608f8749a1
Reduce the time required for ./configure to perform the needed
KABI checks by allowing kbuild to compile multiple test cases in
parallel. This was accomplished by splitting each test's source
code from the logic handling whether that code could be compiled
or not.
By introducing this split it's possible to minimize the number of
times kbuild needs to be invoked. As importantly, it means all of
the tests can be built in parallel. This does require a little extra
care since we expect some tests to fail, so the --keep-going (-k)
option must be provided otherwise some tests may not get compiled.
Furthermore, since a failure during the kbuild modpost phase will
result in an early exit; the final linking phase is limited to tests
which passed the initial compilation and produced an object file.
Once everything has been built the configure script proceeds as
previously. The only significant difference is that it now merely
needs to test for the existence of a .ko file to determine the
result of a given test. This vastly speeds up the entire process.
New test cases should use ZFS_LINUX_TEST_SRC to declare their test
source code and ZFS_LINUX_TEST_RESULT to check the result. All of
the existing kernel-*.m4 files have been updated accordingly, see
config/kernel-current-time.m4 for a basic example. The legacy
ZFS_LINUX_TRY_COMPILE macro has been kept to handle special cases
but it's use is not encouraged.
master (secs) patched (secs)
------------- ----------------
autogen.sh 61 68
configure 137 24 (~17% of current run time)
make -j $(nproc) 44 44
make rpms 287 150
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8547
Closes #9132
Closes #9341
70 lines
2.1 KiB
Plaintext
70 lines
2.1 KiB
Plaintext
dnl #
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dnl # 2.6.36 API change
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dnl # In 2.6.36 kernels the blk_queue_ordered() interface has been
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dnl # replaced by the simpler blk_queue_flush(). However, while the
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dnl # old interface was available to all the new one is GPL-only.
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dnl # Thus in addition to detecting if this function is available
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dnl # we determine if it is GPL-only. If the GPL-only interface is
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dnl # there we implement our own compatibility function, otherwise
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dnl # we use the function. The hope is that long term this function
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dnl # will be opened up.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_FLUSH], [
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ZFS_LINUX_TEST_SRC([blk_queue_flush], [
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#include <linux/blkdev.h>
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], [
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struct request_queue *q = NULL;
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(void) blk_queue_flush(q, REQ_FLUSH);
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], [$NO_UNUSED_BUT_SET_VARIABLE], [$ZFS_META_LICENSE])
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ZFS_LINUX_TEST_SRC([blk_queue_write_cache], [
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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], [
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struct request_queue *q = NULL;
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blk_queue_write_cache(q, true, true);
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], [$NO_UNUSED_BUT_SET_VARIABLE], [$ZFS_META_LICENSE])
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])
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AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLUSH], [
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AC_MSG_CHECKING([whether blk_queue_flush() is available])
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ZFS_LINUX_TEST_RESULT([blk_queue_flush], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_FLUSH, 1,
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[blk_queue_flush() is available])
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AC_MSG_CHECKING([whether blk_queue_flush() is GPL-only])
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ZFS_LINUX_TEST_RESULT([blk_queue_flush_license], [
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AC_MSG_RESULT(no)
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY, 1,
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[blk_queue_flush() is GPL-only])
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])
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],[
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AC_MSG_RESULT(no)
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])
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dnl #
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dnl # 4.7 API change
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dnl # Replace blk_queue_flush with blk_queue_write_cache
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dnl #
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AC_MSG_CHECKING([whether blk_queue_write_cache() exists])
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ZFS_LINUX_TEST_RESULT([blk_queue_write_cache], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_WRITE_CACHE, 1,
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[blk_queue_write_cache() exists])
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AC_MSG_CHECKING([whether blk_queue_write_cache() is GPL-only])
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ZFS_LINUX_TEST_RESULT([blk_queue_write_cache_license], [
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AC_MSG_RESULT(no)
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_WRITE_CACHE_GPL_ONLY, 1,
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[blk_queue_write_cache() is GPL-only])
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])
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],[
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AC_MSG_RESULT(no)
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])
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])
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