK/linux/kernel_2.6/linux'
> make: *** [default] Error 2
>
> How do i fix this?
>
>
> This is caused by the use of offset_align(), passing incorrect parameters,
> detected by the compiler:
>
> see lttng-modules
>
> lib/align.h:
>
> #define offset_align(align_drift,
> alignment)                                   \
>
> ({                                                                     \
>                 BUILD_RUNTIME_BUG_ON((alignment) ==
> 0                          \
>                                    || ((alignment) & ((alignment) -
> 1)));      \
>                 (((alignment) - (align_drift)) & ((alignment) -
> 1));           \
>         })
>
> See also lttng-modules
> lib/bug.h
>
> So there are two things that are possible: either the compiler you use
> does not perform the
> optimisations that are expected, and therefore triggers the BUILD_BUG_ON()
> without needing to,
> or there really is an incorrect value passed to offset_align().
>
> Make sure lttng-modules, your compiler toolchain, and your kernel are up
> to date.
>
> Thanks,
>
> Mathieu
>
>
> Skumar.
>
> _______________________________________________
> lttng-dev mailing list
> lttng-dev at lists.lttng.org
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>
>
>
>
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com
>
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