freebsd-dev/config/kernel-blk-fetch-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 blk_fetch_request()
dnl # function replaces the elv_next_request() and blk_fetch_request()
dnl # functions. The updated blk_fetch_request() function returns the
dnl # next available request and removed it from the request queue.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_FETCH_REQUEST], [
AC_MSG_CHECKING([whether blk_fetch_request() is available])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
],[
struct request_queue *q = NULL;
(void) blk_fetch_request(q);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLK_FETCH_REQUEST, 1,
[blk_fetch_request() is available])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])