[ewg] error with RHEL 5.3 backports in 1.4.1-rc2

[Brian J. Murrell]

I'm trying to build Lustre with OFED 1.4.1-rc2 and RHEL5.3's
2.6.18-128.1.1.el5 kernel and getting the following error:

  gcc
-Wp,-MD,/mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/llite/.lloop.o.d  -nostdinc -isystem /usr/lib/gcc/i486-linux-gnu/4.3.2/include -D__KERNEL__ -I/mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/foo -I/usr/src/ofa_kernel/kernel_addons/backport/2.6.18-EL5.3/include/ -I/usr/src/ofa_kernel/include  -Iinclude  -include include/linux/autoconf.h  -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Wstrict-prototypes -Wundef -Werror-implicit-function-declaration -Os -pipe -msoft-float -fno-builtin-sprintf -fno-builtin-log2 -fno-builtin-puts  -mpreferred-stack-boundary=2  -march=i686 -mtune=generic -mtune=generic -mregparm=3 -ffreestanding -Iinclude/asm-i386/mach-generic -Iinclude/asm-i386/mach-default -fomit-frame-pointer -g  -fno-stack-protector -Wdeclaration-after-statement -Wno-pointer-sign  -include /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/config.h  -g -I/mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lnet/include -I/mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lnet/include -I/mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/include  -g -O2 -I/opt/mpich/include   -DMODULE -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(lloop)"  -D"KBUILD_MODNAME=KBUILD_STR(llite_lloop)" -c -o /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/llite/.tmp_lloop.o /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/llite/lloop.c
In file included
from /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/include/linux/lustre_compat25.h:337,

from /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/include/linux/lvfs.h:49,

from /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/include/lvfs.h:48,

from /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/include/obd_support.h:41,

from /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/include/lustre_cfg.h:211,

from /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/include/lustre_lib.h:47,

from /mnt/lustre/brian/lustre/OFED-1.4.1-rc2/build/b1_8/lustre/llite/lloop.c:111:
include/linux/mpage.h:45: error: conflicting types for
‘backport_write_cache_pages’
/usr/src/ofa_kernel/kernel_addons/backport/2.6.18-EL5.3/include/linux/writeback.h:10: error: previous declaration of ‘backport_write_cache_pages’ was here

Looks like there is some conflict in the re-definition of
write_cache_pages() in the backport?

My kernel's mpage.h is defining it as:

int
write_cache_pages(struct address_space *mapping, int range_cont,
                struct writeback_control *wbc, writepage_data_t writepage,
                void *data);

Shall I file a bug on this?  Any thoughts on how to resolve?

b.

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