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

[mathieu.desnoyers@efficios.com (Mathieu Desnoyers)]

You might want to request help from Cavium, since they are the one supporting 
their toolchain. 

It really seems to be a Cavium-specific issue. 

Thanks, 

Mathieu 

----- Original Message -----

> From: "kumar s" <skumar.m226@gmail.com>
> To: "Mathieu Desnoyers" <mathieu.desnoyers at efficios.com>
> Cc: lttng-dev at lists.lttng.org
> Sent: Tuesday, February 4, 2014 5:13:44 AM
> Subject: Re: [lttng-dev] lib_ring_buffer_align error bit-field '<anonymous>'
> width not an integer constant

> 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
> 

-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 
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