mirror_zfs/config/kernel-blk-requeue-request.m4
Prakash Surya b9c59ec83a Fix configure tests to play nice with GCC 4.6
As of GCC 4.6, specific kernel 2.6.32 header files do not compile
cleanly without warnings. One specific example of this is the
arch/x86/include/asm/percpu.h file. Thus, a few of the configure tests
were getting hung up on this and the '-Wno-unsued-but-set-variables'
compile option had to be introduced.

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #459
2011-11-29 16:14:25 -08:00

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dnl #
dnl # 2.6.31 API change
dnl # Request queue peek/retrieval interface cleanup, the
dnl # elv_requeue_request() function has been replaced with the
dnl # blk_requeue_request() function.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST], [
AC_MSG_CHECKING([whether blk_requeue_request() is available])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
],[
struct request_queue *q = NULL;
struct request *req = NULL;
blk_requeue_request(q, req);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLK_REQUEUE_REQUEST, 1,
[blk_requeue_request() is available])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])