Compilation of PREEMPT_RT on PowerPC (ppc440)

[srikanth krishnakar]

Hi all,

The latest RT patch "patch-2.6.29-rc6-rt3" is throwing following compilation
errors for POWERPC  linux kernel 2.6.29-rc6 :-

As I used plain vanilla kernel i.e ->  Linux-2.6.28 + patch-2.6.29-rc6 +
patch-2.6.29-rc6-rt3

While compiling for ppc440...

[root at srikanth linux-2.6.29-rc6]# make ARCH=powerpc CROSS_COMPILE=ppc_440-
zImage
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  SYMLINK include/asm -> include/asm-powerpc
  CC      kernel/bounds.s
  GEN     include/linux/bounds.h
  CC      arch/powerpc/kernel/asm-offsets.s
In file included from include/linux/rwsem.h:37,
                 from include/linux/mm_types.h:11,
                 from include/linux/sched.h:61,
                 from arch/powerpc/kernel/asm-offsets.c:17:
/opt/mlg-rt-test/linux-2.6.29-rc6/arch/powerpc/include/asm/rwsem.h:24:
error: redefinition of ‘struct rw_semaphore’
In file included from
include/linux/rwsem.h:37,

                 from
include/linux/mm_types.h:11,

                 from
include/linux/sched.h:61,

                 from
arch/powerpc/kernel/asm-offsets.c:17:

/opt/mlg-rt-test/linux-2.6.29-rc6/arch/powerpc/include/asm/rwsem.h:46:1:
warning: "__RWSEM_INITIALIZER" redefined
In file included from
include/linux/spinlock.h:118,

                 from
include/linux/seqlock.h:34,

                 from include/linux/time.h:8,
                 from include/linux/timex.h:56,
                 from include/linux/sched.h:54,
                 from arch/powerpc/kernel/asm-offsets.c:17:
include/linux/rt_lock.h:191:1: warning: this is the location of the previous
definition
In file included from include/linux/rwsem.h:37,
                 from include/linux/mm_types.h:11,
                 from include/linux/sched.h:61,
                 from arch/powerpc/kernel/asm-offsets.c:17:
/opt/mlg-rt-test/linux-2.6.29-rc6/arch/powerpc/include/asm/rwsem.h:50:1:
warning: "DECLARE_RWSEM" redefined
In file included from include/linux/spinlock.h:118,
                 from include/linux/seqlock.h:34,
                 from include/linux/time.h:8,
                 from include/linux/timex.h:56,
                 from include/linux/sched.h:54,
                 from arch/powerpc/kernel/asm-offsets.c:17:
include/linux/rt_lock.h:195:1: warning: this is the location of the previous
definition
In file included from include/linux/rwsem.h:37,
                 from include/linux/mm_types.h:11,
                 from include/linux/sched.h:61,
                 from arch/powerpc/kernel/asm-offsets.c:17:
/opt/mlg-rt-test/linux-2.6.29-rc6/arch/powerpc/include/asm/rwsem.h:61:1:
warning: "init_rwsem" redefined
In file included from include/linux/spinlock.h:118,
                 from include/linux/seqlock.h:34,
                 from include/linux/time.h:8,
                 from include/linux/timex.h:56,
                 from include/linux/sched.h:54,
                 from arch/powerpc/kernel/asm-offsets.c:17:
include/linux/rt_lock.h:232:1: warning: this is the location of the previous
definition
/opt/mlg-rt-test/linux-2.6.29-rc6/arch/powerpc/include/asm/rwsem.h:167:
error: expected identifier or ‘(’ before ‘{’ token
make[1]: *** [arch/powerpc/kernel/asm-offsets.s] Error 1
make: *** [prepare0] Error 2
[root at srikanth linux-2.6.29-rc6]#

Has anybody come across this ? If any fixes brought up for build of RT on
PowerPC, pls reply back.


Regards
Srikant
********
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