[LU-6053] Review #12531 (LU-4604) failed to compile in lustre 2.4.3

Related — Mon, 5 Jan 2015 18:32:44 +0000

One of our sles11sp3 production clients panicked with signature of ~~LU-4445~~.
~~LU-4445~~ was merged to ~~LU-4604~~. The patch of master branch (#8694) was ported to b2_5 (#12531).

The patch of #12531 was cherry-picked into our nas-2.4.3 branch cleanly. However, compilation failed:

=== start quote ====
...
Making all in posix
make[6]: Entering directory `/usr/src/packages/BUILD/lustre-2.4.3/libcfs/libcfs'
In file included from /usr/src/packages/BUILD/lustre-2.4.3/lustre/include/lustre_net.h:77,
from /usr/src/packages/BUILD/lustre-2.4.3/lustre/include/lustre_lib.h:70,
from /usr/src/packages/BUILD/lustre-2.4.3/lustre/include/liblustre.h:503,
from fail.c:38:
/usr/src/packages/BUILD/lustre-2.4.3/lustre/include/lu_object.h:336: error: expected specifier-qualifier-list before 'atomic_t'
=== end quote ===

The libcfs/libcfs/fail.c determines which header files to include here:
#ifndef _KERNEL_
#include <liblustre.h>
#else
#include <libcfs/libcfs.h>
#endif

Since <liblustre.h> was included, apparently _KERNEL_ was not defined. However, type 'atomic_t' is defined in <linux/types.h> only if _KERNEL_ defined.

I do not know what changes were made in b2_5 to make it able to compile, it failed to compile in my 2.4.3 environment.

Whamcloud Community JIRA

[LU-6053] Review #12531 (LU-4604) failed to compile in lustre 2.4.3